[extensions] Deprecate old-style PepManager PEP listeners

This moves the logic in AbstractXMPPConnection.getSmackTlsContext()
into the ConnectionConfiguration constructor.

Also introduce SslContextFactory and use it in
ConnectionConfiguration.

.travis.yml

@@ -35,7 +35,16 @@ install: gradle assemble --stacktrace
 # functional. Which hasn't always be the case in the past, see
 # 90cbcaebc7a89f4f771f733a33ac9f389df85be2
 # Also run javadocAll to ensure it works.
-script: gradle check publishToMavenLocal javadocAll --stacktrace
+script:
+  - |
+    JAVAC_MAJOR_VERSION=$(javac -version | sed -E 's/javac ([[:digit:]]+).*/\1/')
+    GRADLE_TASKS=()
+    GRADLE_TASKS+=(check)
+    GRADLE_TASKS+=(publishToMavenLocal)
+    if [[ ${JAVAC_MAJOR_VERSION} -ge 11 ]]; then
+      GRADLE_TASKS+=(javadocAll)
+    fi
+    gradle ${GRADLE_TASKS[@]} --stacktrace
 
 after_success:
   - JAVAC_VERSION=$((javac -version) 2>&1)

build.gradle

@@ -122,10 +122,10 @@ allprojects {
 		// See also:
 		// - https://issues.apache.org/jira/browse/MNG-6232
 		// - https://issues.igniterealtime.org/browse/SMACK-858
-		jxmppVersion = '0.7.0-alpha5'
-		miniDnsVersion = '0.4.0-alpha3'
+		jxmppVersion = '0.7.0-alpha6'
+		miniDnsVersion = '0.4.0-alpha5'
 		smackMinAndroidSdk = 19
-		junitVersion = '5.6.0'
+		junitVersion = '5.6.2'
 		commonsIoVersion = '2.6'
 		bouncyCastleVersion = '1.65'
 
@@ -283,7 +283,7 @@ tasks.withType(Javadoc) {
 		testFixturesApi "org.mockito:mockito-core:3.3.3"
 		testImplementation 'com.jamesmurty.utils:java-xmlbuilder:1.2'
 
-		errorprone 'com.google.errorprone:error_prone_core:2.3.3'
+		errorprone 'com.google.errorprone:error_prone_core:2.3.4'
 		errorproneJavac('com.google.errorprone:javac:9+181-r4173-1')
 	}
 
@@ -409,7 +409,7 @@ subprojects {
 	apply plugin: 'org.kordamp.gradle.clirr'
 
 	checkstyle {
-		toolVersion = '8.22'
+		toolVersion = '8.27'
 	}
 	task sourcesJar(type: Jar, dependsOn: classes) {
 		classifier = 'sources'
@@ -441,7 +441,7 @@ subprojects {
 					packaging = 'jar'
 					inceptionYear = '2003'
 					url = 'http://www.igniterealtime.org/projects/smack/'
-					description project.description
+					description = project.description
 
 					issueManagement {
 						system = 'JIRA'

config/checkstyle/checkstyle.xml

@@ -104,13 +104,7 @@
 		</module>
 		<module name="JavadocMethod">
 			<!-- TODO stricten those checks -->
-			<property name="scope" value="public"/>
-			<property name="allowUndeclaredRTE" value="true"/>
-			<property name="allowMissingParamTags" value="true"/>
-			<property name="allowMissingThrowsTags" value="true"/>
-			<property name="allowMissingReturnTag" value="true"/>
-			<property name="allowMissingJavadoc" value="true"/>
-			<property name="suppressLoadErrors" value="true"/>
+			<property name="scope" value="protected"/>
 		</module>
 		<module name="JavadocStyle">
 			<property name="scope" value="public"/>

smack-core/src/main/java/org/jivesoftware/smack/AbstractXMPPConnection.java

@@ -16,24 +16,9 @@
  */
 package org.jivesoftware.smack;
 
-import java.io.ByteArrayInputStream;
-import java.io.FileInputStream;
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.Reader;
 import java.io.Writer;
-import java.lang.reflect.Constructor;
-import java.nio.charset.StandardCharsets;
-import java.security.KeyManagementException;
-import java.security.KeyStore;
-import java.security.KeyStoreException;
-import java.security.NoSuchAlgorithmException;
-import java.security.NoSuchProviderException;
-import java.security.Provider;
-import java.security.SecureRandom;
-import java.security.Security;
-import java.security.UnrecoverableKeyException;
-import java.security.cert.CertificateException;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Iterator;
@@ -56,18 +41,9 @@ import java.util.concurrent.locks.ReentrantLock;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
-import javax.net.ssl.KeyManager;
-import javax.net.ssl.KeyManagerFactory;
-import javax.net.ssl.SSLContext;
 import javax.net.ssl.SSLSession;
-import javax.net.ssl.TrustManager;
-import javax.net.ssl.X509TrustManager;
-import javax.security.auth.callback.Callback;
-import javax.security.auth.callback.CallbackHandler;
-import javax.security.auth.callback.PasswordCallback;
 import javax.xml.namespace.QName;
 
-import org.jivesoftware.smack.ConnectionConfiguration.DnssecMode;
 import org.jivesoftware.smack.ConnectionConfiguration.SecurityMode;
 import org.jivesoftware.smack.SmackConfiguration.UnknownIqRequestReplyMode;
 import org.jivesoftware.smack.SmackException.AlreadyConnectedException;
@@ -92,6 +68,7 @@ import org.jivesoftware.smack.debugger.SmackDebuggerFactory;
 import org.jivesoftware.smack.filter.IQReplyFilter;
 import org.jivesoftware.smack.filter.StanzaFilter;
 import org.jivesoftware.smack.filter.StanzaIdFilter;
+import org.jivesoftware.smack.internal.SmackTlsContext;
 import org.jivesoftware.smack.iqrequest.IQRequestHandler;
 import org.jivesoftware.smack.packet.Bind;
 import org.jivesoftware.smack.packet.ErrorIQ;
@@ -128,16 +105,12 @@ import org.jivesoftware.smack.sasl.packet.SaslNonza;
 import org.jivesoftware.smack.util.Async;
 import org.jivesoftware.smack.util.CollectionUtil;
 import org.jivesoftware.smack.util.Consumer;
-import org.jivesoftware.smack.util.DNSUtil;
 import org.jivesoftware.smack.util.MultiMap;
 import org.jivesoftware.smack.util.Objects;
 import org.jivesoftware.smack.util.PacketParserUtils;
 import org.jivesoftware.smack.util.ParserUtils;
 import org.jivesoftware.smack.util.Predicate;
 import org.jivesoftware.smack.util.StringUtils;
-import org.jivesoftware.smack.util.TLSUtils;
-import org.jivesoftware.smack.util.dns.SmackDaneProvider;
-import org.jivesoftware.smack.util.dns.SmackDaneVerifier;
 import org.jivesoftware.smack.xml.XmlPullParser;
 import org.jivesoftware.smack.xml.XmlPullParserException;
 
@@ -372,17 +345,6 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
 
     protected final AsyncButOrdered<StanzaListener> inOrderListeners = new AsyncButOrdered<>();
 
-    /**
-     * An executor which uses {@link #asyncGoLimited(Runnable)} to limit the number of asynchronously processed runnables
-     * per connection.
-     */
-    private final Executor limitedExcutor = new Executor() {
-        @Override
-        public void execute(Runnable runnable) {
-            asyncGoLimited(runnable);
-        }
-    };
-
     /**
      * The used host to establish the connection to
      */
@@ -1523,7 +1485,7 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
                         executorService = ASYNC_BUT_ORDERED.asExecutorFor(this);
                         break;
                     case async:
-                        executorService = limitedExcutor;
+                        executorService = this::asyncGoLimited;
                         break;
                     }
                     final IQRequestHandler finalIqRequestHandler = iqRequestHandler;
@@ -2162,7 +2124,7 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
     }
 
     protected static ScheduledAction schedule(Runnable runnable, long delay, TimeUnit unit) {
-        return SMACK_REACTOR.schedule(runnable, delay, unit);
+        return SMACK_REACTOR.schedule(runnable, delay, unit, ScheduledAction.Kind.NonBlocking);
     }
 
     protected void onStreamOpen(XmlPullParser parser) {
@@ -2213,148 +2175,7 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
         outgoingStreamXmlEnvironment = xmlEnvironmentBuilder.build();
     }
 
-    public static final class SmackTlsContext {
-        public final SSLContext sslContext;
-        public final SmackDaneVerifier daneVerifier;
-
-        private SmackTlsContext(SSLContext sslContext, SmackDaneVerifier daneVerifier) {
-            assert sslContext != null;
-            this.sslContext = sslContext;
-            this.daneVerifier = daneVerifier;
-        }
-    }
-
-    protected final SmackTlsContext getSmackTlsContext() throws KeyManagementException, NoSuchAlgorithmException,
-                    CertificateException, IOException, UnrecoverableKeyException, KeyStoreException, NoSuchProviderException {
-        SmackDaneVerifier daneVerifier = null;
-
-        if (config.getDnssecMode() == DnssecMode.needsDnssecAndDane) {
-            SmackDaneProvider daneProvider = DNSUtil.getDaneProvider();
-            if (daneProvider == null) {
-                throw new UnsupportedOperationException("DANE enabled but no SmackDaneProvider configured");
-            }
-            daneVerifier = daneProvider.newInstance();
-            if (daneVerifier == null) {
-                throw new IllegalStateException("DANE requested but DANE provider did not return a DANE verifier");
-            }
-        }
-
-        SSLContext context = this.config.getCustomSSLContext();
-        KeyStore ks = null;
-        PasswordCallback pcb = null;
-
-        if (context == null) {
-            final String keyStoreType = config.getKeystoreType();
-            final CallbackHandler callbackHandler = config.getCallbackHandler();
-            final String keystorePath = config.getKeystorePath();
-            if ("PKCS11".equals(keyStoreType)) {
-                try {
-                    Constructor<?> c = Class.forName("sun.security.pkcs11.SunPKCS11").getConstructor(InputStream.class);
-                    String pkcs11Config = "name = SmartCard\nlibrary = " + config.getPKCS11Library();
-                    ByteArrayInputStream config = new ByteArrayInputStream(pkcs11Config.getBytes(StandardCharsets.UTF_8));
-                    Provider p = (Provider) c.newInstance(config);
-                    Security.addProvider(p);
-                    ks = KeyStore.getInstance("PKCS11", p);
-                    pcb = new PasswordCallback("PKCS11 Password: ", false);
-                    callbackHandler.handle(new Callback[] {pcb});
-                    ks.load(null, pcb.getPassword());
-                }
-                catch (Exception e) {
-                    LOGGER.log(Level.WARNING, "Exception", e);
-                    ks = null;
-                }
-            }
-            else if ("Apple".equals(keyStoreType)) {
-                ks = KeyStore.getInstance("KeychainStore", "Apple");
-                ks.load(null, null);
-                // pcb = new PasswordCallback("Apple Keychain",false);
-                // pcb.setPassword(null);
-            }
-            else if (keyStoreType != null) {
-                ks = KeyStore.getInstance(keyStoreType);
-                if (callbackHandler != null && StringUtils.isNotEmpty(keystorePath)) {
-                    try {
-                        pcb = new PasswordCallback("Keystore Password: ", false);
-                        callbackHandler.handle(new Callback[] { pcb });
-                        ks.load(new FileInputStream(keystorePath), pcb.getPassword());
-                    }
-                    catch (Exception e) {
-                        LOGGER.log(Level.WARNING, "Exception", e);
-                        ks = null;
-                    }
-                } else {
-                    InputStream stream = TLSUtils.getDefaultTruststoreStreamIfPossible();
-                    try {
-                        // Note that PKCS12 keystores need a password one some Java platforms. Hence we try the famous
-                        // 'changeit' here. See https://bugs.openjdk.java.net/browse/JDK-8194702
-                        char[] password = "changeit".toCharArray();
-                        try {
-                            ks.load(stream, password);
-                        } finally {
-                            stream.close();
-                        }
-                    } catch (IOException e) {
-                        LOGGER.log(Level.FINE, "KeyStore load() threw, attempting 'jks' fallback", e);
-
-                        ks = KeyStore.getInstance("jks");
-                        // Open the stream again, so that we read it from the beginning.
-                        stream = TLSUtils.getDefaultTruststoreStreamIfPossible();
-                        try {
-                            ks.load(stream, null);
-                        } finally {
-                            stream.close();
-                        }
-                    }
-                }
-            }
-
-            KeyManager[] kms = null;
-
-            if (ks != null) {
-                String keyManagerFactoryAlgorithm = KeyManagerFactory.getDefaultAlgorithm();
-                KeyManagerFactory kmf = null;
-                try {
-                    kmf = KeyManagerFactory.getInstance(keyManagerFactoryAlgorithm);
-                }
-                catch (NoSuchAlgorithmException e) {
-                    LOGGER.log(Level.FINE, "Could get the default KeyManagerFactory for the '"
-                                    + keyManagerFactoryAlgorithm + "' algorithm", e);
-                }
-                if (kmf != null) {
-                    try {
-                        if (pcb == null) {
-                            kmf.init(ks, null);
-                        }
-                        else {
-                            kmf.init(ks, pcb.getPassword());
-                            pcb.clearPassword();
-                        }
-                        kms = kmf.getKeyManagers();
-                    }
-                    catch (NullPointerException npe) {
-                        LOGGER.log(Level.WARNING, "NullPointerException", npe);
-                    }
-                }
-            }
-
-            // If the user didn't specify a SSLContext, use the default one
-            context = SSLContext.getInstance("TLS");
-
-            final SecureRandom secureRandom = new java.security.SecureRandom();
-            X509TrustManager trustManager = config.getCustomX509TrustManager();
-            if (trustManager == null) {
-                trustManager = TLSUtils.getDefaultX509TrustManager(ks);
-            }
-
-            if (daneVerifier != null) {
-                // User requested DANE verification.
-                daneVerifier.init(context, kms, trustManager, secureRandom);
-            } else {
-                TrustManager[] customTrustManagers = new TrustManager[] { trustManager };
-                context.init(kms, customTrustManagers, secureRandom);
-            }
-        }
-
-        return new SmackTlsContext(context, daneVerifier);
+    protected final SmackTlsContext getSmackTlsContext() {
+        return config.smackTlsContext;
     }
 }

smack-core/src/main/java/org/jivesoftware/smack/ConnectionConfiguration.java

@@ -17,9 +17,24 @@
 
 package org.jivesoftware.smack;
 
+import java.io.ByteArrayInputStream;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
+import java.nio.charset.StandardCharsets;
+import java.security.KeyManagementException;
 import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.NoSuchProviderException;
+import java.security.Provider;
+import java.security.Security;
+import java.security.UnrecoverableKeyException;
+import java.security.cert.CertificateException;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
@@ -31,20 +46,34 @@ import java.util.logging.Logger;
 
 import javax.net.SocketFactory;
 import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.KeyManager;
+import javax.net.ssl.KeyManagerFactory;
 import javax.net.ssl.SSLContext;
+import javax.net.ssl.TrustManager;
 import javax.net.ssl.X509TrustManager;
+import javax.security.auth.callback.Callback;
 import javax.security.auth.callback.CallbackHandler;
+import javax.security.auth.callback.PasswordCallback;
+import javax.security.auth.callback.UnsupportedCallbackException;
 
+import org.jivesoftware.smack.datatypes.UInt16;
 import org.jivesoftware.smack.debugger.SmackDebuggerFactory;
+import org.jivesoftware.smack.internal.SmackTlsContext;
 import org.jivesoftware.smack.packet.id.StandardStanzaIdSource;
 import org.jivesoftware.smack.packet.id.StanzaIdSource;
 import org.jivesoftware.smack.packet.id.StanzaIdSourceFactory;
 import org.jivesoftware.smack.proxy.ProxyInfo;
 import org.jivesoftware.smack.sasl.SASLMechanism;
 import org.jivesoftware.smack.sasl.core.SASLAnonymous;
+import org.jivesoftware.smack.util.CloseableUtil;
 import org.jivesoftware.smack.util.CollectionUtil;
+import org.jivesoftware.smack.util.DNSUtil;
 import org.jivesoftware.smack.util.Objects;
+import org.jivesoftware.smack.util.SslContextFactory;
 import org.jivesoftware.smack.util.StringUtils;
+import org.jivesoftware.smack.util.TLSUtils;
+import org.jivesoftware.smack.util.dns.SmackDaneProvider;
+import org.jivesoftware.smack.util.dns.SmackDaneVerifier;
 
 import org.jxmpp.jid.DomainBareJid;
 import org.jxmpp.jid.EntityBareJid;
@@ -101,12 +130,7 @@ public abstract class ConnectionConfiguration {
 
     protected final InetAddress hostAddress;
     protected final DnsName host;
-    protected final int port;
-
-    private final String keystorePath;
-    private final String keystoreType;
-    private final String pkcs11Library;
-    private final SSLContext customSSLContext;
+    protected final UInt16 port;
 
     /**
      * Used to get information from the user
@@ -137,9 +161,9 @@ public abstract class ConnectionConfiguration {
 
     private final SecurityMode securityMode;
 
-    private final DnssecMode dnssecMode;
+    final SmackTlsContext smackTlsContext;
 
-    private final X509TrustManager customX509TrustManager;
+    private final DnssecMode dnssecMode;
 
     /**
      *
@@ -165,6 +189,17 @@ public abstract class ConnectionConfiguration {
     private final StanzaIdSourceFactory stanzaIdSourceFactory;
 
     protected ConnectionConfiguration(Builder<?, ?> builder) {
+        try {
+            smackTlsContext = getSmackTlsContext(builder.dnssecMode, builder.sslContextFactory,
+                            builder.customX509TrustManager, builder.keystoreType, builder.keystorePath,
+                            builder.callbackHandler, builder.pkcs11Library);
+        } catch (UnrecoverableKeyException | KeyManagementException | NoSuchAlgorithmException | CertificateException
+                        | KeyStoreException | NoSuchProviderException | IOException | NoSuchMethodException
+                        | SecurityException | ClassNotFoundException | InstantiationException | IllegalAccessException
+                        | IllegalArgumentException | InvocationTargetException | UnsupportedCallbackException e) {
+            throw new IllegalArgumentException(e);
+        }
+
         authzid = builder.authzid;
         username = builder.username;
         password = builder.password;
@@ -201,13 +236,7 @@ public abstract class ConnectionConfiguration {
 
         dnssecMode = builder.dnssecMode;
 
-        customX509TrustManager = builder.customX509TrustManager;
-
         securityMode = builder.securityMode;
-        keystoreType = builder.keystoreType;
-        keystorePath = builder.keystorePath;
-        pkcs11Library = builder.pkcs11Library;
-        customSSLContext = builder.customSSLContext;
         enabledSSLProtocols = builder.enabledSSLProtocols;
         enabledSSLCiphers = builder.enabledSSLCiphers;
         hostnameVerifier = builder.hostnameVerifier;
@@ -222,11 +251,115 @@ public abstract class ConnectionConfiguration {
 
         // If the enabledSaslmechanisms are set, then they must not be empty
         assert enabledSaslMechanisms == null || !enabledSaslMechanisms.isEmpty();
+    }
 
-        if (dnssecMode != DnssecMode.disabled && customSSLContext != null) {
-            throw new IllegalStateException("You can not use a custom SSL context with DNSSEC enabled");
+    private static SmackTlsContext getSmackTlsContext(DnssecMode dnssecMode, SslContextFactory sslContextFactory,
+                    X509TrustManager trustManager, String keystoreType, String keystorePath,
+                    CallbackHandler callbackHandler, String pkcs11Library) throws NoSuchAlgorithmException,
+                    CertificateException, IOException, KeyStoreException, NoSuchProviderException,
+                    UnrecoverableKeyException, KeyManagementException, UnsupportedCallbackException,
+                    NoSuchMethodException, SecurityException, ClassNotFoundException, InstantiationException,
+                    IllegalAccessException, IllegalArgumentException, InvocationTargetException {
+        final SSLContext context;
+        if (sslContextFactory != null) {
+            context = sslContextFactory.createSslContext();
+        } else {
+            // If the user didn't specify a SslContextFactory, use the default one
+            context = SSLContext.getInstance("TLS");
         }
 
+        KeyStore ks = null;
+        PasswordCallback pcb = null;
+        KeyManager[] kms = null;
+
+        if ("PKCS11".equals(keystoreType)) {
+                Constructor<?> c = Class.forName("sun.security.pkcs11.SunPKCS11").getConstructor(InputStream.class);
+                String pkcs11Config = "name = SmartCard\nlibrary = " + pkcs11Library;
+                ByteArrayInputStream config = new ByteArrayInputStream(pkcs11Config.getBytes(StandardCharsets.UTF_8));
+                Provider p = (Provider) c.newInstance(config);
+                Security.addProvider(p);
+                ks = KeyStore.getInstance("PKCS11", p);
+                pcb = new PasswordCallback("PKCS11 Password: ", false);
+                callbackHandler.handle(new Callback[] { pcb });
+                ks.load(null, pcb.getPassword());
+        } else if ("Apple".equals(keystoreType)) {
+            ks = KeyStore.getInstance("KeychainStore", "Apple");
+            ks.load(null, null);
+            // pcb = new PasswordCallback("Apple Keychain",false);
+            // pcb.setPassword(null);
+        } else if (keystoreType != null) {
+            ks = KeyStore.getInstance(keystoreType);
+            if (callbackHandler != null && StringUtils.isNotEmpty(keystorePath)) {
+                pcb = new PasswordCallback("Keystore Password: ", false);
+                callbackHandler.handle(new Callback[] { pcb });
+                ks.load(new FileInputStream(keystorePath), pcb.getPassword());
+            } else {
+                InputStream stream = TLSUtils.getDefaultTruststoreStreamIfPossible();
+                try {
+                    // Note that PKCS12 keystores need a password one some Java platforms. Hence we try the famous
+                    // 'changeit' here. See https://bugs.openjdk.java.net/browse/JDK-8194702
+                    char[] password = "changeit".toCharArray();
+                    try {
+                        ks.load(stream, password);
+                    } finally {
+                        CloseableUtil.maybeClose(stream);
+                    }
+                } catch (IOException e) {
+                    LOGGER.log(Level.FINE, "KeyStore load() threw, attempting 'jks' fallback", e);
+
+                    ks = KeyStore.getInstance("jks");
+                    // Open the stream again, so that we read it from the beginning.
+                    stream = TLSUtils.getDefaultTruststoreStreamIfPossible();
+                    try {
+                        ks.load(stream, null);
+                    } finally {
+                        CloseableUtil.maybeClose(stream);
+                    }
+                }
+            }
+        }
+
+        if (ks != null) {
+            String keyManagerFactoryAlgorithm = KeyManagerFactory.getDefaultAlgorithm();
+            KeyManagerFactory kmf = KeyManagerFactory.getInstance(keyManagerFactoryAlgorithm);
+            if (kmf != null) {
+                if (pcb == null) {
+                    kmf.init(ks, null);
+                } else {
+                    kmf.init(ks, pcb.getPassword());
+                    pcb.clearPassword();
+                }
+                kms = kmf.getKeyManagers();
+            }
+        }
+
+        SmackDaneVerifier daneVerifier = null;
+        if (dnssecMode == DnssecMode.needsDnssecAndDane) {
+            SmackDaneProvider daneProvider = DNSUtil.getDaneProvider();
+            if (daneProvider == null) {
+                throw new UnsupportedOperationException("DANE enabled but no SmackDaneProvider configured");
+            }
+            daneVerifier = daneProvider.newInstance();
+            if (daneVerifier == null) {
+                throw new IllegalStateException("DANE requested but DANE provider did not return a DANE verifier");
+            }
+
+            // User requested DANE verification.
+            daneVerifier.init(context, kms, trustManager, null);
+        } else {
+            final TrustManager[] trustManagers;
+            if (trustManager != null) {
+                trustManagers = new TrustManager[] { trustManager };
+            } else {
+                // Ensure trustManagers is null in case there was no explicit trust manager provided, so that the
+                // default one is used.
+                trustManagers = null;
+            }
+
+            context.init(kms, trustManagers, null);
+        }
+
+        return new SmackTlsContext(context, daneVerifier);
     }
 
     public DnsName getHost() {
@@ -237,7 +370,7 @@ public abstract class ConnectionConfiguration {
         return hostAddress;
     }
 
-    public int getPort() {
+    public UInt16 getPort() {
         return port;
     }
 
@@ -286,50 +419,6 @@ public abstract class ConnectionConfiguration {
         return dnssecMode;
     }
 
-    public X509TrustManager getCustomX509TrustManager() {
-        return customX509TrustManager;
-    }
-
-    /**
-     * Retuns the path to the keystore file. The key store file contains the
-     * certificates that may be used to authenticate the client to the server,
-     * in the event the server requests or requires it.
-     *
-     * @return the path to the keystore file.
-     */
-    public String getKeystorePath() {
-        return keystorePath;
-    }
-
-    /**
-     * Returns the keystore type, or <code>null</code> if it's not set.
-     *
-     * @return the keystore type.
-     */
-    public String getKeystoreType() {
-        return keystoreType;
-    }
-
-    /**
-     * Returns the PKCS11 library file location, needed when the
-     * Keystore type is PKCS11.
-     *
-     * @return the path to the PKCS11 library file
-     */
-    public String getPKCS11Library() {
-        return pkcs11Library;
-    }
-
-    /**
-     * Gets the custom SSLContext previously set with {@link ConnectionConfiguration.Builder#setCustomSSLContext(SSLContext)} for
-     * SSL sockets. This is null by default.
-     *
-     * @return the custom SSLContext or null.
-     */
-    public SSLContext getCustomSSLContext() {
-        return this.customSSLContext;
-    }
-
     /**
      * Return the enabled SSL/TLS protocols.
      *
@@ -599,12 +688,12 @@ public abstract class ConnectionConfiguration {
      * @param <C> the resulting connection configuration type parameter.
      */
     public abstract static class Builder<B extends Builder<B, C>, C extends ConnectionConfiguration> {
-        private SecurityMode securityMode = SecurityMode.ifpossible;
+        private SecurityMode securityMode = SecurityMode.required;
         private DnssecMode dnssecMode = DnssecMode.disabled;
-        private String keystorePath = System.getProperty("javax.net.ssl.keyStore");
-        private String keystoreType = KeyStore.getDefaultType();
+        private String keystorePath;
+        private String keystoreType;
         private String pkcs11Library = "pkcs11.config";
-        private SSLContext customSSLContext;
+        private SslContextFactory sslContextFactory;
         private String[] enabledSSLProtocols;
         private String[] enabledSSLCiphers;
         private HostnameVerifier hostnameVerifier;
@@ -621,7 +710,7 @@ public abstract class ConnectionConfiguration {
         private DomainBareJid xmppServiceDomain;
         private InetAddress hostAddress;
         private DnsName host;
-        private int port = 5222;
+        private UInt16 port = UInt16.from(5222);
         private boolean allowEmptyOrNullUsername = false;
         private boolean saslMechanismsSealed;
         private Set<String> enabledSaslMechanisms;
@@ -837,7 +926,12 @@ public abstract class ConnectionConfiguration {
                 throw new IllegalArgumentException(
                         "Port must be a 16-bit unsigned integer (i.e. between 0-65535. Port was: " + port);
             }
-            this.port = port;
+            UInt16 portUint16 = UInt16.from(port);
+            return setPort(portUint16);
+        }
+
+        public B setPort(UInt16 port) {
+            this.port = Objects.requireNonNull(port);
             return getThis();
         }
 
@@ -923,9 +1017,28 @@ public abstract class ConnectionConfiguration {
          *
          * @param context the custom SSLContext for new sockets.
          * @return a reference to this builder.
+         * @deprecated use {@link #setSslContextFactory(SslContextFactory)} instead}.
          */
+        // TODO: Remove in Smack 4.5.
+        @Deprecated
         public B setCustomSSLContext(SSLContext context) {
-            this.customSSLContext = Objects.requireNonNull(context, "The SSLContext must not be null");
+            return setSslContextFactory(() -> {
+                return context;
+            });
+        }
+
+        /**
+         * Sets a custom SSLContext for creating SSL sockets.
+         * <p>
+         * For more information on how to create a SSLContext see <a href=
+         * "http://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/JSSERefGuide.html#X509TrustManager"
+         * >Java Secure Socket Extension (JSEE) Reference Guide: Creating Your Own X509TrustManager</a>
+         *
+         * @param sslContextFactory the custom SSLContext for new sockets.
+         * @return a reference to this builder.
+         */
+        public B setSslContextFactory(SslContextFactory sslContextFactory) {
+            this.sslContextFactory = Objects.requireNonNull(sslContextFactory, "The provided SslContextFactory must not be null");
             return getThis();
         }
 
@@ -1166,5 +1279,4 @@ public abstract class ConnectionConfiguration {
 
         protected abstract B getThis();
     }
-
 }

smack-core/src/main/java/org/jivesoftware/smack/Manager.java

@@ -54,6 +54,14 @@ public abstract class Manager {
     }
 
     protected static final ScheduledAction schedule(Runnable runnable, long delay, TimeUnit unit) {
-        return AbstractXMPPConnection.SMACK_REACTOR.schedule(runnable, delay, unit);
+        return schedule(runnable, delay, unit, ScheduledAction.Kind.NonBlocking);
+    }
+
+    protected static final ScheduledAction scheduleBlocking(Runnable runnable, long delay, TimeUnit unit) {
+        return schedule(runnable, delay, unit, ScheduledAction.Kind.Blocking);
+    }
+
+    protected static final ScheduledAction schedule(Runnable runnable, long delay, TimeUnit unit, ScheduledAction.Kind scheduledActionKind) {
+        return AbstractXMPPConnection.SMACK_REACTOR.schedule(runnable, delay, unit, scheduledActionKind);
     }
 }

smack-core/src/main/java/org/jivesoftware/smack/ScheduledAction.java

@@ -20,20 +20,34 @@ import java.util.Date;
 import java.util.concurrent.Delayed;
 import java.util.concurrent.TimeUnit;
 
+import org.jivesoftware.smack.util.Async;
+
 public class ScheduledAction implements Delayed {
 
-    final Runnable action;
+    enum Kind {
+        NonBlocking,
+        Blocking,
+    }
+
+    private final Runnable action;
     final Date releaseTime;
     final SmackReactor smackReactor;
+    final Kind kind;
 
-    ScheduledAction(Runnable action, Date releaseTime, SmackReactor smackReactor) {
+    ScheduledAction(Runnable action, Date releaseTime, SmackReactor smackReactor, Kind kind) {
         this.action = action;
         this.releaseTime = releaseTime;
         this.smackReactor = smackReactor;
+        this.kind = kind;
     }
 
-    public void cancel() {
-        smackReactor.cancel(this);
+    /**
+     * Cancels this scheduled action.
+     *
+     * @return <code>true</code> if the scheduled action was still pending and got removed, <code>false</code> otherwise.
+     */
+    public boolean cancel() {
+        return smackReactor.cancel(this);
     }
 
     public boolean isDue() {
@@ -63,4 +77,15 @@ public class ScheduledAction implements Delayed {
         long delayInMillis = getTimeToDueMillis();
         return unit.convert(delayInMillis, TimeUnit.MILLISECONDS);
     }
+
+    void run() {
+        switch (kind) {
+        case NonBlocking:
+            action.run();
+            break;
+        case Blocking:
+            Async.go(() -> action.run());
+            break;
+        }
+    }
 }

smack-core/src/main/java/org/jivesoftware/smack/SmackReactor.java

@@ -145,15 +145,21 @@ public class SmackReactor {
         }
     }
 
-    ScheduledAction schedule(Runnable runnable, long delay, TimeUnit unit) {
+    ScheduledAction schedule(Runnable runnable, long delay, TimeUnit unit, ScheduledAction.Kind scheduledActionKind) {
         long releaseTimeEpoch = System.currentTimeMillis() + unit.toMillis(delay);
         Date releaseTimeDate = new Date(releaseTimeEpoch);
-        ScheduledAction scheduledAction = new ScheduledAction(runnable, releaseTimeDate, this);
+        ScheduledAction scheduledAction = new ScheduledAction(runnable, releaseTimeDate, this, scheduledActionKind);
         scheduledActions.add(scheduledAction);
         selector.wakeup();
         return scheduledAction;
     }
 
+    /**
+     * Cancels the scheduled action.
+     *
+     * @param scheduledAction the scheduled action to cancel.
+     * @return <code>true</code> if the scheduled action was still pending and got removed, <code>false</code> otherwise.
+     */
     boolean cancel(ScheduledAction scheduledAction) {
         return scheduledActions.remove(scheduledAction);
     }
@@ -200,7 +206,7 @@ public class SmackReactor {
             }
 
             if (dueScheduledAction != null) {
-                dueScheduledAction.action.run();
+                dueScheduledAction.run();
                 return;
             }
 

smack-core/src/main/java/org/jivesoftware/smack/c2s/ModularXmppClientToServerConnection.java

@@ -17,11 +17,6 @@
 package org.jivesoftware.smack.c2s;
 
 import java.io.IOException;
-import java.security.KeyManagementException;
-import java.security.KeyStoreException;
-import java.security.NoSuchAlgorithmException;
-import java.security.NoSuchProviderException;
-import java.security.UnrecoverableKeyException;
 import java.security.cert.CertificateException;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -65,6 +60,8 @@ import org.jivesoftware.smack.fsm.StateDescriptorGraph.GraphVertex;
 import org.jivesoftware.smack.fsm.StateMachineException;
 import org.jivesoftware.smack.fsm.StateTransitionResult;
 import org.jivesoftware.smack.fsm.StateTransitionResult.AttemptResult;
+import org.jivesoftware.smack.internal.AbstractStats;
+import org.jivesoftware.smack.internal.SmackTlsContext;
 import org.jivesoftware.smack.packet.IQ;
 import org.jivesoftware.smack.packet.Message;
 import org.jivesoftware.smack.packet.Nonza;
@@ -78,6 +75,7 @@ import org.jivesoftware.smack.parsing.SmackParsingException;
 import org.jivesoftware.smack.sasl.SASLErrorException;
 import org.jivesoftware.smack.sasl.SASLMechanism;
 import org.jivesoftware.smack.util.ArrayBlockingQueueWithShutdown;
+import org.jivesoftware.smack.util.ExtendedAppendable;
 import org.jivesoftware.smack.util.PacketParserUtils;
 import org.jivesoftware.smack.util.StringUtils;
 import org.jivesoftware.smack.xml.XmlPullParser;
@@ -184,9 +182,7 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
             }
 
             @Override
-            public SmackTlsContext getSmackTlsContext()
-                            throws KeyManagementException, NoSuchAlgorithmException, CertificateException, IOException,
-                            UnrecoverableKeyException, KeyStoreException, NoSuchProviderException {
+            public SmackTlsContext getSmackTlsContext() {
                 return ModularXmppClientToServerConnection.this.getSmackTlsContext();
             }
 
@@ -1069,7 +1065,7 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
         return new Stats(transportsStats, filterStats);
     }
 
-    public static final class Stats {
+    public static final class Stats extends AbstractStats {
         public final Map<Class<? extends ModularXmppClientToServerConnectionModuleDescriptor>, XmppClientToServerTransport.Stats> transportsStats;
         public final Map<String, Object> filtersStats;
 
@@ -1079,7 +1075,8 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
             this.filtersStats = Collections.unmodifiableMap(filtersStats);
         }
 
-        public void appendStatsTo(Appendable appendable) throws IOException {
+        @Override
+        public void appendStatsTo(ExtendedAppendable appendable) throws IOException {
             StringUtils.appendHeading(appendable, "Connection stats", '#').append('\n');
 
             for (Map.Entry<Class<? extends ModularXmppClientToServerConnectionModuleDescriptor>, XmppClientToServerTransport.Stats> entry : transportsStats.entrySet()) {
@@ -1099,16 +1096,5 @@ public final class ModularXmppClientToServerConnection extends AbstractXMPPConne
             }
         }
 
-        @Override
-        public String toString() {
-            StringBuilder sb = new StringBuilder();
-            try {
-                appendStatsTo(sb);
-            } catch (IOException e) {
-                // Should never happen.
-                throw new AssertionError(e);
-            }
-            return sb.toString();
-        }
     }
 }

smack-core/src/main/java/org/jivesoftware/smack/c2s/internal/ModularXmppClientToServerConnectionInternal.java

@@ -16,20 +16,12 @@
  */
 package org.jivesoftware.smack.c2s.internal;
 
-import java.io.IOException;
 import java.nio.channels.ClosedChannelException;
 import java.nio.channels.SelectableChannel;
 import java.nio.channels.SelectionKey;
-import java.security.KeyManagementException;
-import java.security.KeyStoreException;
-import java.security.NoSuchAlgorithmException;
-import java.security.NoSuchProviderException;
-import java.security.UnrecoverableKeyException;
-import java.security.cert.CertificateException;
 import java.util.ListIterator;
 import java.util.Queue;
 
-import org.jivesoftware.smack.AbstractXMPPConnection.SmackTlsContext;
 import org.jivesoftware.smack.SmackException.ConnectionUnexpectedTerminatedException;
 import org.jivesoftware.smack.SmackException.NoResponseException;
 import org.jivesoftware.smack.SmackException.NotConnectedException;
@@ -41,6 +33,7 @@ import org.jivesoftware.smack.c2s.ModularXmppClientToServerConnection;
 import org.jivesoftware.smack.c2s.XmppClientToServerTransport;
 import org.jivesoftware.smack.debugger.SmackDebugger;
 import org.jivesoftware.smack.fsm.ConnectionStateEvent;
+import org.jivesoftware.smack.internal.SmackTlsContext;
 import org.jivesoftware.smack.packet.Nonza;
 import org.jivesoftware.smack.packet.TopLevelStreamElement;
 import org.jivesoftware.smack.packet.XmlEnvironment;
@@ -107,9 +100,7 @@ public abstract class ModularXmppClientToServerConnectionInternal {
     public abstract void newStreamOpenWaitForFeaturesSequence(String waitFor) throws InterruptedException,
                     ConnectionUnexpectedTerminatedException, NoResponseException, NotConnectedException;
 
-    public abstract SmackTlsContext getSmackTlsContext()
-                    throws KeyManagementException, NoSuchAlgorithmException, CertificateException, IOException,
-                    UnrecoverableKeyException, KeyStoreException, NoSuchProviderException;
+    public abstract SmackTlsContext getSmackTlsContext();
 
     public abstract <SN extends Nonza, FN extends Nonza> SN sendAndWaitForResponse(Nonza nonza,
                     Class<SN> successNonzaClass, Class<FN> failedNonzaClass)

smack-core/src/main/java/org/jivesoftware/smack/compression/XMPPInputOutputStream.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2013-2018 Florian Schmaus
+ * Copyright 2013-2020 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,9 +20,11 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 
+import org.jivesoftware.smack.util.Objects;
+
 public abstract class XMPPInputOutputStream {
 
-    protected static FlushMethod flushMethod;
+    protected static FlushMethod flushMethod = FlushMethod.SYNC_FLUSH;
 
     /**
      * Set the used flushed method when compressing data. The default is full flush which may not
@@ -33,7 +35,7 @@ public abstract class XMPPInputOutputStream {
      * @param flushMethod TODO javadoc me please
      */
     public static void setFlushMethod(FlushMethod flushMethod) {
-        XMPPInputOutputStream.flushMethod = flushMethod;
+        XMPPInputOutputStream.flushMethod = Objects.requireNonNull(flushMethod);
     }
 
     public static FlushMethod getFlushMethod() {

smack-core/src/main/java/org/jivesoftware/smack/filter/StanzaFilter.java

@@ -66,4 +66,13 @@ public interface StanzaFilter extends Predicate<Stanza> {
     default boolean test(Stanza stanza) {
         return accept(stanza);
     }
+
+    default <S extends Stanza> Predicate<S> asPredicate(Class<?> stanzaClass) {
+        return s -> {
+            if (!stanzaClass.isAssignableFrom(s.getClass())) {
+                return false;
+            }
+            return accept(s);
+        };
+    }
 }

smack-core/src/main/java/org/jivesoftware/smack/internal/AbstractStats.java

@@ -0,0 +1,52 @@
+/**
+ *
+ * Copyright 2020 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smack.internal;
+
+import java.io.IOException;
+
+import org.jivesoftware.smack.util.ExtendedAppendable;
+
+public abstract class AbstractStats {
+
+    public final void appendStatsTo(Appendable appendable) throws IOException {
+        appendStatsTo(new ExtendedAppendable(appendable));
+    }
+
+    public abstract void appendStatsTo(ExtendedAppendable appendable) throws IOException;
+
+    private transient String toStringCache;
+
+    @Override
+    public final String toString() {
+        if (toStringCache != null) {
+            return toStringCache;
+        }
+
+        StringBuilder sb = new StringBuilder();
+        try {
+            appendStatsTo(sb);
+        } catch (IOException e) {
+            // Should never happen.
+            throw new AssertionError(e);
+        }
+
+        toStringCache =  sb.toString();
+
+        return toStringCache;
+    }
+
+}

smack-core/src/main/java/org/jivesoftware/smack/internal/SmackTlsContext.java

@@ -0,0 +1,32 @@
+/**
+ *
+ * Copyright 2020 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smack.internal;
+
+import javax.net.ssl.SSLContext;
+
+import org.jivesoftware.smack.util.dns.SmackDaneVerifier;
+
+public final class SmackTlsContext {
+    public final SSLContext sslContext;
+    public final SmackDaneVerifier daneVerifier;
+
+    public SmackTlsContext(SSLContext sslContext, SmackDaneVerifier daneVerifier) {
+        assert sslContext != null;
+        this.sslContext = sslContext;
+        this.daneVerifier = daneVerifier;
+    }
+}

smack-core/src/main/java/org/jivesoftware/smack/internal/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright 2020 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack internal classes and interfaces.
+ */
+package org.jivesoftware.smack.internal;

smack-core/src/main/java/org/jivesoftware/smack/packet/AbstractIqBuilder.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2019 Florian Schmaus
+ * Copyright 2019-2020 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,6 +23,10 @@ public abstract class AbstractIqBuilder<IB extends AbstractIqBuilder<IB>> extend
 
     protected IQ.Type type = IQ.Type.get;
 
+    AbstractIqBuilder(IQ other, String stanzaId) {
+        super(other, stanzaId);
+    }
+
     AbstractIqBuilder(AbstractIqBuilder<?> other) {
         super(other);
         type = other.type;

smack-core/src/main/java/org/jivesoftware/smack/packet/IqBuilder.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2019 Florian Schmaus
+ * Copyright 2019-2020 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,6 +22,10 @@ import org.jivesoftware.smack.util.Objects;
 public abstract class IqBuilder<IB extends IqBuilder<IB, I>, I extends IQ>
                 extends AbstractIqBuilder<IB> {
 
+    protected IqBuilder(IQ other, String stanzaId) {
+        super(other, stanzaId);
+    }
+
     protected IqBuilder(AbstractIqBuilder<?> other) {
         super(other);
     }

smack-core/src/main/java/org/jivesoftware/smack/packet/Presence.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2003-2007 Jive Software.
+ * Copyright 2003-2007 Jive Software, 2020 Florian Schmaus.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,10 +17,9 @@
 
 package org.jivesoftware.smack.packet;
 
+import java.util.List;
 import java.util.Locale;
 
-import javax.net.SocketFactory;
-
 import org.jivesoftware.smack.util.Objects;
 import org.jivesoftware.smack.util.StringUtils;
 import org.jivesoftware.smack.util.TypedCloneable;
@@ -29,7 +28,7 @@ import org.jivesoftware.smack.util.XmlStringBuilder;
 import org.jxmpp.jid.Jid;
 
 /**
- * Represents XMPP presence packets. Every presence stanza has a type, which is one of
+ * Represents XMPP presence stanzas. Every presence stanza has a type, which is one of
  * the following values:
  * <ul>
  *      <li>{@link Presence.Type#available available} -- (Default) indicates the user is available to
@@ -55,7 +54,7 @@ import org.jxmpp.jid.Jid;
  *          {@link Mode#dnd dnd} (do not disturb).
  * </ul><p>
  *
- * Presence packets are used for two purposes. First, to notify the server of
+ * Presence stanzas are used for two purposes. First, to notify the server of
  * the user's current presence status. Second, they are used to subscribe and
  * unsubscribe users from the roster.
  *
@@ -83,7 +82,7 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
      * Creates a new presence update. Status, priority, and mode are left un-set.
      *
      * @param type the type.
-     * @deprecated use {@link StanzaBuilder} or {@link SocketFactory} instead.
+     * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
      */
     @Deprecated
     // TODO: Remove in Smack 4.5.
@@ -99,7 +98,7 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
      * @param to the recipient.
      * @param type the type.
      * @since 4.2
-     * @deprecated use {@link StanzaBuilder} or {@link SocketFactory} instead.
+     * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
      */
     @Deprecated
     // TODO: Remove in Smack 4.5.
@@ -115,7 +114,7 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
      * @param status a text message describing the presence update.
      * @param priority the priority of this presence update.
      * @param mode the mode type for this presence update.
-     * @deprecated use {@link StanzaBuilder} or {@link SocketFactory} instead.
+     * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
      */
     @Deprecated
     // TODO: Remove in Smack 4.5.
@@ -191,7 +190,7 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
      * Sets the type of the presence packet.
      *
      * @param type the type of the presence packet.
-     * @deprecated use {@link StanzaBuilder} or {@link SocketFactory} instead.
+     * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
      */
     @Deprecated
     // TODO: Remove in Smack 4.5.
@@ -209,7 +208,7 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
      * describing a user's presence (i.e., "gone to lunch").
      *
      * @param status the status message.
-     * @deprecated use {@link StanzaBuilder} or {@link SocketFactory} instead.
+     * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
      */
     @Deprecated
     // TODO: Remove in Smack 4.5.
@@ -236,7 +235,7 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
      * @param priority the priority of the presence.
      * @throws IllegalArgumentException if the priority is outside the valid range.
      * @see <a href="https://tools.ietf.org/html/rfc6121#section-4.7.2.3">RFC 6121 § 4.7.2.3. Priority Element</a>
-     * @deprecated use {@link StanzaBuilder} or {@link SocketFactory} instead.
+     * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
      */
     @Deprecated
     // TODO: Remove in Smack 4.5.
@@ -265,7 +264,7 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
      * to be the same thing as {@link Presence.Mode#available}.
      *
      * @param mode the mode.
-     * @deprecated use {@link StanzaBuilder} or {@link SocketFactory} instead.
+     * @deprecated use {@link PresenceBuilder} or {@link org.jivesoftware.smack.XMPPConnection#getStanzaFactory} instead.
      */
     @Deprecated
     // TODO: Remove in Smack 4.5.
@@ -309,6 +308,16 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
         if (type != Type.available) {
             buf.attribute("type", type);
         }
+
+        List<ExtensionElement> extensions = getExtensions();
+        if (status == null
+                        && priority == null
+                        && (mode == null || mode == Mode.available)
+                        && extensions.isEmpty()
+                        && getError() == null) {
+            return buf.closeEmptyElement();
+        }
+
         buf.rightAngleBracket();
 
         buf.optElement("status", status);
@@ -317,7 +326,7 @@ public final class Presence extends MessageOrPresence<PresenceBuilder>
             buf.element("show", mode);
         }
 
-        buf.append(getExtensions());
+        buf.append(extensions);
 
         // Add the error sub-packet, if there is one.
         appendErrorIfExists(buf);

smack-core/src/main/java/org/jivesoftware/smack/util/ExtendedAppendable.java

@@ -0,0 +1,56 @@
+/**
+ *
+ * Copyright 2020 Florian Schmaus.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smack.util;
+
+import java.io.IOException;
+
+public class ExtendedAppendable implements Appendable {
+
+    private final Appendable appendable;
+
+    public ExtendedAppendable(Appendable appendable) {
+        this.appendable = appendable;
+    }
+
+    @Override
+    public ExtendedAppendable append(CharSequence csq) throws IOException {
+        appendable.append(csq);
+        return this;
+    }
+
+    @Override
+    public ExtendedAppendable append(CharSequence csq, int start, int end) throws IOException {
+        appendable.append(csq, start, end);
+        return this;
+    }
+
+    @Override
+    public ExtendedAppendable append(char c) throws IOException {
+        appendable.append(c);
+        return this;
+    }
+
+    public ExtendedAppendable append(boolean b) throws IOException {
+        appendable.append(String.valueOf(b));
+        return this;
+    }
+
+    public ExtendedAppendable append(int i) throws IOException {
+        appendable.append(String.valueOf(i));
+        return this;
+    }
+}

smack-core/src/main/java/org/jivesoftware/smack/util/NumberUtil.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2015-2019 Florian Schmaus
+ * Copyright © 2015-2020 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,15 +33,15 @@ public class NumberUtil {
     /**
      * Checks if the given long is within the range of an unsigned 32-bit integer, the XML type "xs:unsignedInt".
      *
-     * @param value TODO javadoc me please
+     * @param value the long to check.
      * @return the input value.
      */
     public static long requireUInt32(long value) {
         if (value < 0) {
-            throw new IllegalArgumentException("unsigned 32-bit integers can't be negative");
+            throw new IllegalArgumentException("unsigned 32-bit integers can't be negative: " + value);
         }
         if (value > ((1L << 32) - 1)) {
-            throw new IllegalArgumentException("unsigned 32-bit integers can't be greater than 2^32 - 1");
+            throw new IllegalArgumentException("unsigned 32-bit integers can't be greater than 2^32 - 1: " + value);
         }
         return value;
     }
@@ -49,15 +49,15 @@ public class NumberUtil {
     /**
      * Checks if the given int is within the range of an unsigned 16-bit integer, the XML type "xs:unsignedShort".
      *
-     * @param value TODO javadoc me please
+     * @param value the int to check.
      * @return the input value.
      */
     public static int requireUShort16(int value) {
         if (value < 0) {
-            throw new IllegalArgumentException("unsigned 16-bit integers can't be negative");
+            throw new IllegalArgumentException("unsigned 16-bit integers can't be negative: " + value);
         }
         if (value > ((1 << 16) - 1)) {
-            throw new IllegalArgumentException("unsigned 16-bit integers can't be greater than 2^16 - 1");
+            throw new IllegalArgumentException("unsigned 16-bit integers can't be greater than 2^16 - 1: " + value);
         }
         return value;
     }

smack-core/src/main/java/org/jivesoftware/smack/util/SslContextFactory.java

@@ -0,0 +1,25 @@
+/**
+ *
+ * Copyright 2020 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smack.util;
+
+import javax.net.ssl.SSLContext;
+
+public interface SslContextFactory {
+
+    SSLContext createSslContext();
+
+}

smack-core/src/main/java/org/jivesoftware/smack/util/TLSUtils.java

@@ -22,12 +22,8 @@ import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
-import java.security.KeyManagementException;
-import java.security.KeyStore;
-import java.security.KeyStoreException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
-import java.security.SecureRandom;
 import java.security.cert.Certificate;
 import java.security.cert.CertificateEncodingException;
 import java.security.cert.CertificateException;
@@ -38,13 +34,9 @@ import java.util.Set;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
-import javax.net.ssl.HostnameVerifier;
-import javax.net.ssl.SSLContext;
 import javax.net.ssl.SSLPeerUnverifiedException;
 import javax.net.ssl.SSLSession;
 import javax.net.ssl.SSLSocket;
-import javax.net.ssl.TrustManager;
-import javax.net.ssl.TrustManagerFactory;
 import javax.net.ssl.X509TrustManager;
 
 import org.jivesoftware.smack.ConnectionConfiguration;
@@ -132,25 +124,13 @@ public class TLSUtils {
      *
      * @param builder a connection configuration builder.
      * @param <B> Type of the ConnectionConfiguration builder.
-     * @throws NoSuchAlgorithmException if no such algorithm is available.
-     * @throws KeyManagementException if there was a key mangement error.
      * @return the given builder.
      */
-    public static <B extends ConnectionConfiguration.Builder<B, ?>> B acceptAllCertificates(B builder) throws NoSuchAlgorithmException, KeyManagementException {
-        SSLContext context = SSLContext.getInstance(TLS);
-        context.init(null, new TrustManager[] { new AcceptAllTrustManager() }, new SecureRandom());
-        builder.setCustomSSLContext(context);
+    public static <B extends ConnectionConfiguration.Builder<B, ?>> B acceptAllCertificates(B builder) {
+        builder.setCustomX509TrustManager(new AcceptAllTrustManager());
         return builder;
     }
 
-    private static final HostnameVerifier DOES_NOT_VERIFY_VERIFIER = new HostnameVerifier() {
-        @Override
-        public boolean verify(String hostname, SSLSession session) {
-            // This verifier doesn't verify the hostname, it always returns true.
-            return true;
-        }
-    };
-
     /**
      * Disable the hostname verification of TLS certificates.
      * <p>
@@ -164,7 +144,9 @@ public class TLSUtils {
      * @return the given builder.
      */
     public static <B extends ConnectionConfiguration.Builder<B, ?>> B disableHostnameVerificationForTlsCertificates(B builder) {
-        builder.setHostnameVerifier(DOES_NOT_VERIFY_VERIFIER);
+        builder.setHostnameVerifier((hostname, session) -> {
+            return true;
+        });
         return builder;
     }
 
@@ -274,24 +256,6 @@ public class TLSUtils {
         }
     }
 
-    public static X509TrustManager getDefaultX509TrustManager(KeyStore keyStore) {
-        String defaultAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
-        TrustManagerFactory trustManagerFactory;
-        try {
-            trustManagerFactory = TrustManagerFactory.getInstance(defaultAlgorithm);
-            trustManagerFactory.init(keyStore);
-        } catch (NoSuchAlgorithmException | KeyStoreException e) {
-            throw new AssertionError(e);
-        }
-
-        for (TrustManager trustManager : trustManagerFactory.getTrustManagers()) {
-            if (trustManager instanceof X509TrustManager) {
-                return (X509TrustManager) trustManager;
-            }
-        }
-        throw new AssertionError("No trust manager for the default algorithm " + defaultAlgorithm + " found");
-    }
-
     private static final File DEFAULT_TRUSTSTORE_PATH;
 
     static {

smack-core/src/test/java/org/jivesoftware/smack/provider/ProviderManagerTest.java

@@ -29,6 +29,7 @@ public class ProviderManagerTest {
 
     /**
      * This test should be run in a clean (e.g. forked) VM
+     * @throws Exception if exception.
      */
     @Test
     public void shouldInitializeSmackTest() throws Exception {

smack-core/src/test/java/org/jivesoftware/smack/util/DnsUtilTest.java

@@ -25,6 +25,7 @@ import org.junit.Test;
 
 public class DnsUtilTest {
 
+    @SuppressWarnings("UnnecessaryAnonymousClass")
     private static final SmackDaneProvider DNS_UTIL_TEST_DANE_PROVIDER = new SmackDaneProvider() {
         @Override
         public SmackDaneVerifier newInstance() {

smack-core/src/testFixtures/java/org/jivesoftware/smack/DummyConnection.java

@@ -150,6 +150,7 @@ public class DummyConnection extends AbstractXMPPConnection {
      * Returns the first stanza that's sent through {@link #sendStanza(Stanza)}
      * and that has not been returned by earlier calls to this method.
      *
+     * @param <P> the top level stream element class.
      * @return a sent packet.
      */
     public <P extends TopLevelStreamElement> P getSentPacket() {
@@ -162,6 +163,8 @@ public class DummyConnection extends AbstractXMPPConnection {
      * method will block for up to the specified number of seconds if no packets
      * have been sent yet.
      *
+     * @param wait how long to wait in seconds.
+     * @param <P> the top level stream element class.
      * @return a sent packet.
      */
     @SuppressWarnings("unchecked")
@@ -222,6 +225,7 @@ public class DummyConnection extends AbstractXMPPConnection {
                         ConnectionConfiguration.Builder<Builder, DummyConnectionConfiguration> {
 
             private Builder() {
+                setSecurityMode(SecurityMode.disabled);
             }
 
             @Override

smack-experimental/src/main/java/org/jivesoftware/smackx/carbons/packet/CarbonExtension.java

@@ -18,6 +18,7 @@ package org.jivesoftware.smackx.carbons.packet;
 
 import org.jivesoftware.smack.packet.ExtensionElement;
 import org.jivesoftware.smack.packet.Message;
+import org.jivesoftware.smack.packet.MessageBuilder;
 import org.jivesoftware.smack.util.XmlStringBuilder;
 
 import org.jivesoftware.smackx.forward.packet.Forwarded;
@@ -158,8 +159,21 @@ public class CarbonExtension implements ExtensionElement {
          * Marks a message "private", so that it will not be carbon-copied, by adding private packet
          * extension to the message.
          *
-         * @param message the message to add the private extension to
+         * @param messageBuilder the message to add the private extension to
          */
+        public static void addTo(MessageBuilder messageBuilder) {
+            messageBuilder.addExtension(INSTANCE);
+        }
+
+        /**
+         * Marks a message "private", so that it will not be carbon-copied, by adding private packet
+         * extension to the message.
+         *
+         * @param message the message to add the private extension to
+         * @deprecated use {@link #addTo(MessageBuilder)} instead.
+         */
+        // TODO: Remove in Smack 4.6
+        @Deprecated
         public static void addTo(Message message) {
             message.addExtension(INSTANCE);
         }

smack-experimental/src/main/java/org/jivesoftware/smackx/fallback_indication/FallbackIndicationManager.java

@@ -25,7 +25,6 @@ import org.jivesoftware.smack.AsyncButOrdered;
 import org.jivesoftware.smack.ConnectionCreationListener;
 import org.jivesoftware.smack.Manager;
 import org.jivesoftware.smack.SmackException;
-import org.jivesoftware.smack.StanzaListener;
 import org.jivesoftware.smack.XMPPConnection;
 import org.jivesoftware.smack.XMPPConnectionRegistry;
 import org.jivesoftware.smack.XMPPException;
@@ -68,23 +67,20 @@ public final class FallbackIndicationManager extends Manager {
     private final StanzaFilter fallbackIndicationElementFilter = new AndFilter(StanzaTypeFilter.MESSAGE,
             new StanzaExtensionFilter(FallbackIndicationElement.ELEMENT, FallbackIndicationElement.NAMESPACE));
 
-    private final StanzaListener fallbackIndicationElementListener = new StanzaListener() {
-        @Override
-        public void processStanza(Stanza packet) {
-            Message message = (Message) packet;
-            FallbackIndicationElement indicator = FallbackIndicationElement.fromMessage(message);
-            String body = message.getBody();
-            asyncButOrdered.performAsyncButOrdered(message.getFrom().asBareJid(), () -> {
-                for (FallbackIndicationListener l : listeners) {
-                    l.onFallbackIndicationReceived(message, indicator, body);
-                }
-            });
-        }
-    };
+    private void fallbackIndicationElementListener(Stanza packet) {
+        Message message = (Message) packet;
+        FallbackIndicationElement indicator = FallbackIndicationElement.fromMessage(message);
+        String body = message.getBody();
+        asyncButOrdered.performAsyncButOrdered(message.getFrom().asBareJid(), () -> {
+            for (FallbackIndicationListener l : listeners) {
+                l.onFallbackIndicationReceived(message, indicator, body);
+            }
+        });
+    }
 
     private FallbackIndicationManager(XMPPConnection connection) {
         super(connection);
-        connection.addAsyncStanzaListener(fallbackIndicationElementListener, fallbackIndicationElementFilter);
+        connection.addAsyncStanzaListener(this::fallbackIndicationElementListener, fallbackIndicationElementFilter);
         ServiceDiscoveryManager.getInstanceFor(connection).addFeature(FallbackIndicationElement.NAMESPACE);
     }
 
@@ -139,7 +135,7 @@ public final class FallbackIndicationManager extends Manager {
      * @param fallbackMessageBody fallback message body
      * @return builder with set body and added fallback element
      */
-    public MessageBuilder addFallbackIndicationWithBody(MessageBuilder messageBuilder, String fallbackMessageBody) {
+    public static MessageBuilder addFallbackIndicationWithBody(MessageBuilder messageBuilder, String fallbackMessageBody) {
         return addFallbackIndication(messageBuilder).setBody(fallbackMessageBody);
     }
 
@@ -149,7 +145,7 @@ public final class FallbackIndicationManager extends Manager {
      * @param messageBuilder message builder
      * @return message builder with added fallback element
      */
-    public MessageBuilder addFallbackIndication(MessageBuilder messageBuilder) {
+    public static MessageBuilder addFallbackIndication(MessageBuilder messageBuilder) {
         return messageBuilder.addExtension(new FallbackIndicationElement());
     }
 

smack-experimental/src/main/java/org/jivesoftware/smackx/httpfileupload/HttpFileUploadManager.java

@@ -37,7 +37,6 @@ import javax.net.ssl.HttpsURLConnection;
 import javax.net.ssl.SSLContext;
 import javax.net.ssl.SSLSocketFactory;
 
-import org.jivesoftware.smack.ConnectionConfiguration;
 import org.jivesoftware.smack.ConnectionCreationListener;
 import org.jivesoftware.smack.ConnectionListener;
 import org.jivesoftware.smack.Manager;
@@ -307,7 +306,9 @@ public final class HttpFileUploadManager extends Manager {
     public URL uploadFile(InputStream inputStream, String fileName, long fileSize, UploadProgressListener listener) throws XMPPErrorException, InterruptedException, SmackException, IOException {
         Objects.requireNonNull(inputStream, "Input Stream cannot be null");
         Objects.requireNonNull(fileName, "Filename Stream cannot be null");
-        Objects.requireNonNull(fileSize, "Filesize Stream cannot be null");
+        if (fileSize < 0) {
+            throw new IllegalArgumentException("File size cannot be negative");
+        }
         final Slot slot = requestSlot(fileName, fileSize, "application/octet-stream");
         upload(inputStream, fileSize, slot, listener);
         return slot.getGetUrl();
@@ -324,8 +325,7 @@ public final class HttpFileUploadManager extends Manager {
      *         supported by the service.
      * @throws InterruptedException if the calling thread was interrupted.
      * @throws XMPPException.XMPPErrorException if there was an XMPP error returned.
-     * @throws SmackException.NotConnectedException if the XMPP connection is not connected.
-     * @throws SmackException.NoResponseException if there was no response from the remote entity.
+     * @throws SmackException if smack exception.
      */
     public Slot requestSlot(String filename, long fileSize) throws InterruptedException,
             XMPPException.XMPPErrorException, SmackException {
@@ -348,7 +348,7 @@ public final class HttpFileUploadManager extends Manager {
      * @throws SmackException.NotConnectedException if the XMPP connection is not connected.
      * @throws InterruptedException if the calling thread was interrupted.
      * @throws XMPPException.XMPPErrorException if there was an XMPP error returned.
-     * @throws SmackException.NoResponseException if there was no response from the remote entity.
+     * @throws SmackException if smack exception.
      */
     public Slot requestSlot(String filename, long fileSize, String contentType) throws SmackException,
             InterruptedException, XMPPException.XMPPErrorException {
@@ -427,11 +427,6 @@ public final class HttpFileUploadManager extends Manager {
         this.tlsSocketFactory = tlsContext.getSocketFactory();
     }
 
-    public void useTlsSettingsFrom(ConnectionConfiguration connectionConfiguration) {
-        SSLContext sslContext = connectionConfiguration.getCustomSSLContext();
-        setTlsContext(sslContext);
-    }
-
     private void upload(InputStream iStream, long fileSize, Slot slot, UploadProgressListener listener) throws IOException {
         final URL putUrl = slot.getPutUrl();
 

smack-experimental/src/main/java/org/jivesoftware/smackx/mam/element/MamElements.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2016 Florian Schmaus and Fernando Ramirez
+ * Copyright © 2016-2020 Florian Schmaus and Fernando Ramirez
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,7 +38,7 @@ import org.jxmpp.jid.Jid;
  */
 public class MamElements {
 
-    public static final String NAMESPACE = "urn:xmpp:mam:1";
+    public static final String NAMESPACE = "urn:xmpp:mam:2";
 
     /**
      * MAM result extension class.

smack-experimental/src/main/java/org/jivesoftware/smackx/message_retraction/MessageRetractionManager.java

@@ -102,7 +102,7 @@ public final class MessageRetractionManager extends Manager {
      * @param retractedMessageId {@link OriginIdElement OriginID} of the message that the user wants to retract
      * @param carrierMessageBuilder message used to transmit the message retraction to the recipient
      */
-    public void addRetractionElementToMessage(OriginIdElement retractedMessageId, MessageBuilder carrierMessageBuilder) {
+    public static void addRetractionElementToMessage(OriginIdElement retractedMessageId, MessageBuilder carrierMessageBuilder) {
         FasteningElement fasteningElement = FasteningElement.builder()
                 .setOriginId(retractedMessageId)
                 .addWrappedPayload(new RetractElement())

smack-experimental/src/main/java/org/jivesoftware/smackx/sid/StableUniqueStanzaIdManager.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2018 Paul Schaub
+ * Copyright 2018 Paul Schaub, 2020 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -29,10 +29,6 @@ import org.jivesoftware.smack.filter.NotFilter;
 import org.jivesoftware.smack.filter.StanzaExtensionFilter;
 import org.jivesoftware.smack.filter.StanzaFilter;
 import org.jivesoftware.smack.filter.ToTypeFilter;
-import org.jivesoftware.smack.packet.Message;
-import org.jivesoftware.smack.packet.MessageBuilder;
-import org.jivesoftware.smack.util.Consumer;
-import org.jivesoftware.smack.util.Predicate;
 
 import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
 import org.jivesoftware.smackx.sid.element.OriginIdElement;
@@ -62,14 +58,8 @@ public final class StableUniqueStanzaIdManager extends Manager {
     // Filter that filters for messages with an origin id
     private static final StanzaFilter ORIGIN_ID_FILTER = new StanzaExtensionFilter(OriginIdElement.ELEMENT, NAMESPACE);
 
-    // Listener for outgoing stanzas that adds origin-ids to outgoing stanzas.
-    private static final Consumer<MessageBuilder> ADD_ORIGIN_ID_INTERCEPTOR = mb -> OriginIdElement.addOriginId(mb);
-
     // We need a filter for outgoing messages that do not carry an origin-id already.
     private static final StanzaFilter ADD_ORIGIN_ID_FILTER = new AndFilter(OUTGOING_FILTER, new NotFilter(ORIGIN_ID_FILTER));
-    private static final Predicate<Message> ADD_ORIGIN_ID_PREDICATE = m -> {
-        return ADD_ORIGIN_ID_FILTER.accept(m);
-    };
 
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
@@ -113,7 +103,7 @@ public final class StableUniqueStanzaIdManager extends Manager {
      * Start appending origin-id elements to outgoing stanzas and add the feature to disco.
      */
     public synchronized void enable() {
-        connection().addMessageInterceptor(ADD_ORIGIN_ID_INTERCEPTOR, ADD_ORIGIN_ID_PREDICATE);
+        connection().addMessageInterceptor(OriginIdElement::addTo, ADD_ORIGIN_ID_FILTER::accept);
         ServiceDiscoveryManager.getInstanceFor(connection()).addFeature(NAMESPACE);
     }
 
@@ -122,7 +112,7 @@ public final class StableUniqueStanzaIdManager extends Manager {
      */
     public synchronized void disable() {
         ServiceDiscoveryManager.getInstanceFor(connection()).removeFeature(NAMESPACE);
-        connection().removeMessageInterceptor(ADD_ORIGIN_ID_INTERCEPTOR);
+        connection().removeMessageInterceptor(OriginIdElement::addTo);
     }
 
     /**

smack-experimental/src/main/java/org/jivesoftware/smackx/sid/element/OriginIdElement.java

@@ -39,7 +39,7 @@ public class OriginIdElement extends StableAndUniqueIdElement {
      *
      * @param message message.
      * @return the added origin-id element.
-     * @deprecated use {@link #addOriginId(MessageBuilder)} instead.
+     * @deprecated use {@link #addTo(MessageBuilder)} instead.
      */
     @Deprecated
     // TODO: Remove in Smack 4.5.
@@ -57,7 +57,7 @@ public class OriginIdElement extends StableAndUniqueIdElement {
      * @param messageBuilder the message builder to add an origin ID to.
      * @return the added origin-id element.
      */
-    public static OriginIdElement addOriginId(MessageBuilder messageBuilder) {
+    public static OriginIdElement addTo(MessageBuilder messageBuilder) {
         OriginIdElement originId = new OriginIdElement();
         messageBuilder.addExtension(originId);
         // TODO: Find solution to have both the originIds stanzaId and a nice to look at incremental stanzaID.

smack-experimental/src/main/resources/org.jivesoftware.smack.experimental/experimental.providers

@@ -17,22 +17,22 @@
     <!-- XEP-0313: Message Archive Management -->
     <iqProvider>
         <elementName>prefs</elementName>
-        <namespace>urn:xmpp:mam:1</namespace>
+        <namespace>urn:xmpp:mam:2</namespace>
         <className>org.jivesoftware.smackx.mam.provider.MamPrefsIQProvider</className>
     </iqProvider>
     <iqProvider>
         <elementName>query</elementName>
-        <namespace>urn:xmpp:mam:1</namespace>
+        <namespace>urn:xmpp:mam:2</namespace>
         <className>org.jivesoftware.smackx.mam.provider.MamQueryIQProvider</className>
     </iqProvider>
     <iqProvider>
         <elementName>fin</elementName>
-        <namespace>urn:xmpp:mam:1</namespace>
+        <namespace>urn:xmpp:mam:2</namespace>
         <className>org.jivesoftware.smackx.mam.provider.MamFinIQProvider</className>
     </iqProvider>
     <extensionProvider>
         <elementName>result</elementName>
-        <namespace>urn:xmpp:mam:1</namespace>
+        <namespace>urn:xmpp:mam:2</namespace>
         <className>org.jivesoftware.smackx.mam.provider.MamResultProvider</className>
     </extensionProvider>
 

smack-experimental/src/test/java/org/jivesoftware/smackx/fallback_indication/FallbackIndicationTest.java

@@ -20,7 +20,7 @@ import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertNull;
 
 import org.jivesoftware.smack.packet.Message;
-import org.jivesoftware.smack.packet.MessageBuilder;
+import org.jivesoftware.smack.packet.StanzaBuilder;
 
 import org.jivesoftware.smackx.fallback_indication.element.FallbackIndicationElement;
 
@@ -30,11 +30,11 @@ public class FallbackIndicationTest {
 
     @Test
     public void testFallbackIndicationElementFromMessageTest() {
-        Message messageWithoutFallback = MessageBuilder.buildMessage()
+        Message messageWithoutFallback = StanzaBuilder.buildMessage()
                         .build();
         assertNull(FallbackIndicationElement.fromMessage(messageWithoutFallback));
 
-        Message messageWithFallback = MessageBuilder.buildMessage()
+        Message messageWithFallback = StanzaBuilder.buildMessage()
                         .addExtension(new FallbackIndicationElement())
                         .build();
         assertNotNull(FallbackIndicationElement.fromMessage(messageWithFallback));

smack-experimental/src/test/java/org/jivesoftware/smackx/mam/MamFinProviderTest.java

@@ -34,7 +34,7 @@ import org.junit.jupiter.api.Test;
 
 public class MamFinProviderTest extends MamTest {
 
-    static final String exmapleMamFinXml = "<fin xmlns='urn:xmpp:mam:1' stable='true'>"
+    static final String exmapleMamFinXml = "<fin xmlns='urn:xmpp:mam:2' stable='true'>"
             + "<set xmlns='http://jabber.org/protocol/rsm'>" + "<max>10</max>" + "<after>09af3-cc343-b409f</after>"
             + "</set>" + "</fin>";
 
@@ -56,7 +56,7 @@ public class MamFinProviderTest extends MamTest {
     public void checkQueryLimitedResults() throws Exception {
         // @formatter:off
         final String IQ_LIMITED_RESULTS_EXAMPLE = "<iq type='result' id='u29303'>"
-                        + "<fin xmlns='urn:xmpp:mam:1' complete='true'>"
+                        + "<fin xmlns='urn:xmpp:mam:2' complete='true'>"
                         + "<set xmlns='http://jabber.org/protocol/rsm'>"
                         + "<first index='0'>23452-4534-1</first>"
                         + "<last>390-2342-22</last>" + "<count>16</count>"

smack-experimental/src/test/java/org/jivesoftware/smackx/mam/MamPrefIQProviderTest.java

@@ -33,19 +33,19 @@ import org.jxmpp.jid.Jid;
 
 public class MamPrefIQProviderTest extends MamTest {
 
-    private static final String exampleMamPrefsIQ1 = "<iq type='set' id='juliet3'>" + "<prefs xmlns='urn:xmpp:mam:1' default='roster'>"
+    private static final String exampleMamPrefsIQ1 = "<iq type='set' id='juliet3'>" + "<prefs xmlns='urn:xmpp:mam:2' default='roster'>"
             + "<always>" + "<jid>romeo@montague.lit</jid>" + "</always>" + "<never>"
             + "<jid>montague@montague.lit</jid>" + "</never>" + "</prefs>" + "</iq>";
 
-    private static final String exampleMamPrefsIQ2 = "<iq type='set' id='juliet3'>" + "<prefs xmlns='urn:xmpp:mam:1' default='roster'>"
+    private static final String exampleMamPrefsIQ2 = "<iq type='set' id='juliet3'>" + "<prefs xmlns='urn:xmpp:mam:2' default='roster'>"
             + "<always>" + "<jid>romeo@montague.lit</jid>" + "<jid>montague@montague.lit</jid>" + "</always>"
             + "<never>" + "</never>" + "</prefs>" + "</iq>";
 
-    private static final String exampleMamPrefsIQ3 = "<iq type='get' id='juliet3'>" + "<prefs xmlns='urn:xmpp:mam:1'>" + "</prefs>"
+    private static final String exampleMamPrefsIQ3 = "<iq type='get' id='juliet3'>" + "<prefs xmlns='urn:xmpp:mam:2'>" + "</prefs>"
             + "</iq>";
 
     private static final String exampleMamPrefsResultIQ = "<iq type='result' id='juliet3'>"
-            + "<prefs xmlns='urn:xmpp:mam:1' default='roster'>" + "<always>" + "<jid>romeo@montague.lit</jid>"
+            + "<prefs xmlns='urn:xmpp:mam:2' default='roster'>" + "<always>" + "<jid>romeo@montague.lit</jid>"
             + "</always>" + "<never>" + "<jid>sarasa@montague.lit</jid>" + "<jid>montague@montague.lit</jid>"
             + "</never>" + "</prefs>" + "</iq>";
 

smack-experimental/src/test/java/org/jivesoftware/smackx/mam/MamQueryIQProviderTest.java

@@ -35,18 +35,18 @@ import org.junit.jupiter.api.Test;
 
 public class MamQueryIQProviderTest {
 
-    private static final String exampleMamQueryIQ1 = "<iq type='set' id='query4'>" + "<query xmlns='urn:xmpp:mam:1' queryid='test'>"
+    private static final String exampleMamQueryIQ1 = "<iq type='set' id='query4'>" + "<query xmlns='urn:xmpp:mam:2' queryid='test'>"
             + "<x xmlns='jabber:x:data' type='submit'>" + "<field type='hidden' var='FORM_TYPE'>"
-            + "<value>urn:xmpp:mam:1</value>" + "</field>"
+            + "<value>urn:xmpp:mam:2</value>" + "</field>"
             + "<field type='text-single' var='urn:example:xmpp:free-text-search'>"
             + "<value>Where arth thou, my Juliet?</value>" + "</field>"
             + "<field type='text-single' var='urn:example:xmpp:stanza-content'>"
             + "<value>{http://jabber.org/protocol/mood}mood/lonely</value>" + "</field>" + "</x>" + "</query>"
             + "</iq>";
 
-    private static final String exampleMamQueryIQ2 = "<iq type='result' id='form1'>" + "<query xmlns='urn:xmpp:mam:1'>"
+    private static final String exampleMamQueryIQ2 = "<iq type='result' id='form1'>" + "<query xmlns='urn:xmpp:mam:2'>"
             + "<x xmlns='jabber:x:data' type='form'>" + "<field type='hidden' var='FORM_TYPE'>"
-            + "<value>urn:xmpp:mam:1</value>" + "</field>" + "<field type='jid-single' var='with'/>"
+            + "<value>urn:xmpp:mam:2</value>" + "</field>" + "<field type='jid-single' var='with'/>"
             + "<field type='text-single' var='start'/>" + "<field type='text-single' var='end'/>"
             + "<field type='text-single' var='urn:example:xmpp:free-text-search'/>"
             + "<field type='text-single' var='urn:example:xmpp:stanza-content'/>" + "</x>" + "</query>" + "</iq>";
@@ -80,7 +80,7 @@ public class MamQueryIQProviderTest {
         assertEquals(dataForm2.getType(), DataForm.Type.form);
 
         List<FormField> fields2 = dataForm2.getFields();
-        assertEquals(fields2.get(0).getValues().get(0).toString(), "urn:xmpp:mam:1");
+        assertEquals(fields2.get(0).getValues().get(0).toString(), "urn:xmpp:mam:2");
         assertTrue(fields2.get(0).getValues().size() == 1);
         assertEquals(fields2.get(1).getType(), FormField.Type.jid_single);
         assertEquals(fields2.get(2).getType(), FormField.Type.text_single);

smack-experimental/src/test/java/org/jivesoftware/smackx/mam/MamResultProviderTest.java

@@ -34,7 +34,7 @@ import org.junit.jupiter.api.Test;
 
 public class MamResultProviderTest {
 
-    private static final String exampleMamResultXml = "<result xmlns='urn:xmpp:mam:1' queryid='f27' id='28482-98726-73623'>"
+    private static final String exampleMamResultXml = "<result xmlns='urn:xmpp:mam:2' queryid='f27' id='28482-98726-73623'>"
             + "<forwarded xmlns='urn:xmpp:forward:0'>" + "<delay xmlns='urn:xmpp:delay' stamp='2010-07-10T23:08:25Z'/>"
             + "<message xmlns='jabber:client' to='juliet@capulet.lit/balcony' from='romeo@montague.lit/orchard' "
             + "type='chat'>"
@@ -42,7 +42,7 @@ public class MamResultProviderTest {
             + "</message>" + "</forwarded>" + "</result>";
 
     private static final String exampleResultMessage = "<message id='aeb213' to='juliet@capulet.lit/chamber'>"
-            + "<result xmlns='urn:xmpp:mam:1' queryid='f27' id='28482-98726-73623'>"
+            + "<result xmlns='urn:xmpp:mam:2' queryid='f27' id='28482-98726-73623'>"
             + "<forwarded xmlns='urn:xmpp:forward:0'>" + "<delay xmlns='urn:xmpp:delay' stamp='2010-07-10T23:08:25Z'/>"
             + "<message xmlns='jabber:client' from='witch@shakespeare.lit' to='macbeth@shakespeare.lit'>"
             + "<body>Hail to thee</body>" + "</message>" + "</forwarded>" + "</result>" + "</message>";

smack-experimental/src/test/java/org/jivesoftware/smackx/mam/PagingTest.java

@@ -29,9 +29,9 @@ import org.junit.jupiter.api.Test;
 
 public class PagingTest extends MamTest {
 
-    private static final String pagingStanza = "<iq id='sarasa' type='set'>" + "<query xmlns='urn:xmpp:mam:1' queryid='testid'>"
+    private static final String pagingStanza = "<iq id='sarasa' type='set'>" + "<query xmlns='urn:xmpp:mam:2' queryid='testid'>"
             + "<x xmlns='jabber:x:data' type='submit'>" + "<field var='FORM_TYPE'>"
-            + "<value>urn:xmpp:mam:1</value>" + "</field>" + "</x>" + "<set xmlns='http://jabber.org/protocol/rsm'>"
+            + "<value>urn:xmpp:mam:2</value>" + "</field>" + "</x>" + "<set xmlns='http://jabber.org/protocol/rsm'>"
             + "<max>10</max>" + "</set>" + "</query>" + "</iq>";
 
     @Test
@@ -46,7 +46,7 @@ public class PagingTest extends MamTest {
         mamQueryIQ.addExtension(rsmSet);
 
         assertEquals(mamQueryIQ.getDataForm(), dataForm);
-        assertEquals(mamQueryIQ.getDataForm().getFields().get(0).getValues().get(0).toString(), "urn:xmpp:mam:1");
+        assertEquals(mamQueryIQ.getDataForm().getFields().get(0).getValues().get(0).toString(), "urn:xmpp:mam:2");
         assertEquals(pagingStanza, mamQueryIQ.toXML(StreamOpen.CLIENT_NAMESPACE).toString());
     }
 

smack-experimental/src/test/java/org/jivesoftware/smackx/mam/QueryArchiveTest.java

@@ -40,12 +40,12 @@ import org.jxmpp.jid.impl.JidCreate;
 
 public class QueryArchiveTest extends MamTest {
 
-    private static final String mamSimpleQueryIQ = "<iq id='sarasa' type='set'>" + "<query xmlns='urn:xmpp:mam:1' queryid='testid'>"
+    private static final String mamSimpleQueryIQ = "<iq id='sarasa' type='set'>" + "<query xmlns='urn:xmpp:mam:2' queryid='testid'>"
             + "<x xmlns='jabber:x:data' type='submit'>" + "<field var='FORM_TYPE'>" + "<value>"
             + MamElements.NAMESPACE + "</value>" + "</field>" + "</x>" + "</query>" + "</iq>";
 
     private static final String mamQueryResultExample = "<message to='hag66@shakespeare.lit/pda' from='coven@chat.shakespeare.lit' id='iasd207'>"
-            + "<result xmlns='urn:xmpp:mam:1' queryid='g27' id='34482-21985-73620'>"
+            + "<result xmlns='urn:xmpp:mam:2' queryid='g27' id='34482-21985-73620'>"
             + "<forwarded xmlns='urn:xmpp:forward:0'>"
             + "<delay xmlns='urn:xmpp:delay' stamp='2002-10-13T23:58:37.000+00:00'/>" + "<message "
             + "xmlns='jabber:client' from='coven@chat.shakespeare.lit/firstwitch' " + "id='162BEBB1-F6DB-4D9A-9BD8-CFDCC801A0B2' "

smack-experimental/src/test/java/org/jivesoftware/smackx/mam/ResultsLimitTest.java

@@ -30,7 +30,7 @@ import org.junit.jupiter.api.Test;
 
 public class ResultsLimitTest extends MamTest {
 
-    private static final String resultsLimitStanza = "<iq id='sarasa' type='set'>" + "<query xmlns='urn:xmpp:mam:1' queryid='testid'>"
+    private static final String resultsLimitStanza = "<iq id='sarasa' type='set'>" + "<query xmlns='urn:xmpp:mam:2' queryid='testid'>"
             + "<x xmlns='jabber:x:data' type='submit'>" + "<field var='FORM_TYPE'>" + "<value>"
             + MamElements.NAMESPACE + "</value>" + "</field>" + "</x>" + "<set xmlns='http://jabber.org/protocol/rsm'>"
             + "<max>10</max>" + "</set>" + "</query>" + "</iq>";

smack-experimental/src/test/java/org/jivesoftware/smackx/message_fastening/MessageFasteningElementsTest.java

@@ -29,6 +29,7 @@ import java.util.Arrays;
 
 import org.jivesoftware.smack.packet.MessageBuilder;
 import org.jivesoftware.smack.packet.StandardExtensionElement;
+import org.jivesoftware.smack.packet.StanzaBuilder;
 import org.jivesoftware.smack.packet.StanzaFactory;
 import org.jivesoftware.smack.packet.id.StandardStanzaIdSource;
 import org.jivesoftware.smack.parsing.SmackParsingException;
@@ -166,10 +167,10 @@ public class MessageFasteningElementsTest {
 
     @Test
     public void hasFasteningElementTest() {
-        MessageBuilder messageBuilderWithFasteningElement = MessageBuilder.buildMessage()
+        MessageBuilder messageBuilderWithFasteningElement = StanzaBuilder.buildMessage()
                 .setBody("Hi!")
                 .addExtension(FasteningElement.builder().setOriginId("origin-id-1").build());
-        MessageBuilder messageBuilderWithoutFasteningElement = MessageBuilder.buildMessage()
+        MessageBuilder messageBuilderWithoutFasteningElement = StanzaBuilder.buildMessage()
                 .setBody("Ho!");
 
         assertTrue(FasteningElement.hasFasteningElement(messageBuilderWithFasteningElement));

smack-experimental/src/test/java/org/jivesoftware/smackx/sid/StableUniqueStanzaIdTest.java

@@ -78,7 +78,7 @@ public class StableUniqueStanzaIdTest extends SmackTestSuite {
         assertFalse(OriginIdElement.hasOriginId(message));
         assertFalse(StanzaIdElement.hasStanzaId(message));
 
-        OriginIdElement.addOriginId(messageBuilder);
+        OriginIdElement.addTo(messageBuilder);
 
         message = messageBuilder.build();
         assertTrue(OriginIdElement.hasOriginId(message));

smack-extensions/src/main/java/org/jivesoftware/smackx/caps/EntityCapsManager.java

@@ -33,8 +33,6 @@ import java.util.SortedSet;
 import java.util.TreeSet;
 import java.util.WeakHashMap;
 import java.util.concurrent.ConcurrentLinkedQueue;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 import org.jivesoftware.smack.ConnectionCreationListener;
 import org.jivesoftware.smack.ConnectionListener;
@@ -51,13 +49,11 @@ import org.jivesoftware.smack.filter.PresenceTypeFilter;
 import org.jivesoftware.smack.filter.StanzaExtensionFilter;
 import org.jivesoftware.smack.filter.StanzaFilter;
 import org.jivesoftware.smack.filter.StanzaTypeFilter;
-import org.jivesoftware.smack.packet.IQ;
 import org.jivesoftware.smack.packet.Presence;
 import org.jivesoftware.smack.packet.PresenceBuilder;
 import org.jivesoftware.smack.packet.Stanza;
 import org.jivesoftware.smack.roster.AbstractPresenceEventListener;
 import org.jivesoftware.smack.roster.Roster;
-import org.jivesoftware.smack.util.Consumer;
 import org.jivesoftware.smack.util.StringUtils;
 import org.jivesoftware.smack.util.stringencoder.Base64;
 
@@ -87,7 +83,6 @@ import org.jxmpp.util.cache.LruCache;
  * @see <a href="http://www.xmpp.org/extensions/xep-0115.html">XEP-0115: Entity Capabilities</a>
  */
 public final class EntityCapsManager extends Manager {
-    private static final Logger LOGGER = Logger.getLogger(EntityCapsManager.class.getName());
 
     public static final String NAMESPACE = CapsExtension.NAMESPACE;
     public static final String ELEMENT = CapsExtension.ELEMENT;
@@ -307,7 +302,6 @@ public final class EntityCapsManager extends Manager {
 
     private boolean entityCapsEnabled;
     private CapsVersionAndHash currentCapsVersion;
-    private volatile Presence presenceSend;
 
     /**
      * The entity node String used by this EntityCapsManager instance.
@@ -317,11 +311,11 @@ public final class EntityCapsManager extends Manager {
     // Intercept presence packages and add caps data when intended.
     // XEP-0115 specifies that a client SHOULD include entity capabilities
     // with every presence notification it sends.
-    private final Consumer<PresenceBuilder> presenceInterceptor = presenceBuilder -> {
+    private void addCapsExtension(PresenceBuilder presenceBuilder) {
         CapsVersionAndHash capsVersionAndHash = getCapsVersionAndHash();
         CapsExtension caps = new CapsExtension(entityNode, capsVersionAndHash.version, capsVersionAndHash.hash);
         presenceBuilder.overrideExtension(caps);
-    };
+    }
 
     private EntityCapsManager(XMPPConnection connection) {
         super(connection);
@@ -342,11 +336,6 @@ public final class EntityCapsManager extends Manager {
                 // feature, so we try to process it after we are connected and
                 // once after we are authenticated.
                 processCapsStreamFeatureIfAvailable(connection);
-
-                // Reset presenceSend when the connection was not resumed
-                if (!resumed) {
-                    presenceSend = null;
-                }
             }
             private void processCapsStreamFeatureIfAvailable(XMPPConnection connection) {
                 CapsExtension capsExtension = connection.getFeature(
@@ -359,9 +348,6 @@ public final class EntityCapsManager extends Manager {
             }
         });
 
-        // This calculates the local entity caps version
-        updateLocalEntityCaps();
-
         if (autoEnableEntityCaps)
             enableEntityCaps();
 
@@ -387,26 +373,16 @@ public final class EntityCapsManager extends Manager {
             }
         });
 
-        connection.addStanzaSendingListener(new StanzaListener() {
-            @Override
-            public void processStanza(Stanza packet) {
-                presenceSend = (Presence) packet;
-            }
-        }, PresenceTypeFilter.OUTGOING_PRESENCE_BROADCAST);
-
-
-        enableEntityCaps();
-
         // It's important to do this as last action. Since it changes the
         // behavior of the SDM in some ways
         sdm.addEntityCapabilitiesChangedListener(new EntityCapabilitiesChangedListener() {
             @Override
-            public void onEntityCapailitiesChanged() {
+            public void onEntityCapabilitiesChanged(DiscoverInfo synthesizedDiscoveryInfo) {
                 if (!entityCapsEnabled()) {
                     return;
                 }
 
-                updateLocalEntityCaps();
+                updateLocalEntityCaps(synthesizedDiscoveryInfo);
             }
         });
     }
@@ -425,13 +401,12 @@ public final class EntityCapsManager extends Manager {
     }
 
     public synchronized void enableEntityCaps() {
-        connection().addPresenceInterceptor(presenceInterceptor, p -> {
+        connection().addPresenceInterceptor(this::addCapsExtension, p -> {
             return PresenceTypeFilter.AVAILABLE.accept(p);
         });
 
         // Add Entity Capabilities (XEP-0115) feature node.
         sdm.addFeature(NAMESPACE);
-        updateLocalEntityCaps();
         entityCapsEnabled = true;
     }
 
@@ -439,18 +414,13 @@ public final class EntityCapsManager extends Manager {
         entityCapsEnabled = false;
         sdm.removeFeature(NAMESPACE);
 
-        connection().removePresenceInterceptor(presenceInterceptor);
+        connection().removePresenceInterceptor(this::addCapsExtension);
     }
 
     public boolean entityCapsEnabled() {
         return entityCapsEnabled;
     }
 
-    public void setEntityNode(String entityNode) {
-        this.entityNode = entityNode;
-        updateLocalEntityCaps();
-    }
-
     /**
      * Remove a record telling what entity caps node a user has.
      *
@@ -522,13 +492,10 @@ public final class EntityCapsManager extends Manager {
      * presence is send to inform others about your new Entity Caps node string.
      *
      */
-    private void updateLocalEntityCaps() {
+    private void updateLocalEntityCaps(DiscoverInfo synthesizedDiscoveryInfo) {
         XMPPConnection connection = connection();
 
-        DiscoverInfoBuilder discoverInfoBuilder = DiscoverInfo.builder("synthetized-disco-info-response")
-                .ofType(IQ.Type.result);
-        sdm.addDiscoverInfoTo(discoverInfoBuilder);
-
+        DiscoverInfoBuilder discoverInfoBuilder = synthesizedDiscoveryInfo.asBuilder("synthesized-disco-info-result");
         // getLocalNodeVer() will return a result only after currentCapsVersion is set. Therefore
         // set it first and then call getLocalNodeVer()
         currentCapsVersion = generateVerificationString(discoverInfoBuilder);
@@ -564,20 +531,6 @@ public final class EntityCapsManager extends Manager {
                 return packetExtensions;
             }
         });
-
-        // Re-send the last sent presence, and let the stanza interceptor
-        // add a <c/> node to it.
-        // See http://xmpp.org/extensions/xep-0115.html#advertise
-        // We only send a presence packet if there was already one send
-        // to respect ConnectionConfiguration.isSendPresence()
-        if (connection != null && connection.isAuthenticated() && presenceSend != null) {
-            try {
-                connection.sendStanza(presenceSend.cloneWithNewId());
-            }
-            catch (InterruptedException | NotConnectedException e) {
-                LOGGER.log(Level.WARNING, "Could could not update presence with caps info", e);
-            }
-        }
     }
 
     /**

smack-extensions/src/main/java/org/jivesoftware/smackx/commands/AdHocCommandManager.java

@@ -517,7 +517,7 @@ public final class AdHocCommandManager extends Manager {
 
     private boolean sessionSweeperScheduled;
 
-    private final Runnable sessionSweeper = () -> {
+    private void sessionSweeper() {
         final long currentTime = System.currentTimeMillis();
         synchronized (this) {
             for (Iterator<Entry<String, LocalCommand>> it = executingCommands.entrySet().iterator(); it.hasNext();) {
@@ -553,7 +553,7 @@ public final class AdHocCommandManager extends Manager {
         }
 
         sessionSweeperScheduled = true;
-        schedule(sessionSweeper, 10, TimeUnit.SECONDS);
+        schedule(this::sessionSweeper, 10, TimeUnit.SECONDS);
     }
 
     /**

smack-extensions/src/main/java/org/jivesoftware/smackx/disco/EntityCapabilitiesChangedListener.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2018 Florian Schmaus.
+ * Copyright 2018-2020 Florian Schmaus.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,8 +16,10 @@
  */
 package org.jivesoftware.smackx.disco;
 
+import org.jivesoftware.smackx.disco.packet.DiscoverInfo;
+
 public interface EntityCapabilitiesChangedListener {
 
-    void onEntityCapailitiesChanged();
+    void onEntityCapabilitiesChanged(DiscoverInfo synthesizedDiscoveryInfo);
 
 }

smack-extensions/src/main/java/org/jivesoftware/smackx/disco/ServiceDiscoveryManager.java

@@ -16,6 +16,7 @@
  */
 package org.jivesoftware.smackx.disco;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -28,20 +29,30 @@ import java.util.Set;
 import java.util.WeakHashMap;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.CopyOnWriteArraySet;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import org.jivesoftware.smack.ConnectionCreationListener;
+import org.jivesoftware.smack.ConnectionListener;
 import org.jivesoftware.smack.Manager;
+import org.jivesoftware.smack.ScheduledAction;
 import org.jivesoftware.smack.SmackException.NoResponseException;
 import org.jivesoftware.smack.SmackException.NotConnectedException;
 import org.jivesoftware.smack.XMPPConnection;
 import org.jivesoftware.smack.XMPPConnectionRegistry;
 import org.jivesoftware.smack.XMPPException.XMPPErrorException;
+import org.jivesoftware.smack.filter.PresenceTypeFilter;
+import org.jivesoftware.smack.internal.AbstractStats;
 import org.jivesoftware.smack.iqrequest.AbstractIqRequestHandler;
 import org.jivesoftware.smack.iqrequest.IQRequestHandler.Mode;
 import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smack.packet.Presence;
 import org.jivesoftware.smack.packet.Stanza;
 import org.jivesoftware.smack.packet.StanzaError;
 import org.jivesoftware.smack.util.CollectionUtil;
+import org.jivesoftware.smack.util.ExtendedAppendable;
 import org.jivesoftware.smack.util.Objects;
 import org.jivesoftware.smack.util.StringUtils;
 
@@ -71,6 +82,8 @@ import org.jxmpp.util.cache.ExpirationCache;
  */
 public final class ServiceDiscoveryManager extends Manager {
 
+    private static final Logger LOGGER = Logger.getLogger(ServiceDiscoveryManager.class.getName());
+
     private static final String DEFAULT_IDENTITY_NAME = "Smack";
     private static final String DEFAULT_IDENTITY_CATEGORY = "client";
     private static final String DEFAULT_IDENTITY_TYPE = "pc";
@@ -91,6 +104,8 @@ public final class ServiceDiscoveryManager extends Manager {
     private List<DataForm> extendedInfos = new ArrayList<>(2);
     private final Map<String, NodeInformationProvider> nodeInformationProviders = new ConcurrentHashMap<>();
 
+    private volatile Presence presenceSend;
+
     // Create a new ServiceDiscoveryManager on every established connection
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
@@ -190,6 +205,18 @@ public final class ServiceDiscoveryManager extends Manager {
                 return response;
             }
         });
+
+        connection.addConnectionListener(new ConnectionListener() {
+            @Override
+            public void authenticated(XMPPConnection connection, boolean resumed) {
+                // Reset presenceSend when the connection was not resumed
+                if (!resumed) {
+                    presenceSend = null;
+                }
+            }
+        });
+        connection.addStanzaSendingListener(p -> presenceSend = (Presence) p,
+                        PresenceTypeFilter.OUTGOING_PRESENCE_BROADCAST);
     }
 
     /**
@@ -894,13 +921,55 @@ public final class ServiceDiscoveryManager extends Manager {
         return entityCapabilitiesChangedListeners.add(entityCapabilitiesChangedListener);
     }
 
+    private static final int RENEW_ENTITY_CAPS_DELAY_MILLIS = 25;
+
+    private ScheduledAction renewEntityCapsScheduledAction;
+
+    private final AtomicInteger renewEntityCapsPerformed = new AtomicInteger();
+    private int renewEntityCapsRequested = 0;
+    private int scheduledRenewEntityCapsAvoided = 0;
+
     /**
      * Notify the {@link EntityCapabilitiesChangedListener} about changed capabilities.
      */
-    private void renewEntityCapsVersion() {
-        for (EntityCapabilitiesChangedListener entityCapabilitiesChangedListener : entityCapabilitiesChangedListeners) {
-            entityCapabilitiesChangedListener.onEntityCapailitiesChanged();
+    private synchronized void renewEntityCapsVersion() {
+        renewEntityCapsRequested++;
+        if (renewEntityCapsScheduledAction != null) {
+            boolean canceled = renewEntityCapsScheduledAction.cancel();
+            if (canceled) {
+                scheduledRenewEntityCapsAvoided++;
+            }
         }
+
+        final XMPPConnection connection = connection();
+
+        renewEntityCapsScheduledAction = scheduleBlocking(() -> {
+            renewEntityCapsPerformed.incrementAndGet();
+
+            DiscoverInfoBuilder discoverInfoBuilder = DiscoverInfo.builder("synthetized-disco-info-response")
+                            .ofType(IQ.Type.result);
+            addDiscoverInfoTo(discoverInfoBuilder);
+            DiscoverInfo synthesizedDiscoveryInfo = discoverInfoBuilder.build();
+
+            for (EntityCapabilitiesChangedListener entityCapabilitiesChangedListener : entityCapabilitiesChangedListeners) {
+                entityCapabilitiesChangedListener.onEntityCapabilitiesChanged(synthesizedDiscoveryInfo);
+            }
+
+            // Re-send the last sent presence, and let the stanza interceptor
+            // add a <c/> node to it.
+            // See http://xmpp.org/extensions/xep-0115.html#advertise
+            // We only send a presence packet if there was already one send
+            // to respect ConnectionConfiguration.isSendPresence()
+            final Presence presenceSend = this.presenceSend;
+            if (connection.isAuthenticated() && presenceSend != null) {
+                try {
+                    connection.sendStanza(presenceSend.cloneWithNewId());
+                }
+                catch (InterruptedException | NotConnectedException e) {
+                    LOGGER.log(Level.WARNING, "Could could not update presence with caps info", e);
+                }
+            }
+        }, RENEW_ENTITY_CAPS_DELAY_MILLIS, TimeUnit.MILLISECONDS);
     }
 
     public static void addDiscoInfoLookupShortcutMechanism(DiscoInfoLookupShortcutMechanism discoInfoLookupShortcutMechanism) {
@@ -915,4 +984,30 @@ public final class ServiceDiscoveryManager extends Manager {
             discoInfoLookupShortcutMechanisms.remove(discoInfoLookupShortcutMechanism);
         }
     }
+
+    public synchronized Stats getStats() {
+        return new Stats(this);
+    }
+
+    public static final class Stats extends AbstractStats {
+
+        public final int renewEntityCapsRequested;
+        public final int renewEntityCapsPerformed;
+        public final int scheduledRenewEntityCapsAvoided;
+
+        private Stats(ServiceDiscoveryManager serviceDiscoveryManager) {
+            renewEntityCapsRequested = serviceDiscoveryManager.renewEntityCapsRequested;
+            renewEntityCapsPerformed = serviceDiscoveryManager.renewEntityCapsPerformed.get();
+            scheduledRenewEntityCapsAvoided = serviceDiscoveryManager.scheduledRenewEntityCapsAvoided;
+        }
+
+        @Override
+        public void appendStatsTo(ExtendedAppendable appendable) throws IOException {
+            StringUtils.appendHeading(appendable, "ServiceDiscoveryManager stats", '#').append('\n');
+            appendable.append("renew-entitycaps-requested: ").append(renewEntityCapsRequested).append('\n');
+            appendable.append("renew-entitycaps-performed: ").append(renewEntityCapsPerformed).append('\n');
+            appendable.append("scheduled-renew-entitycaps-avoided: ").append(scheduledRenewEntityCapsAvoided).append('\n');
+        }
+
+    }
 }

smack-extensions/src/main/java/org/jivesoftware/smackx/disco/packet/DiscoverInfo.java

@@ -299,8 +299,8 @@ public class DiscoverInfo extends IQ implements DiscoverInfoView, TypedCloneable
         return containsDuplicateFeatures;
     }
 
-    public DiscoverInfoBuilder asBuilder() {
-        return new DiscoverInfoBuilder(this);
+    public DiscoverInfoBuilder asBuilder(String stanzaId) {
+        return new DiscoverInfoBuilder(this, stanzaId);
     }
 
     // TODO: Deprecate in favor of asBuilder().

smack-extensions/src/main/java/org/jivesoftware/smackx/disco/packet/DiscoverInfoBuilder.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2019 Florian Schmaus
+ * Copyright 2019-2020 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -48,8 +48,8 @@ public class DiscoverInfoBuilder extends IqBuilder<DiscoverInfoBuilder, Discover
         super(stanzaId);
     }
 
-    public DiscoverInfoBuilder(DiscoverInfo discoverInfo) {
-        super(discoverInfo.getStanzaId());
+    public DiscoverInfoBuilder(DiscoverInfo discoverInfo, String stanzaId) {
+        super(discoverInfo, stanzaId);
         features.addAll(discoverInfo.getFeatures());
         identities.addAll(discoverInfo.getIdentities());
         node = discoverInfo.getNode();

smack-extensions/src/main/java/org/jivesoftware/smackx/pep/PepManager.java

@@ -253,7 +253,10 @@ public final class PepManager extends Manager {
      *
      * @param pepListener a roster exchange listener.
      * @return true if pepListener was added.
+     * @deprecated use {@link #addPepEventListener(String, Class, PepEventListener)} instead.
      */
+    // TODO: Remove in Smack 4.5
+    @Deprecated
     public boolean addPepListener(PepListener pepListener) {
         return pepListeners.add(pepListener);
     }
@@ -263,7 +266,10 @@ public final class PepManager extends Manager {
      *
      * @param pepListener a roster exchange listener.
      * @return true, if pepListener was removed.
+     * @deprecated use {@link #removePepEventListener(PepEventListener)} instead.
      */
+    // TODO: Remove in Smack 4.5.
+    @Deprecated
     public boolean removePepListener(PepListener pepListener) {
         return pepListeners.remove(pepListener);
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/ping/PingManager.java

@@ -390,7 +390,7 @@ public final class PingManager extends Manager {
             int nextPingIn = pingInterval - delta;
             LOGGER.fine("Scheduling ServerPingTask in " + nextPingIn + " seconds (pingInterval="
                             + pingInterval + ", delta=" + delta + ")");
-            nextAutomaticPing = schedule(pingServerRunnable, nextPingIn, TimeUnit.SECONDS);
+            nextAutomaticPing = schedule(this::pingServerIfNecessary, nextPingIn, TimeUnit.SECONDS);
         }
     }
 
@@ -467,13 +467,4 @@ public final class PingManager extends Manager {
             }
         });
     }
-
-    private final Runnable pingServerRunnable = new Runnable() {
-        @Override
-        public void run() {
-            LOGGER.fine("ServerPingTask run()");
-            pingServerIfNecessary();
-        }
-    };
-
 }

smack-extensions/src/main/java/org/jivesoftware/smackx/receipts/DeliveryReceiptManager.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2013-2014 Georg Lukas, 2015-2019 Florian Schmaus
+ * Copyright 2013-2014 Georg Lukas, 2015-2020 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,11 +38,9 @@ import org.jivesoftware.smack.filter.StanzaExtensionFilter;
 import org.jivesoftware.smack.filter.StanzaFilter;
 import org.jivesoftware.smack.filter.StanzaTypeFilter;
 import org.jivesoftware.smack.packet.Message;
-import org.jivesoftware.smack.packet.MessageBuilder;
 import org.jivesoftware.smack.packet.Stanza;
 import org.jivesoftware.smack.packet.StanzaBuilder;
 import org.jivesoftware.smack.roster.Roster;
-import org.jivesoftware.smack.util.Consumer;
 import org.jivesoftware.smack.util.StringUtils;
 
 import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
@@ -273,8 +271,6 @@ public final class DeliveryReceiptManager extends Manager {
                     );
                    // @formatter:on
 
-    private static final Consumer<MessageBuilder> AUTO_ADD_DELIVERY_RECEIPT_REQUESTS_LISTENER = mb -> DeliveryReceiptRequest.addTo(mb);
-
     /**
      * Enables automatic requests of delivery receipts for outgoing messages of
      * {@link org.jivesoftware.smack.packet.Message.Type#normal}, {@link org.jivesoftware.smack.packet.Message.Type#chat} or {@link org.jivesoftware.smack.packet.Message.Type#headline}, and
@@ -284,7 +280,7 @@ public final class DeliveryReceiptManager extends Manager {
      * @see #dontAutoAddDeliveryReceiptRequests()
      */
     public void autoAddDeliveryReceiptRequests() {
-        connection().addMessageInterceptor(AUTO_ADD_DELIVERY_RECEIPT_REQUESTS_LISTENER, m -> {
+        connection().addMessageInterceptor(DeliveryReceiptRequest::addTo, m -> {
             return MESSAGES_TO_REQUEST_RECEIPTS_FOR.accept(m);
         });
     }
@@ -296,7 +292,7 @@ public final class DeliveryReceiptManager extends Manager {
      * @see #autoAddDeliveryReceiptRequests()
      */
     public void dontAutoAddDeliveryReceiptRequests() {
-        connection().removeMessageInterceptor(AUTO_ADD_DELIVERY_RECEIPT_REQUESTS_LISTENER);
+        connection().removeMessageInterceptor(DeliveryReceiptRequest::addTo);
     }
 
     /**

smack-extensions/src/main/java/org/jivesoftware/smackx/softwareinfo/SoftwareInfoManager.java

@@ -16,18 +16,14 @@
  */
 package org.jivesoftware.smackx.softwareinfo;
 
-import java.io.IOException;
 import java.util.Map;
 import java.util.WeakHashMap;
 
 import org.jivesoftware.smack.Manager;
-import org.jivesoftware.smack.SmackException.FeatureNotSupportedException;
 import org.jivesoftware.smack.SmackException.NoResponseException;
 import org.jivesoftware.smack.SmackException.NotConnectedException;
 import org.jivesoftware.smack.XMPPConnection;
 import org.jivesoftware.smack.XMPPException.XMPPErrorException;
-import org.jivesoftware.smack.parsing.SmackParsingException;
-import org.jivesoftware.smack.xml.XmlPullParserException;
 import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
 import org.jivesoftware.smackx.disco.packet.DiscoverInfo;
 import org.jivesoftware.smackx.softwareinfo.form.SoftwareInfoForm;
@@ -44,11 +40,11 @@ import org.jxmpp.jid.Jid;
 */
 public final class SoftwareInfoManager extends Manager {
 
-    private static final String FEATURE = "http://jabber.org/protocol/disco";
     private static final Map<XMPPConnection, SoftwareInfoManager> INSTANCES = new WeakHashMap<>();
+
     private final ServiceDiscoveryManager serviceDiscoveryManager;
 
-    public static synchronized SoftwareInfoManager getInstanceFor (XMPPConnection connection) throws IOException, XmlPullParserException, SmackParsingException {
+    public static synchronized SoftwareInfoManager getInstanceFor (XMPPConnection connection) {
         SoftwareInfoManager manager = INSTANCES.get(connection);
         if (manager == null) {
             manager = new SoftwareInfoManager(connection);
@@ -57,25 +53,11 @@ public final class SoftwareInfoManager extends Manager {
         return manager;
     }
 
-    private SoftwareInfoManager(XMPPConnection connection) throws IOException, XmlPullParserException, SmackParsingException {
+    private SoftwareInfoManager(XMPPConnection connection) {
         super(connection);
         serviceDiscoveryManager = ServiceDiscoveryManager.getInstanceFor(connection);
     }
 
-    /**
-     * Returns true if the feature is supported by the Jid.
-     * <br>
-     * @param jid Jid to be checked for support
-     * @return boolean
-     * @throws NoResponseException if there was no response from the remote entity
-     * @throws XMPPErrorException if there was an XMPP error returned
-     * @throws NotConnectedException if the XMPP connection is not connected
-     * @throws InterruptedException if the calling thread was interrupted
-     */
-    public boolean isSupported(Jid jid) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
-        return serviceDiscoveryManager.supportsFeatures(jid, FEATURE);
-    }
-
     /**
      * Publishes the provided {@link SoftwareInfoForm} as an extended info.
      * <br>
@@ -86,20 +68,16 @@ public final class SoftwareInfoManager extends Manager {
     }
 
     /**
-     * Get SoftwareInfoForm from Jid provided.
-     * <br>
+     * Get Software Information from the provided XMPP address. Returns <code>null</code> in case the queried entity does not announce that information.
+     *
      * @param jid jid to get software information from
-     * @return {@link SoftwareInfoForm} Form containing software information
+     * @return {@link SoftwareInfoForm} Form containing software information or <code>null</code>.
      * @throws NoResponseException if there was no response from the remote entity
      * @throws XMPPErrorException if there was an XMPP error returned
      * @throws NotConnectedException if the XMPP connection is not connected
      * @throws InterruptedException if the calling thread was interrupted
-     * @throws FeatureNotSupportedException if the feature is not supported
      */
-    public SoftwareInfoForm fromJid(Jid jid) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException, FeatureNotSupportedException {
-        if (!isSupported(jid)) {
-            throw new FeatureNotSupportedException(SoftwareInfoForm.FORM_TYPE, jid);
-        }
+    public SoftwareInfoForm fromJid(Jid jid) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
         DiscoverInfo discoverInfo = serviceDiscoveryManager.discoverInfo(jid);
         DataForm dataForm = DataForm.from(discoverInfo, SoftwareInfoForm.FORM_TYPE);
         if (dataForm == null) {

smack-extensions/src/main/java/org/jivesoftware/smackx/usertune/element/UserTuneElement.java

@@ -186,8 +186,8 @@ public final class UserTuneElement implements ExtensionElement {
 
         /**
          * Artist is an optional element in UserTuneElement.
-         * @param artist.
-         * @return builder.
+         * @param artist the artist.
+         * @return a reference to this builder.
          */
         public Builder setArtist(String artist) {
             this.artist = artist;
@@ -196,8 +196,8 @@ public final class UserTuneElement implements ExtensionElement {
 
         /**
          * Length is an optional element in UserTuneElement.
-         * @param length.
-         * @return builder.
+         * @param length the length.
+         * @return a reference to this builder.
          */
         public Builder setLength(int length) {
             return setLength(UInt16.from(length));
@@ -205,8 +205,8 @@ public final class UserTuneElement implements ExtensionElement {
 
         /**
          * Length is an optional element in UserTuneElement.
-         * @param length.
-         * @return builder.
+         * @param length the length.
+         * @return a reference to this builder.
          */
         public Builder setLength(UInt16 length) {
             this.length = length;
@@ -215,8 +215,8 @@ public final class UserTuneElement implements ExtensionElement {
 
         /**
          * Rating is an optional element in UserTuneElement.
-         * @param rating.
-         * @return builder.
+         * @param rating the rating.
+         * @return a reference to this builder.
          */
         public Builder setRating(int rating) {
             this.rating = rating;
@@ -225,8 +225,8 @@ public final class UserTuneElement implements ExtensionElement {
 
         /**
          * Source is an optional element in UserTuneElement.
-         * @param source.
-         * @return builder.
+         * @param source the source.
+         * @return a reference to this builder.
          */
         public Builder setSource(String source) {
             this.source = source;
@@ -235,8 +235,8 @@ public final class UserTuneElement implements ExtensionElement {
 
         /**
          * Title is an optional element in UserTuneElement.
-         * @param title.
-         * @return builder.
+         * @param title the title.
+         * @return a reference to this builder.
          */
         public Builder setTitle(String title) {
             this.title = title;
@@ -245,8 +245,8 @@ public final class UserTuneElement implements ExtensionElement {
 
         /**
          * Track is an optional element in UserTuneElement.
-         * @param track.
-         * @return builder.
+         * @param track the track.
+         * @return a reference to this builder.
          */
         public Builder setTrack(String track) {
             this.track = track;
@@ -255,8 +255,8 @@ public final class UserTuneElement implements ExtensionElement {
 
         /**
          * URI is an optional element in UserTuneElement.
-         * @param uri.
-         * @return builder.
+         * @param uri the URI.
+         * @return a reference to this builder.
          */
         public Builder setUri(URI uri) {
             this.uri = uri;

smack-extensions/src/main/java/org/jivesoftware/smackx/xhtmlim/XHTMLManager.java

@@ -26,6 +26,8 @@ import org.jivesoftware.smack.XMPPConnection;
 import org.jivesoftware.smack.XMPPConnectionRegistry;
 import org.jivesoftware.smack.XMPPException.XMPPErrorException;
 import org.jivesoftware.smack.packet.Message;
+import org.jivesoftware.smack.packet.MessageBuilder;
+import org.jivesoftware.smack.packet.MessageView;
 
 import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
 import org.jivesoftware.smackx.xhtmlim.packet.XHTMLExtension;
@@ -57,7 +59,7 @@ public class XHTMLManager {
      * @param message an XHTML message
      * @return an Iterator for the bodies in the message or null if none.
      */
-    public static List<CharSequence> getBodies(Message message) {
+    public static List<CharSequence> getBodies(MessageView message) {
         XHTMLExtension xhtmlExtension = XHTMLExtension.from(message);
         if (xhtmlExtension != null)
             return xhtmlExtension.getBodies();
@@ -68,9 +70,29 @@ public class XHTMLManager {
     /**
      * Adds an XHTML body to the message.
      *
-     * @param message the message that will receive the XHTML body
+     * @param messageBuilder the message that will receive the XHTML body
      * @param xhtmlText the string to add as an XHTML body to the message
      */
+    public static void addBody(MessageBuilder messageBuilder, XHTMLText xhtmlText) {
+        XHTMLExtension xhtmlExtension = XHTMLExtension.from(messageBuilder);
+        if (xhtmlExtension == null) {
+            // Create an XHTMLExtension and add it to the message
+            xhtmlExtension = new XHTMLExtension();
+            messageBuilder.addExtension(xhtmlExtension);
+        }
+        // Add the required bodies to the message
+        xhtmlExtension.addBody(xhtmlText.toXML());
+    }
+
+    /**
+     * Adds an XHTML body to the message.
+     *
+     * @param message the message that will receive the XHTML body
+     * @param xhtmlText the string to add as an XHTML body to the message
+     * @deprecated use {@link #addBody(MessageBuilder, XHTMLText)} instead.
+     */
+    // TODO: Remove in Smack 4.6
+    @Deprecated
     public static void addBody(Message message, XHTMLText xhtmlText) {
         XHTMLExtension xhtmlExtension = XHTMLExtension.from(message);
         if (xhtmlExtension == null) {

smack-extensions/src/test/java/org/jivesoftware/smackx/bytestreams/socks5/Socks5ProxyTest.java

@@ -86,7 +86,7 @@ public class Socks5ProxyTest {
      * When inserting new network addresses to the proxy the order should remain in the order they
      * were inserted.
      *
-     * @throws UnknownHostException
+     * @throws UnknownHostException if unknown host.
      */
     @Test
     public void shouldPreserveAddressOrderOnInsertions() throws UnknownHostException {
@@ -114,7 +114,7 @@ public class Socks5ProxyTest {
      * When replacing network addresses of the proxy the order should remain in the order if the
      * given list.
      *
-     * @throws UnknownHostException
+     * @throws UnknownHostException if unknown host.
      */
     @Test
     public void shouldPreserveAddressOrderOnReplace() throws UnknownHostException {

smack-extensions/src/test/java/org/jivesoftware/smackx/xdatavalidation/DataValidationHelperTest.java

@@ -44,9 +44,8 @@ public class DataValidationHelperTest {
                         () -> element.checkConsistency(field));
         assertEquals("Field type 'jid-single' is not consistent with validation method 'basic'.", vce.getMessage());
 
-        IllegalArgumentException iae = assertThrows(IllegalArgumentException.class,
+        assertThrows(IllegalArgumentException.class,
                         () -> new ListRange(-1L, 1L));
-        assertEquals("unsigned 32-bit integers can't be negative", iae.getMessage());
 
         element.setListRange(new ListRange(10L, 100L));
         vce = assertThrows(ValidationConsistencyException.class, () -> element.checkConsistency(field));

smack-im/src/main/java/org/jivesoftware/smack/roster/rosterstore/DirectoryRosterStore.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2013-2015 the original author or authors
+ * Copyright 2013-2015 the original author or authors, 2020 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,7 +17,6 @@
 package org.jivesoftware.smack.roster.rosterstore;
 
 import java.io.File;
-import java.io.FileFilter;
 import java.io.FileNotFoundException;
 import java.io.FileReader;
 import java.io.IOException;
@@ -56,15 +55,10 @@ public final class DirectoryRosterStore implements RosterStore {
     private static final String STORE_ID = "DEFAULT_ROSTER_STORE";
     private static final Logger LOGGER = Logger.getLogger(DirectoryRosterStore.class.getName());
 
-    private static final FileFilter rosterDirFilter = new FileFilter() {
-
-        @Override
-        public boolean accept(File file) {
-            String name = file.getName();
-            return name.startsWith(ENTRY_PREFIX);
-        }
-
-    };
+    private static boolean rosterDirFilter(File file) {
+        String name = file.getName();
+        return name.startsWith(ENTRY_PREFIX);
+    }
 
     /**
      * @param baseDir TODO javadoc me please
@@ -122,7 +116,7 @@ public final class DirectoryRosterStore implements RosterStore {
     public List<Item> getEntries() {
         List<Item> entries = new ArrayList<>();
 
-        for (File file : fileDir.listFiles(rosterDirFilter)) {
+        for (File file : fileDir.listFiles(DirectoryRosterStore::rosterDirFilter)) {
             Item entry = readEntry(file);
             if (entry == null) {
                 // Roster directory store corrupt. Abort and signal this by returning null.
@@ -168,7 +162,7 @@ public final class DirectoryRosterStore implements RosterStore {
 
     @Override
     public boolean resetEntries(Collection<Item> items, String version) {
-        for (File file : fileDir.listFiles(rosterDirFilter)) {
+        for (File file : fileDir.listFiles(DirectoryRosterStore::rosterDirFilter)) {
             file.delete();
         }
         for (Item item : items) {

smack-im/src/test/java/org/jivesoftware/smack/roster/RosterTest.java

@@ -95,6 +95,8 @@ public class RosterTest extends InitSmackIm {
      * Test a simple roster initialization according to the example in
      * <a href="http://xmpp.org/rfcs/rfc3921.html#roster-login"
      *     >RFC3921: Retrieving One's Roster on Login</a>.
+     *
+     * @throws Exception in case of an exception.
      */
     @Test
     public void testSimpleRosterInitialization() throws Exception {
@@ -131,6 +133,8 @@ public class RosterTest extends InitSmackIm {
      * Test adding a roster item according to the example in
      * <a href="http://xmpp.org/rfcs/rfc3921.html#roster-add"
      *     >RFC3921: Adding a Roster Item</a>.
+     *
+     * @throws Throwable in case a throwable is thrown.
      */
     @Test
     public void testAddRosterItem() throws Throwable {
@@ -203,6 +207,8 @@ public class RosterTest extends InitSmackIm {
      * Test updating a roster item according to the example in
      * <a href="http://xmpp.org/rfcs/rfc3921.html#roster-update"
      *     >RFC3921: Updating a Roster Item</a>.
+     *
+     * @throws Throwable in case a throwable is thrown.
      */
     @Test
     public void testUpdateRosterItem() throws Throwable {
@@ -279,6 +285,7 @@ public class RosterTest extends InitSmackIm {
      * Test deleting a roster item according to the example in
      * <a href="http://xmpp.org/rfcs/rfc3921.html#roster-delete"
      *     >RFC3921: Deleting a Roster Item</a>.
+     * @throws Throwable if throwable is thrown.
      */
     @Test
     public void testDeleteRosterItem() throws Throwable {
@@ -327,6 +334,7 @@ public class RosterTest extends InitSmackIm {
      * Test a simple roster push according to the example in
      * <a href="http://xmpp.org/internet-drafts/draft-ietf-xmpp-3921bis-03.html#roster-syntax-actions-push"
      *     >RFC3921bis-03: Roster Push</a>.
+     * @throws Throwable in case a throwable is thrown.
      */
     @Test
     public void testSimpleRosterPush() throws Throwable {
@@ -398,6 +406,7 @@ public class RosterTest extends InitSmackIm {
      * Test if adding an user with an empty group is equivalent with providing
      * no group.
      *
+     * @throws Throwable in case a throwable is thrown.
      * @see <a href="http://www.igniterealtime.org/issues/browse/SMACK-294">SMACK-294</a>
      */
     @Test(timeout = 5000)
@@ -466,6 +475,7 @@ public class RosterTest extends InitSmackIm {
      * Test processing a roster push with an empty group is equivalent with providing
      * no group.
      *
+     * @throws Throwable in case a throwable is thrown.
      * @see <a href="http://www.igniterealtime.org/issues/browse/SMACK-294">SMACK-294</a>
      */
     @Test

smack-im/src/test/java/org/jivesoftware/smack/roster/RosterVersioningTest.java

@@ -97,6 +97,8 @@ public class RosterVersioningTest {
      * by all entries of the roster store.
      * @throws SmackException if Smack detected an exceptional situation.
      * @throws XMPPException if an XMPP protocol error was received.
+     * @throws InterruptedException if interrupted.
+     * @throws IOException if IO exception.
      */
     @Test(timeout = 300000)
     public void testEqualVersionStored() throws InterruptedException, IOException, XMPPException, SmackException {
@@ -172,6 +174,7 @@ public class RosterVersioningTest {
 
     /**
      * Test roster versioning with roster pushes.
+     * @throws Throwable in case a throwable is thrown.
      */
     @SuppressWarnings("UndefinedEquals")
     @Test(timeout = 5000)

smack-im/src/test/java/org/jivesoftware/smack/roster/rosterstore/DirectoryRosterStoreTest.java

@@ -57,6 +57,7 @@ public class DirectoryRosterStoreTest {
 
     /**
      * Tests that opening an uninitialized directory fails.
+     * @throws IOException if IO exception.
      */
     @Test
     public void testStoreUninitialized() throws IOException {
@@ -66,6 +67,7 @@ public class DirectoryRosterStoreTest {
 
     /**
      * Tests that an initialized directory is empty.
+     * @throws IOException if IO exception.
      */
     @Test
     public void testStoreInitializedEmpty() throws IOException {
@@ -80,6 +82,7 @@ public class DirectoryRosterStoreTest {
 
     /**
      * Tests adding and removing entries.
+     * @throws IOException if IO exception.
      */
     @Test
     public void testStoreAddRemove() throws IOException {

smack-integration-test/src/main/java/org/igniterealtime/smack/inttest/AbstractSmackIntTest.java

@@ -84,9 +84,9 @@ public abstract class AbstractSmackIntTest {
 
     protected HttpURLConnection getHttpUrlConnectionFor(URL url) throws IOException {
         HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
-        if (sinttestConfiguration.tlsContext != null && urlConnection instanceof HttpsURLConnection) {
+        if (sinttestConfiguration.sslContextFactory != null && urlConnection instanceof HttpsURLConnection) {
             HttpsURLConnection httpsUrlConnection = (HttpsURLConnection) urlConnection;
-            httpsUrlConnection.setSSLSocketFactory(sinttestConfiguration.tlsContext.getSocketFactory());
+            httpsUrlConnection.setSSLSocketFactory(sinttestConfiguration.sslContextFactory.createSslContext().getSocketFactory());
         }
         return urlConnection;
     }

smack-integration-test/src/main/java/org/igniterealtime/smack/inttest/AbstractSmackIntegrationTest.java

@@ -20,7 +20,15 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
+import org.jivesoftware.smack.StanzaListener;
 import org.jivesoftware.smack.XMPPConnection;
+import org.jivesoftware.smack.filter.AndFilter;
+import org.jivesoftware.smack.filter.FromMatchesFilter;
+import org.jivesoftware.smack.filter.PresenceTypeFilter;
+import org.jivesoftware.smack.packet.Stanza;
+import org.jivesoftware.smack.util.Async.ThrowingRunnable;
+
+import org.igniterealtime.smack.inttest.util.SimpleResultSyncPoint;
 
 public abstract class AbstractSmackIntegrationTest extends AbstractSmackIntTest {
 
@@ -58,4 +66,48 @@ public abstract class AbstractSmackIntegrationTest extends AbstractSmackIntTest
         connectionsLocal.add(conThree);
         this.connections = Collections.unmodifiableList(connectionsLocal);
     }
+
+    /**
+     * Perform action and wait until conA observes a presence form conB.
+     * <p>
+     * This method is usually used so that 'action' performs an operation that changes one entities
+     * features/nodes/capabilities, and we want to check that another connection is able to observe this change, and use
+     * that new "thing" that was added to the connection.
+     * </p>
+     * <p>
+     * Note that this method is a workaround at best and not reliable. Because it is not guaranteed that any XEP-0030
+     * related manager, e.g. EntityCapsManager, already processed the presence when this method returns.
+     * </p>
+     * TODO: Come up with a better solution.
+     *
+     * @param conA the connection to observe the presence on.
+     * @param conB the connection sending the presence
+     * @param action the action to perform.
+     * @throws Exception in case of an exception.
+     */
+    protected void performActionAndWaitForPresence(XMPPConnection conA, XMPPConnection conB, ThrowingRunnable action)
+                    throws Exception {
+        final SimpleResultSyncPoint presenceReceivedSyncPoint = new SimpleResultSyncPoint();
+        final StanzaListener presenceListener = new StanzaListener() {
+            @Override
+            public void processStanza(Stanza packet) {
+                presenceReceivedSyncPoint.signal();
+            }
+        };
+
+        // Add a stanzaListener to listen for incoming presence
+        conA.addAsyncStanzaListener(presenceListener, new AndFilter(
+                        PresenceTypeFilter.AVAILABLE,
+                        FromMatchesFilter.create(conB.getUser())
+                        ));
+
+        action.runOrThrow();
+
+        try {
+            // wait for the dummy feature to get sent via presence
+            presenceReceivedSyncPoint.waitForResult(timeout);
+        } finally {
+            conA.removeAsyncStanzaListener(presenceListener);
+        }
+    }
 }

smack-integration-test/src/main/java/org/igniterealtime/smack/inttest/Configuration.java

@@ -36,6 +36,7 @@ import org.jivesoftware.smack.debugger.ConsoleDebugger;
 import org.jivesoftware.smack.util.Function;
 import org.jivesoftware.smack.util.Objects;
 import org.jivesoftware.smack.util.ParserUtils;
+import org.jivesoftware.smack.util.SslContextFactory;
 import org.jivesoftware.smack.util.StringUtils;
 
 import org.jivesoftware.smackx.debugger.EnhancedDebugger;
@@ -72,7 +73,7 @@ public final class Configuration {
 
     public final String serviceTlsPin;
 
-    public final SSLContext tlsContext;
+    public final SslContextFactory sslContextFactory;
 
     public final SecurityMode securityMode;
 
@@ -121,9 +122,10 @@ public final class Configuration {
                         "'service' must be set. Either via 'properties' files or via system property 'sinttest.service'.");
         serviceTlsPin = builder.serviceTlsPin;
         if (serviceTlsPin != null) {
-            tlsContext = Java7Pinning.forPin(serviceTlsPin);
+            SSLContext sslContext = Java7Pinning.forPin(serviceTlsPin);
+            sslContextFactory = () -> sslContext;
         } else {
-            tlsContext = null;
+            sslContextFactory = null;
         }
         securityMode = builder.securityMode;
         if (builder.replyTimeout > 0) {
@@ -168,8 +170,8 @@ public final class Configuration {
         this.testPackages = builder.testPackages;
 
         this.configurationApplier = b -> {
-            if (tlsContext != null) {
-                b.setCustomSSLContext(tlsContext);
+            if (sslContextFactory != null) {
+                b.setSslContextFactory(sslContextFactory);
             }
             b.setSecurityMode(securityMode);
             b.setXmppDomain(service);

smack-integration-test/src/main/java/org/jivesoftware/smackx/caps/EntityCapsTest.java

@@ -31,6 +31,7 @@ import org.jivesoftware.smack.SmackException.NoResponseException;
 import org.jivesoftware.smack.SmackException.NotConnectedException;
 import org.jivesoftware.smack.SmackException.NotLoggedInException;
 import org.jivesoftware.smack.StanzaListener;
+import org.jivesoftware.smack.XMPPConnection;
 import org.jivesoftware.smack.XMPPException;
 import org.jivesoftware.smack.XMPPException.XMPPErrorException;
 import org.jivesoftware.smack.filter.AndFilter;
@@ -40,6 +41,7 @@ import org.jivesoftware.smack.filter.PresenceTypeFilter;
 import org.jivesoftware.smack.filter.StanzaTypeFilter;
 import org.jivesoftware.smack.packet.Stanza;
 import org.jivesoftware.smack.roster.RosterUtil;
+import org.jivesoftware.smack.util.Async.ThrowingRunnable;
 
 import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
 import org.jivesoftware.smackx.disco.packet.DiscoverInfo;
@@ -49,7 +51,6 @@ import org.igniterealtime.smack.inttest.SmackIntegrationTestEnvironment;
 import org.igniterealtime.smack.inttest.annotations.AfterClass;
 import org.igniterealtime.smack.inttest.annotations.BeforeClass;
 import org.igniterealtime.smack.inttest.annotations.SmackIntegrationTest;
-import org.igniterealtime.smack.inttest.util.SimpleResultSyncPoint;
 
 public class EntityCapsTest extends AbstractSmackIntegrationTest {
 
@@ -124,11 +125,7 @@ public class EntityCapsTest extends AbstractSmackIntegrationTest {
     /**
      * Test if entity caps actually prevent a disco info request and reply.
      *
-     * @throws XMPPException if an XMPP protocol error was received.
-     * @throws InterruptedException if the calling thread was interrupted.
-     * @throws NotConnectedException if the XMPP connection is not connected.
-     * @throws NoResponseException if there was no response from the remote entity.
-     *
+     * @throws Exception if exception.
      */
     @SmackIntegrationTest
     public void testPreventDiscoInfo() throws Exception {
@@ -143,26 +140,7 @@ public class EntityCapsTest extends AbstractSmackIntegrationTest {
 
         }, new AndFilter(new StanzaTypeFilter(DiscoverInfo.class), IQTypeFilter.GET));
 
-        final SimpleResultSyncPoint presenceReceivedSyncPoint = new SimpleResultSyncPoint();
-        final StanzaListener presenceListener = new StanzaListener() {
-            @Override
-            public void processStanza(Stanza packet) {
-                presenceReceivedSyncPoint.signal();
-            }
-        };
-
-        // Add a stanzaListener to listen for incoming presence
-        conOne.addAsyncStanzaListener(presenceListener, PresenceTypeFilter.AVAILABLE);
-
-        // add a bogus feature so that con1 ver won't match con0's
-        sdmTwo.addFeature(dummyFeature);
-
-        try {
-            // wait for the dummy feature to get sent via presence
-            presenceReceivedSyncPoint.waitForResult(timeout);
-        } finally {
-            conOne.removeAsyncStanzaListener(presenceListener);
-        }
+        addFeatureAndWaitForPresence(conOne, conTwo, dummyFeature);
 
         dropCapsCache();
         // discover that
@@ -181,10 +159,10 @@ public class EntityCapsTest extends AbstractSmackIntegrationTest {
     }
 
     @SmackIntegrationTest
-    public void testCapsChanged() {
+    public void testCapsChanged() throws Exception {
         final String dummyFeature = getNewDummyFeature();
         String nodeVerBefore = EntityCapsManager.getNodeVersionByJid(conTwo.getUser());
-        sdmTwo.addFeature(dummyFeature);
+        addFeatureAndWaitForPresence(conOne, conTwo, dummyFeature);
         String nodeVerAfter = EntityCapsManager.getNodeVersionByJid(conTwo.getUser());
 
         assertFalse(nodeVerBefore.equals(nodeVerAfter));
@@ -229,4 +207,24 @@ public class EntityCapsTest extends AbstractSmackIntegrationTest {
     private static void dropCapsCache() {
         EntityCapsManager.CAPS_CACHE.clear();
     }
+
+    /**
+     * Adds 'feature' to conB and waits until conA observes a presence form conB.
+     *
+     * @param conA the connection to observe the presence on.
+     * @param conB the connection to add the feature to.
+     * @param feature the feature to add.
+     * @throws Exception in case of an exception.
+     */
+    private void addFeatureAndWaitForPresence(XMPPConnection conA, XMPPConnection conB, String feature)
+                    throws Exception {
+        final ServiceDiscoveryManager sdmB = ServiceDiscoveryManager.getInstanceFor(conB);
+        ThrowingRunnable action = new ThrowingRunnable() {
+            @Override
+            public void runOrThrow() throws Exception {
+                sdmB.addFeature(feature);
+            }
+        };
+        performActionAndWaitForPresence(conA, conB, action);
+    }
 }

smack-integration-test/src/main/java/org/jivesoftware/smackx/chatstate/ChatStateIntegrationTest.java

@@ -21,7 +21,6 @@ import org.jivesoftware.smack.chat2.ChatManager;
 import org.jivesoftware.smack.packet.Message;
 
 import org.jivesoftware.smackx.chatstates.ChatState;
-import org.jivesoftware.smackx.chatstates.ChatStateListener;
 import org.jivesoftware.smackx.chatstates.ChatStateManager;
 
 import org.igniterealtime.smack.inttest.AbstractSmackIntegrationTest;
@@ -34,25 +33,19 @@ public class ChatStateIntegrationTest extends AbstractSmackIntegrationTest {
 
     // Listener for composing chat state
     private final SimpleResultSyncPoint composingSyncPoint = new SimpleResultSyncPoint();
-    private final ChatStateListener composingListener = new ChatStateListener() {
-        @Override
-        public void stateChanged(Chat chat, ChatState state, Message message) {
-            if (state.equals(ChatState.composing)) {
-                composingSyncPoint.signal();
-            }
+    private void  composingListener(Chat chat, ChatState state, Message message) {
+        if (state.equals(ChatState.composing)) {
+            composingSyncPoint.signal();
         }
-    };
+    }
 
     // Listener for active chat state
     private final SimpleResultSyncPoint activeSyncPoint = new SimpleResultSyncPoint();
-    private final ChatStateListener activeListener = new ChatStateListener() {
-        @Override
-        public void stateChanged(Chat chat, ChatState state, Message message) {
-            if (state.equals(ChatState.active)) {
-                activeSyncPoint.signal();
-            }
+    private void activeListener(Chat chat, ChatState state, Message message) {
+        if (state.equals(ChatState.active)) {
+            activeSyncPoint.signal();
         }
-    };
+    }
 
 
     public ChatStateIntegrationTest(SmackIntegrationTestEnvironment environment) {
@@ -65,8 +58,8 @@ public class ChatStateIntegrationTest extends AbstractSmackIntegrationTest {
         ChatStateManager manTwo = ChatStateManager.getInstance(conTwo);
 
         // Add chatState listeners.
-        manTwo.addChatStateListener(composingListener);
-        manTwo.addChatStateListener(activeListener);
+        manTwo.addChatStateListener(this::composingListener);
+        manTwo.addChatStateListener(this::activeListener);
 
         Chat chatOne = ChatManager.getInstanceFor(conOne)
                 .chatWith(conTwo.getUser().asEntityBareJid());
@@ -86,7 +79,7 @@ public class ChatStateIntegrationTest extends AbstractSmackIntegrationTest {
     @AfterClass
     public void cleanup() {
         ChatStateManager manTwo = ChatStateManager.getInstance(conTwo);
-        manTwo.removeChatStateListener(composingListener);
-        manTwo.removeChatStateListener(activeListener);
+        manTwo.removeChatStateListener(this::composingListener);
+        manTwo.removeChatStateListener(this::activeListener);
     }
 }

smack-integration-test/src/main/java/org/jivesoftware/smackx/httpfileupload/HttpFileUploadIntegrationTest.java

@@ -57,7 +57,9 @@ public class HttpFileUploadIntegrationTest extends AbstractSmackIntegrationTest
                             + " does not accept files of size " + FILE_SIZE
                             + ". It only accepts files with  a maximum size of " + uploadService.getMaxFileSize());
         }
-        hfumOne.setTlsContext(environment.configuration.tlsContext);
+        if (environment.configuration.sslContextFactory != null) {
+            hfumOne.setTlsContext(environment.configuration.sslContextFactory.createSslContext());
+        }
     }
 
     @SmackIntegrationTest

smack-integration-test/src/main/java/org/jivesoftware/smackx/softwareInfo/SoftwareInfoIntegrationTest.java

@@ -16,13 +16,14 @@
  */
 package org.jivesoftware.smackx.softwareInfo;
 
-import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import java.io.IOException;
 import java.net.URI;
 import java.net.URISyntaxException;
 
 import org.jivesoftware.smack.parsing.SmackParsingException;
+import org.jivesoftware.smack.util.Async.ThrowingRunnable;
 import org.jivesoftware.smack.xml.XmlPullParserException;
 import org.jivesoftware.smackx.mediaelement.element.MediaElement;
 import org.jivesoftware.smackx.softwareinfo.SoftwareInfoManager;
@@ -54,9 +55,14 @@ public class SoftwareInfoIntegrationTest extends AbstractSmackIntegrationTest {
     @SmackIntegrationTest
     public void test() throws Exception {
         SoftwareInfoForm softwareInfoSent = createSoftwareInfoForm();
-        sim1.publishSoftwareInformationForm(softwareInfoSent);
+        performActionAndWaitForPresence(conTwo, conOne, new ThrowingRunnable() {
+            @Override
+            public void runOrThrow() throws Exception {
+                sim1.publishSoftwareInformationForm(softwareInfoSent);
+            }
+        });
         SoftwareInfoForm softwareInfoFormReceived = sim2.fromJid(conOne.getUser());
-        assertTrue(softwareInfoFormReceived.equals(softwareInfoSent));
+        assertEquals(softwareInfoSent, softwareInfoFormReceived);
     }
 
     private static SoftwareInfoForm createSoftwareInfoForm() throws URISyntaxException {

smack-omemo-signal/src/test/java/org/jivesoftware/smackx/omemo/SignalOmemoStoreTest.java

@@ -60,7 +60,7 @@ public class SignalOmemoStoreTest extends OmemoStoreTest<IdentityKeyPair, Identi
 
     /**
      * We are running this Test with multiple available OmemoStore implementations.
-     * @return
+     * @return the test parameters.
      * @throws IOException if an I/O error occurred.
      */
     @Parameterized.Parameters

smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/OmemoManager.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2017 Paul Schaub
+ * Copyright 2017 Paul Schaub, 2020 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,7 +17,6 @@
 package org.jivesoftware.smackx.omemo;
 
 import static org.jivesoftware.smackx.omemo.util.OmemoConstants.OMEMO_NAMESPACE_V_AXOLOTL;
-import static org.jivesoftware.smackx.omemo.util.OmemoConstants.PEP_NODE_DEVICE_LIST_NOTIFY;
 
 import java.io.IOException;
 import java.security.NoSuchAlgorithmException;
@@ -37,17 +36,13 @@ import java.util.logging.Logger;
 import org.jivesoftware.smack.ConnectionListener;
 import org.jivesoftware.smack.Manager;
 import org.jivesoftware.smack.SmackException;
-import org.jivesoftware.smack.StanzaListener;
 import org.jivesoftware.smack.XMPPConnection;
 import org.jivesoftware.smack.XMPPException;
-import org.jivesoftware.smack.filter.StanzaFilter;
-import org.jivesoftware.smack.packet.ExtensionElement;
 import org.jivesoftware.smack.packet.Message;
 import org.jivesoftware.smack.packet.MessageBuilder;
 import org.jivesoftware.smack.packet.Stanza;
 import org.jivesoftware.smack.util.Async;
 
-import org.jivesoftware.smackx.carbons.CarbonCopyReceivedListener;
 import org.jivesoftware.smackx.carbons.CarbonManager;
 import org.jivesoftware.smackx.carbons.packet.CarbonExtension;
 import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
@@ -74,11 +69,9 @@ import org.jivesoftware.smackx.omemo.trust.OmemoFingerprint;
 import org.jivesoftware.smackx.omemo.trust.OmemoTrustCallback;
 import org.jivesoftware.smackx.omemo.trust.TrustState;
 import org.jivesoftware.smackx.omemo.util.MessageOrOmemoMessage;
-import org.jivesoftware.smackx.pep.PepListener;
+import org.jivesoftware.smackx.omemo.util.OmemoConstants;
+import org.jivesoftware.smackx.pep.PepEventListener;
 import org.jivesoftware.smackx.pep.PepManager;
-import org.jivesoftware.smackx.pubsub.EventElement;
-import org.jivesoftware.smackx.pubsub.ItemsExtension;
-import org.jivesoftware.smackx.pubsub.PayloadItem;
 import org.jivesoftware.smackx.pubsub.PubSubException;
 import org.jivesoftware.smackx.pubsub.packet.PubSub;
 
@@ -105,6 +98,8 @@ public final class OmemoManager extends Manager {
     private final HashSet<OmemoMessageListener> omemoMessageListeners = new HashSet<>();
     private final HashSet<OmemoMucMessageListener> omemoMucMessageListeners = new HashSet<>();
 
+    private final PepManager pepManager;
+
     private OmemoTrustCallback trustCallback;
 
     private BareJid ownJid;
@@ -120,6 +115,7 @@ public final class OmemoManager extends Manager {
         super(connection);
 
         service = OmemoService.getInstance();
+        pepManager = PepManager.getInstanceFor(connection);
 
         this.deviceId = deviceId;
 
@@ -138,9 +134,6 @@ public final class OmemoManager extends Manager {
 
         // StanzaListeners
         resumeStanzaAndPEPListeners();
-
-        // Announce OMEMO support
-        ServiceDiscoveryManager.getInstanceFor(connection).addFeature(PEP_NODE_DEVICE_LIST_NOTIFY);
     }
 
     /**
@@ -251,7 +244,6 @@ public final class OmemoManager extends Manager {
         }
 
         getOmemoService().init(new LoggedInOmemoManager(this));
-        ServiceDiscoveryManager.getInstanceFor(connection()).addFeature(PEP_NODE_DEVICE_LIST_NOTIFY);
     }
 
     /**
@@ -893,27 +885,25 @@ public final class OmemoManager extends Manager {
      * after {@link #stopStanzaAndPEPListeners()} was called.
      */
     public void resumeStanzaAndPEPListeners() {
-        PepManager pepManager = PepManager.getInstanceFor(connection());
         CarbonManager carbonManager = CarbonManager.getInstanceFor(connection());
 
         // Remove listeners to avoid them getting added twice
-        connection().removeAsyncStanzaListener(internalOmemoMessageStanzaListener);
-        carbonManager.removeCarbonCopyReceivedListener(internalOmemoCarbonCopyListener);
-        pepManager.removePepListener(deviceListUpdateListener);
+        connection().removeAsyncStanzaListener(this::internalOmemoMessageStanzaListener);
+        carbonManager.removeCarbonCopyReceivedListener(this::internalOmemoCarbonCopyListener);
 
         // Add listeners
-        pepManager.addPepListener(deviceListUpdateListener);
-        connection().addAsyncStanzaListener(internalOmemoMessageStanzaListener, omemoMessageStanzaFilter);
-        carbonManager.addCarbonCopyReceivedListener(internalOmemoCarbonCopyListener);
+        pepManager.addPepEventListener(OmemoConstants.PEP_NODE_DEVICE_LIST, OmemoDeviceListElement.class, pepOmemoDeviceListEventListener);
+        connection().addAsyncStanzaListener(this::internalOmemoMessageStanzaListener, OmemoManager::isOmemoMessage);
+        carbonManager.addCarbonCopyReceivedListener(this::internalOmemoCarbonCopyListener);
     }
 
     /**
      * Remove active stanza listeners needed for OMEMO.
      */
     public void stopStanzaAndPEPListeners() {
-        PepManager.getInstanceFor(connection()).removePepListener(deviceListUpdateListener);
-        connection().removeAsyncStanzaListener(internalOmemoMessageStanzaListener);
-        CarbonManager.getInstanceFor(connection()).removeCarbonCopyReceivedListener(internalOmemoCarbonCopyListener);
+        pepManager.removePepEventListener(pepOmemoDeviceListEventListener);
+        connection().removeAsyncStanzaListener(this::internalOmemoMessageStanzaListener);
+        CarbonManager.getInstanceFor(connection()).removeCarbonCopyReceivedListener(this::internalOmemoCarbonCopyListener);
     }
 
     /**
@@ -961,127 +951,87 @@ public final class OmemoManager extends Manager {
     /**
      * StanzaListener that listens for incoming Stanzas which contain OMEMO elements.
      */
-    private final StanzaListener internalOmemoMessageStanzaListener = new StanzaListener() {
+    private void internalOmemoMessageStanzaListener(final Stanza packet) {
+        Async.go(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    getOmemoService().onOmemoMessageStanzaReceived(packet,
+                            new LoggedInOmemoManager(OmemoManager.this));
+                } catch (SmackException.NotLoggedInException | IOException e) {
+                    LOGGER.log(Level.SEVERE, "Exception while processing OMEMO stanza", e);
+                }
+            }
+        });
+    }
 
-        @Override
-        public void processStanza(final Stanza packet) {
-            Async.go(new Runnable() {
-                @Override
-                public void run() {
+    /**
+     * CarbonCopyListener that listens for incoming carbon copies which contain OMEMO elements.
+     */
+    private void internalOmemoCarbonCopyListener(final CarbonExtension.Direction direction,
+                    final Message carbonCopy,
+                    final Message wrappingMessage) {
+        Async.go(new Runnable() {
+            @Override
+            public void run() {
+                if (isOmemoMessage(carbonCopy)) {
                     try {
-                        getOmemoService().onOmemoMessageStanzaReceived(packet,
+                        getOmemoService().onOmemoCarbonCopyReceived(direction, carbonCopy, wrappingMessage,
                                 new LoggedInOmemoManager(OmemoManager.this));
                     } catch (SmackException.NotLoggedInException | IOException e) {
                         LOGGER.log(Level.SEVERE, "Exception while processing OMEMO stanza", e);
                     }
                 }
-            });
-        }
-    };
+            }
+        });
+    }
 
-    /**
-     * CarbonCopyListener that listens for incoming carbon copies which contain OMEMO elements.
-     */
-    private final CarbonCopyReceivedListener internalOmemoCarbonCopyListener = new CarbonCopyReceivedListener() {
-        @Override
-        public void onCarbonCopyReceived(final CarbonExtension.Direction direction,
-                                         final Message carbonCopy,
-                                         final Message wrappingMessage) {
-            Async.go(new Runnable() {
-                @Override
-                public void run() {
-                    if (omemoMessageStanzaFilter.accept(carbonCopy)) {
-                        try {
-                            getOmemoService().onOmemoCarbonCopyReceived(direction, carbonCopy, wrappingMessage,
-                                    new LoggedInOmemoManager(OmemoManager.this));
-                        } catch (SmackException.NotLoggedInException | IOException e) {
-                            LOGGER.log(Level.SEVERE, "Exception while processing OMEMO stanza", e);
-                        }
-                    }
-                }
-            });
-        }
-    };
+    @SuppressWarnings("UnnecessaryLambda")
+    private final PepEventListener<OmemoDeviceListElement> pepOmemoDeviceListEventListener =
+                    (from, receivedDeviceList, id, message) -> {
+        // Device List <list>
+        OmemoCachedDeviceList deviceList;
+        try {
+            getOmemoService().getOmemoStoreBackend().mergeCachedDeviceList(getOwnDevice(), from,
+                            receivedDeviceList);
 
-    /**
-     * PEPListener that listens for OMEMO deviceList updates.
-     */
-    private final PepListener deviceListUpdateListener = new PepListener() {
-        @Override
-        public void eventReceived(EntityBareJid from, EventElement event, Message message) {
-
-            // Unknown sender, no more work to do.
-            if (from == null) {
-                // TODO: This DOES happen for some reason. Figure out when...
+            if (!from.asBareJid().equals(getOwnJid())) {
                 return;
             }
 
-            for (ExtensionElement items : event.getExtensions()) {
-                if (!(items instanceof ItemsExtension)) {
-                    continue;
-                }
-
-                for (ExtensionElement item : ((ItemsExtension) items).getExtensions()) {
-                    if (!(item instanceof PayloadItem<?>)) {
-                        continue;
-                    }
-
-                    PayloadItem<?> payloadItem = (PayloadItem<?>) item;
-
-                    if (!(payloadItem.getPayload() instanceof OmemoDeviceListElement)) {
-                        continue;
-                    }
-
-                    // Device List <list>
-                    OmemoCachedDeviceList deviceList;
-                    OmemoDeviceListElement receivedDeviceList = (OmemoDeviceListElement) payloadItem.getPayload();
-                    try {
-                        getOmemoService().getOmemoStoreBackend().mergeCachedDeviceList(getOwnDevice(), from,
-                                receivedDeviceList);
-
-                        if (!from.asBareJid().equals(getOwnJid())) {
-                            continue;
-                        }
-
-                        deviceList = getOmemoService().cleanUpDeviceList(getOwnDevice());
-                    } catch (IOException e) {
-                        LOGGER.log(Level.SEVERE,
-                                "IOException while processing OMEMO PEP device updates. Message: " + message,
+            deviceList = getOmemoService().cleanUpDeviceList(getOwnDevice());
+        } catch (IOException e) {
+            LOGGER.log(Level.SEVERE,
+                            "IOException while processing OMEMO PEP device updates. Message: " + message,
                                 e);
-                        continue;
-                    }
-                    final OmemoDeviceListElement_VAxolotl newDeviceList = new OmemoDeviceListElement_VAxolotl(deviceList);
+            return;
+        }
+        final OmemoDeviceListElement_VAxolotl newDeviceList = new OmemoDeviceListElement_VAxolotl(deviceList);
 
-                    if (!newDeviceList.copyDeviceIds().equals(receivedDeviceList.copyDeviceIds())) {
-                        LOGGER.log(Level.FINE, "Republish deviceList due to changes:" +
-                                " Received: " + Arrays.toString(receivedDeviceList.copyDeviceIds().toArray()) +
-                                " Published: " + Arrays.toString(newDeviceList.copyDeviceIds().toArray()));
-                        Async.go(new Runnable() {
-                            @Override
-                            public void run() {
-                                try {
-                                    OmemoService.publishDeviceList(connection(), newDeviceList);
-                                } catch (InterruptedException | XMPPException.XMPPErrorException |
-                                        SmackException.NotConnectedException | SmackException.NoResponseException | PubSubException.NotALeafNodeException e) {
-                                    LOGGER.log(Level.WARNING, "Could not publish our deviceList upon an received update.", e);
-                                }
-                            }
-                        });
+        if (!newDeviceList.copyDeviceIds().equals(receivedDeviceList.copyDeviceIds())) {
+            LOGGER.log(Level.FINE, "Republish deviceList due to changes:" +
+                            " Received: " + Arrays.toString(receivedDeviceList.copyDeviceIds().toArray()) +
+                            " Published: " + Arrays.toString(newDeviceList.copyDeviceIds().toArray()));
+            Async.go(new Runnable() {
+                @Override
+                public void run() {
+                    try {
+                        OmemoService.publishDeviceList(connection(), newDeviceList);
+                    } catch (InterruptedException | XMPPException.XMPPErrorException |
+                                    SmackException.NotConnectedException | SmackException.NoResponseException | PubSubException.NotALeafNodeException e) {
+                        LOGGER.log(Level.WARNING, "Could not publish our deviceList upon an received update.", e);
                     }
                 }
-            }
+            });
         }
     };
 
     /**
      * StanzaFilter that filters messages containing a OMEMO element.
      */
-    private final StanzaFilter omemoMessageStanzaFilter = new StanzaFilter() {
-        @Override
-        public boolean accept(Stanza stanza) {
-            return stanza instanceof Message && OmemoManager.stanzaContainsOmemoElement(stanza);
-        }
-    };
+    private static boolean isOmemoMessage(Stanza stanza) {
+        return stanza instanceof Message && OmemoManager.stanzaContainsOmemoElement(stanza);
+    }
 
     /**
      * Guard class which ensures that the wrapped OmemoManager knows its BareJid.

smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/util/OmemoConstants.java

@@ -31,7 +31,6 @@ public final class OmemoConstants {
 
     // PubSub Node names
     public static final String PEP_NODE_DEVICE_LIST = OMEMO_NAMESPACE_V_AXOLOTL + ".devicelist";
-    public static final String PEP_NODE_DEVICE_LIST_NOTIFY = PEP_NODE_DEVICE_LIST + "+notify";
     public static final String PEP_NODE_BUNDLES = OMEMO_NAMESPACE_V_AXOLOTL + ".bundles";
 
     /**

smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/OpenPgpManager.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2017-2019 Florian Schmaus, 2018 Paul Schaub.
+ * Copyright 2017-2020 Florian Schmaus, 2018 Paul Schaub.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -39,7 +39,6 @@ import org.jivesoftware.smack.XMPPConnection;
 import org.jivesoftware.smack.XMPPException;
 import org.jivesoftware.smack.chat2.Chat;
 import org.jivesoftware.smack.chat2.ChatManager;
-import org.jivesoftware.smack.chat2.IncomingChatMessageListener;
 import org.jivesoftware.smack.packet.Message;
 import org.jivesoftware.smack.util.Async;
 import org.jivesoftware.smack.util.stringencoder.Base64;
@@ -69,12 +68,10 @@ import org.jivesoftware.smackx.ox.store.definition.OpenPgpStore;
 import org.jivesoftware.smackx.ox.store.definition.OpenPgpTrustStore;
 import org.jivesoftware.smackx.ox.util.OpenPgpPubSubUtil;
 import org.jivesoftware.smackx.ox.util.SecretKeyBackupHelper;
+import org.jivesoftware.smackx.pep.PepEventListener;
 import org.jivesoftware.smackx.pep.PepListener;
 import org.jivesoftware.smackx.pep.PepManager;
-import org.jivesoftware.smackx.pubsub.EventElement;
-import org.jivesoftware.smackx.pubsub.ItemsExtension;
 import org.jivesoftware.smackx.pubsub.LeafNode;
-import org.jivesoftware.smackx.pubsub.PayloadItem;
 import org.jivesoftware.smackx.pubsub.PubSubException;
 import org.jivesoftware.smackx.pubsub.PubSubFeature;
 
@@ -173,6 +170,9 @@ public final class OpenPgpManager extends Manager {
     private final Set<SignElementReceivedListener> signElementReceivedListeners = new HashSet<>();
     private final Set<CryptElementReceivedListener> cryptElementReceivedListeners = new HashSet<>();
 
+    @SuppressWarnings("UnnecessaryLambda")
+    private final PepEventListener<PublicKeysListElement> pepPublicKeyListElementListener = (from, listElement, id, message) -> processPublicKeysListElement(from, listElement);;
+
     /**
      * Private constructor to avoid instantiation without putting the object into {@code INSTANCES}.
      *
@@ -180,7 +180,7 @@ public final class OpenPgpManager extends Manager {
      */
     private OpenPgpManager(XMPPConnection connection) {
         super(connection);
-        ChatManager.getInstanceFor(connection).addIncomingListener(incomingOpenPgpMessageListener);
+        ChatManager.getInstanceFor(connection).addIncomingListener(this::incomingChatMessageListener);
         pepManager = PepManager.getInstanceFor(connection);
     }
 
@@ -279,7 +279,7 @@ public final class OpenPgpManager extends Manager {
         publishPublicKey(pepManager, pubkeyElement, primaryFingerprint);
 
         // Subscribe to public key changes
-        PepManager.getInstanceFor(connection()).addPepListener(metadataListener);
+        pepManager.addPepEventListener(PEP_NODE_PUBLIC_KEYS, PublicKeysListElement.class, pepPublicKeyListElementListener);
         ServiceDiscoveryManager.getInstanceFor(connection())
                 .addFeature(PEP_NODE_PUBLIC_KEYS_NOTIFY);
     }
@@ -381,7 +381,7 @@ public final class OpenPgpManager extends Manager {
      * Remove the metadata listener. This method is mainly used in tests.
      */
     public void stopMetadataListener() {
-        PepManager.getInstanceFor(connection()).removePepListener(metadataListener);
+        pepManager.removePepEventListener(pepPublicKeyListElementListener);
     }
 
     /**
@@ -497,31 +497,6 @@ public final class OpenPgpManager extends Manager {
     Private stuff.
      */
 
-    /**
-     * {@link PepListener} that listens for changes to the OX public keys metadata node.
-     *
-     * @see <a href="https://xmpp.org/extensions/xep-0373.html#pubsub-notifications">XEP-0373 §4.4</a>
-     */
-    private final PepListener metadataListener = new PepListener() {
-        @Override
-        public void eventReceived(final EntityBareJid from, final EventElement event, final Message message) {
-            if (PEP_NODE_PUBLIC_KEYS.equals(event.getEvent().getNode())) {
-                final BareJid contact = from.asBareJid();
-                LOGGER.log(Level.INFO, "Received OpenPGP metadata update from " + contact);
-                Async.go(new Runnable() {
-                    @Override
-                    public void run() {
-                        ItemsExtension items = (ItemsExtension) event.getExtensions().get(0);
-                        PayloadItem<?> payload = (PayloadItem<?>) items.getItems().get(0);
-                        PublicKeysListElement listElement = (PublicKeysListElement) payload.getPayload();
-
-                        processPublicKeysListElement(from, listElement);
-                    }
-                }, "ProcessOXMetadata");
-            }
-        }
-    };
-
     private void processPublicKeysListElement(BareJid contact, PublicKeysListElement listElement) {
         OpenPgpContact openPgpContact = getOpenPgpContact(contact.asEntityBareJidIfPossible());
         try {
@@ -548,62 +523,60 @@ public final class OpenPgpManager extends Manager {
         return provider.decryptAndOrVerify(element, getOpenPgpSelf(), sender);
     }
 
-    private final IncomingChatMessageListener incomingOpenPgpMessageListener =
-            new IncomingChatMessageListener() {
-                @Override
-                public void newIncomingMessage(final EntityBareJid from, final Message message, Chat chat) {
-                    Async.go(new Runnable() {
-                        @Override
-                        public void run() {
-                            OpenPgpElement element = message.getExtension(OpenPgpElement.class);
-                            if (element == null) {
-                                // Message does not contain an OpenPgpElement -> discard
-                                return;
-                            }
-
-                            OpenPgpContact contact = getOpenPgpContact(from);
-
-                            OpenPgpMessage decrypted = null;
-                            OpenPgpContentElement contentElement = null;
-                            try {
-                                decrypted = decryptOpenPgpElement(element, contact);
-                                contentElement = decrypted.getOpenPgpContentElement();
-                            } catch (PGPException e) {
-                                LOGGER.log(Level.WARNING, "Could not decrypt incoming OpenPGP encrypted message", e);
-                            } catch (XmlPullParserException | IOException e) {
-                                LOGGER.log(Level.WARNING, "Invalid XML content of incoming OpenPGP encrypted message", e);
-                            } catch (SmackException.NotLoggedInException e) {
-                                LOGGER.log(Level.WARNING, "Cannot determine our JID, since we are not logged in.", e);
-                            }
-
-                            if (contentElement instanceof SigncryptElement) {
-                                for (SigncryptElementReceivedListener l : signcryptElementReceivedListeners) {
-                                    l.signcryptElementReceived(contact, message, (SigncryptElement) contentElement, decrypted.getMetadata());
-                                }
-                                return;
-                            }
-
-                            if (contentElement instanceof SignElement) {
-                                for (SignElementReceivedListener l : signElementReceivedListeners) {
-                                    l.signElementReceived(contact, message, (SignElement) contentElement, decrypted.getMetadata());
-                                }
-                                return;
-                            }
-
-                            if (contentElement instanceof CryptElement) {
-                                for (CryptElementReceivedListener l : cryptElementReceivedListeners) {
-                                    l.cryptElementReceived(contact, message, (CryptElement) contentElement, decrypted.getMetadata());
-                                }
-                                return;
-                            }
-
-                            else {
-                                throw new AssertionError("Invalid element received: " + contentElement.getClass().getName());
-                            }
-                        }
-                    });
+    private void incomingChatMessageListener(final EntityBareJid from, final Message message, Chat chat) {
+        Async.go(new Runnable() {
+            @Override
+            public void run() {
+                OpenPgpElement element = message.getExtension(OpenPgpElement.class);
+                if (element == null) {
+                    // Message does not contain an OpenPgpElement -> discard
+                    return;
                 }
-            };
+
+                OpenPgpContact contact = getOpenPgpContact(from);
+
+                OpenPgpMessage decrypted = null;
+                OpenPgpContentElement contentElement = null;
+                try {
+                    decrypted = decryptOpenPgpElement(element, contact);
+                    contentElement = decrypted.getOpenPgpContentElement();
+                } catch (PGPException e) {
+                    LOGGER.log(Level.WARNING, "Could not decrypt incoming OpenPGP encrypted message", e);
+                } catch (XmlPullParserException | IOException e) {
+                    LOGGER.log(Level.WARNING, "Invalid XML content of incoming OpenPGP encrypted message", e);
+                } catch (SmackException.NotLoggedInException e) {
+                    LOGGER.log(Level.WARNING, "Cannot determine our JID, since we are not logged in.", e);
+                }
+
+                if (contentElement instanceof SigncryptElement) {
+                    for (SigncryptElementReceivedListener l : signcryptElementReceivedListeners) {
+                        l.signcryptElementReceived(contact, message, (SigncryptElement) contentElement,
+                                        decrypted.getMetadata());
+                    }
+                    return;
+                }
+
+                if (contentElement instanceof SignElement) {
+                    for (SignElementReceivedListener l : signElementReceivedListeners) {
+                        l.signElementReceived(contact, message, (SignElement) contentElement, decrypted.getMetadata());
+                    }
+                    return;
+                }
+
+                if (contentElement instanceof CryptElement) {
+                    for (CryptElementReceivedListener l : cryptElementReceivedListeners) {
+                        l.cryptElementReceived(contact, message, (CryptElement) contentElement,
+                                        decrypted.getMetadata());
+                    }
+                    return;
+                }
+
+                else {
+                    throw new AssertionError("Invalid element received: " + contentElement.getClass().getName());
+                }
+            }
+        });
+    }
 
     /**
      * Create a {@link PubkeyElement} which contains the OpenPGP public key of {@code owner} which belongs to

smack-openpgp/src/main/java/org/jivesoftware/smackx/ox_im/OXInstantMessagingManager.java

@@ -44,7 +44,6 @@ import org.jivesoftware.smackx.ox.crypto.OpenPgpElementAndMetadata;
 import org.jivesoftware.smackx.ox.element.OpenPgpContentElement;
 import org.jivesoftware.smackx.ox.element.OpenPgpElement;
 import org.jivesoftware.smackx.ox.element.SigncryptElement;
-import org.jivesoftware.smackx.ox.listener.SigncryptElementReceivedListener;
 
 import org.bouncycastle.openpgp.PGPException;
 import org.jxmpp.jid.BareJid;
@@ -127,7 +126,7 @@ public final class OXInstantMessagingManager extends Manager {
     private OXInstantMessagingManager(final XMPPConnection connection) {
         super(connection);
         openPgpManager = OpenPgpManager.getInstanceFor(connection);
-        openPgpManager.registerSigncryptReceivedListener(signcryptElementReceivedListener);
+        openPgpManager.registerSigncryptReceivedListener(this::signcryptElementReceivedListener);
         announceSupportForOxInstantMessaging();
     }
 
@@ -358,12 +357,9 @@ public final class OXInstantMessagingManager extends Manager {
         message.setBody("This message is encrypted using XEP-0374: OpenPGP for XMPP: Instant Messaging.");
     }
 
-    private final SigncryptElementReceivedListener signcryptElementReceivedListener = new SigncryptElementReceivedListener() {
-        @Override
-        public void signcryptElementReceived(OpenPgpContact contact, Message originalMessage, SigncryptElement signcryptElement, OpenPgpMetadata metadata) {
-            for (OxMessageListener listener : oxMessageListeners) {
-                listener.newIncomingOxMessage(contact, originalMessage, signcryptElement, metadata);
-            }
+    private void signcryptElementReceivedListener(OpenPgpContact contact, Message originalMessage, SigncryptElement signcryptElement, OpenPgpMetadata metadata) {
+        for (OxMessageListener listener : oxMessageListeners) {
+            listener.newIncomingOxMessage(contact, originalMessage, signcryptElement, metadata);
         }
-    };
+    }
 }

smack-repl/build.gradle

@@ -2,6 +2,9 @@ plugins {
 	id "com.github.alisiikh.scalastyle_2.12" version "2.0.2"
 }
 
+description = """\
+A REPL (Read-Eval-Print-Loop) for Smack, or, in other words, a CLI (Command Line Interface) for Smack."""
+
 apply plugin: 'scala'
 apply plugin: 'com.github.alisiikh.scalastyle_2.12'
 

smack-repl/src/main/java/org/igniterealtime/smack/smackrepl/Nio.java

@@ -42,6 +42,8 @@ import org.jivesoftware.smack.packet.Message;
 import org.jivesoftware.smack.sm.StreamManagementModuleDescriptor;
 import org.jivesoftware.smack.tcp.XmppTcpTransportModuleDescriptor;
 
+import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
+
 import org.jxmpp.util.XmppDateTime;
 
 public class Nio {
@@ -128,9 +130,10 @@ public class Nio {
         connection.disconnect();
 
         ModularXmppClientToServerConnection.Stats connectionStats = connection.getStats();
+        ServiceDiscoveryManager.Stats serviceDiscoveryManagerStats = ServiceDiscoveryManager.getInstanceFor(connection).getStats();
 
         // CHECKSTYLE:OFF
-        System.out.println("NIO successfully finished, yeah!\n" + connectionStats);
+        System.out.println("NIO successfully finished, yeah!\n" + connectionStats + '\n' + serviceDiscoveryManagerStats);
         // CHECKSTYLE:ON
     }
 

smack-repl/src/main/java/org/igniterealtime/smack/smackrepl/TlsTest.java

@@ -89,7 +89,7 @@ public class TlsTest {
 
         if (StringUtils.isNotEmpty(tlsPin)) {
             SSLContext sslContext = Java7Pinning.forPin(tlsPin);
-            builder.setCustomSSLContext(sslContext);
+            builder.setSslContextFactory(() -> sslContext);
         }
 
 

smack-tcp/src/main/java/org/jivesoftware/smack/tcp/XMPPTCPConnection.java

@@ -81,6 +81,7 @@ import org.jivesoftware.smack.compress.packet.Compressed;
 import org.jivesoftware.smack.compression.XMPPInputOutputStream;
 import org.jivesoftware.smack.datatypes.UInt16;
 import org.jivesoftware.smack.filter.StanzaFilter;
+import org.jivesoftware.smack.internal.SmackTlsContext;
 import org.jivesoftware.smack.packet.Element;
 import org.jivesoftware.smack.packet.IQ;
 import org.jivesoftware.smack.packet.Message;

smack-tcp/src/main/java/org/jivesoftware/smack/tcp/XmppTcpTransportModule.java

@@ -21,13 +21,9 @@ import java.net.InetSocketAddress;
 import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.channels.ClosedChannelException;
+import java.nio.channels.SelectableChannel;
 import java.nio.channels.SelectionKey;
 import java.nio.channels.SocketChannel;
-import java.security.KeyManagementException;
-import java.security.KeyStoreException;
-import java.security.NoSuchAlgorithmException;
-import java.security.NoSuchProviderException;
-import java.security.UnrecoverableKeyException;
 import java.security.cert.CertificateException;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -49,7 +45,6 @@ import javax.net.ssl.SSLEngineResult;
 import javax.net.ssl.SSLException;
 import javax.net.ssl.SSLSession;
 
-import org.jivesoftware.smack.AbstractXMPPConnection.SmackTlsContext;
 import org.jivesoftware.smack.ConnectionConfiguration.SecurityMode;
 import org.jivesoftware.smack.SmackException;
 import org.jivesoftware.smack.SmackException.ConnectionException;
@@ -61,7 +56,6 @@ import org.jivesoftware.smack.SmackException.SecurityRequiredByServerException;
 import org.jivesoftware.smack.SmackException.SmackWrappedException;
 import org.jivesoftware.smack.SmackFuture;
 import org.jivesoftware.smack.SmackFuture.InternalSmackFuture;
-import org.jivesoftware.smack.SmackReactor.ChannelSelectedCallback;
 import org.jivesoftware.smack.SmackReactor.SelectionKeyAttachment;
 import org.jivesoftware.smack.XMPPException.FailedNonzaException;
 import org.jivesoftware.smack.XmppInputOutputFilter;
@@ -75,6 +69,7 @@ import org.jivesoftware.smack.debugger.SmackDebugger;
 import org.jivesoftware.smack.fsm.State;
 import org.jivesoftware.smack.fsm.StateDescriptor;
 import org.jivesoftware.smack.fsm.StateTransitionResult;
+import org.jivesoftware.smack.internal.SmackTlsContext;
 import org.jivesoftware.smack.packet.Stanza;
 import org.jivesoftware.smack.packet.StartTls;
 import org.jivesoftware.smack.packet.StreamOpen;
@@ -280,294 +275,292 @@ public class XmppTcpTransportModule extends ModularXmppClientToServerConnectionM
         }
     };
 
-    private final ChannelSelectedCallback channelSelectedCallback =
-                    (selectedChannel, selectedSelectionKey) -> {
-                assert selectionKey == null || selectionKey == selectedSelectionKey;
-                SocketChannel selectedSocketChannel = (SocketChannel) selectedChannel;
-                // We are *always* interested in OP_READ.
-                int newInterestedOps = SelectionKey.OP_READ;
-                boolean newPendingOutputFilterData = false;
+    private void onChannelSelected(SelectableChannel selectedChannel, SelectionKey selectedSelectionKey) {
+        assert selectionKey == null || selectionKey == selectedSelectionKey;
+        SocketChannel selectedSocketChannel = (SocketChannel) selectedChannel;
+        // We are *always* interested in OP_READ.
+        int newInterestedOps = SelectionKey.OP_READ;
+        boolean newPendingOutputFilterData = false;
 
-                if (!channelSelectedCallbackLock.tryLock()) {
-                    rejectedChannelSelectedCallbacks.incrementAndGet();
+        if (!channelSelectedCallbackLock.tryLock()) {
+            rejectedChannelSelectedCallbacks.incrementAndGet();
+            return;
+        }
+
+        handledChannelSelectedCallbacks++;
+
+        long callbackBytesRead = 0;
+        long callbackBytesWritten = 0;
+
+        try {
+            boolean destinationAddressChanged = false;
+            boolean isLastPartOfElement = false;
+            TopLevelStreamElement currentlyOutgonigTopLevelStreamElement = null;
+            StringBuilder outgoingStreamForDebugger = null;
+
+            writeLoop: while (true) {
+                final boolean moreDataAvailable = !isLastPartOfElement || !connectionInternal.outgoingElementsQueue.isEmpty();
+
+                if (filteredOutgoingBuffer != null || !networkOutgoingBuffers.isEmpty()) {
+                    if (filteredOutgoingBuffer != null) {
+                        networkOutgoingBuffers.add(filteredOutgoingBuffer);
+                        networkOutgoingBuffersBytes += filteredOutgoingBuffer.remaining();
+
+                        filteredOutgoingBuffer = null;
+                        if (moreDataAvailable && networkOutgoingBuffersBytes < 8096) {
+                            continue;
+                        }
+                    }
+
+                    ByteBuffer[] output = networkOutgoingBuffers.toArray(new ByteBuffer[networkOutgoingBuffers.size()]);
+                    long bytesWritten;
+                    try {
+                        bytesWritten = selectedSocketChannel.write(output);
+                    } catch (IOException e) {
+                        // We have seen here so far
+                        // - IOException "Broken pipe"
+                        handleReadWriteIoException(e);
+                        break;
+                    }
+
+                    if (bytesWritten == 0) {
+                        newInterestedOps |= SelectionKey.OP_WRITE;
+                        break;
+                    }
+
+                    callbackBytesWritten += bytesWritten;
+
+                    networkOutgoingBuffersBytes -= bytesWritten;
+
+                    List<? extends Buffer> prunedBuffers = pruneBufferList(networkOutgoingBuffers);
+
+                    for (Buffer prunedBuffer : prunedBuffers) {
+                        List<TopLevelStreamElement> sendElements = bufferToElementMap.remove(prunedBuffer);
+                        if (sendElements == null) {
+                            continue;
+                        }
+                        for (TopLevelStreamElement elementJustSend : sendElements) {
+                            connectionInternal.fireFirstLevelElementSendListeners(elementJustSend);
+                        }
+                    }
+
+                    // Prevent one callback from dominating the reactor thread. Break out of the write-loop if we have
+                    // written a certain amount.
+                    if (callbackBytesWritten > CALLBACK_MAX_BYTES_WRITEN) {
+                        newInterestedOps |= SelectionKey.OP_WRITE;
+                        callbackPreemtBecauseBytesWritten++;
+                        break;
+                    }
+                } else if (outgoingBuffer != null || pendingOutputFilterData) {
+                    pendingOutputFilterData = false;
+
+                    if (outgoingBuffer != null) {
+                        totalBytesWrittenBeforeFilter += outgoingBuffer.remaining();
+                        if (isLastPartOfElement) {
+                            assert currentlyOutgonigTopLevelStreamElement != null;
+                            currentlyOutgoingElements.add(currentlyOutgonigTopLevelStreamElement);
+                        }
+                    }
+
+                    ByteBuffer outputFilterInputData = outgoingBuffer;
+                    // We can now null the outgoingBuffer since the filter step will take care of it from now on.
+                    outgoingBuffer = null;
+
+                    for (ListIterator<XmppInputOutputFilter> it = connectionInternal.getXmppInputOutputFilterBeginIterator(); it.hasNext();) {
+                        XmppInputOutputFilter inputOutputFilter = it.next();
+                        XmppInputOutputFilter.OutputResult outputResult;
+                        try {
+                            outputResult = inputOutputFilter.output(outputFilterInputData, isLastPartOfElement,
+                                    destinationAddressChanged, moreDataAvailable);
+                        } catch (IOException e) {
+                            connectionInternal.notifyConnectionError(e);
+                            break writeLoop;
+                        }
+                        newPendingOutputFilterData |= outputResult.pendingFilterData;
+                        outputFilterInputData = outputResult.filteredOutputData;
+                        if (outputFilterInputData != null) {
+                            outputFilterInputData.flip();
+                        }
+                    }
+
+                    // It is ok if outpuFilterInputData is 'null' here, this is expected behavior.
+                    if (outputFilterInputData != null && outputFilterInputData.hasRemaining()) {
+                        filteredOutgoingBuffer = outputFilterInputData;
+                    } else {
+                        filteredOutgoingBuffer = null;
+                    }
+
+                    // If the filters did eventually not produce any output data but if there is
+                    // pending output data then we have a pending write request after read.
+                    if (filteredOutgoingBuffer == null && newPendingOutputFilterData) {
+                        pendingWriteInterestAfterRead = true;
+                    }
+
+                    if (filteredOutgoingBuffer != null && isLastPartOfElement) {
+                        bufferToElementMap.put(filteredOutgoingBuffer, new ArrayList<>(currentlyOutgoingElements));
+                        currentlyOutgoingElements.clear();
+                    }
+
+                    // Reset that the destination address has changed.
+                    if (destinationAddressChanged) {
+                        destinationAddressChanged = false;
+                    }
+                } else if (outgoingCharSequenceIterator != null) {
+                    CharSequence nextCharSequence = outgoingCharSequenceIterator.next();
+                    outgoingBuffer = UTF8.encode(nextCharSequence);
+                    if (!outgoingCharSequenceIterator.hasNext()) {
+                        outgoingCharSequenceIterator = null;
+                        isLastPartOfElement = true;
+                    } else {
+                        isLastPartOfElement = false;
+                    }
+
+                    final SmackDebugger debugger = connectionInternal.smackDebugger;
+                    if (debugger != null) {
+                        if (outgoingStreamForDebugger == null) {
+                            outgoingStreamForDebugger = new StringBuilder();
+                        }
+                        outgoingStreamForDebugger.append(nextCharSequence);
+
+                        if (isLastPartOfElement) {
+                            try {
+                                outputDebugSplitter.append(outgoingStreamForDebugger);
+                            } catch (IOException e) {
+                                throw new AssertionError(e);
+                            }
+                            debugger.onOutgoingElementCompleted();
+                            outgoingStreamForDebugger = null;
+                        }
+                    }
+                } else if (!connectionInternal.outgoingElementsQueue.isEmpty()) {
+                    currentlyOutgonigTopLevelStreamElement = connectionInternal.outgoingElementsQueue.poll();
+                    if (currentlyOutgonigTopLevelStreamElement instanceof Stanza) {
+                        Stanza currentlyOutgoingStanza = (Stanza) currentlyOutgonigTopLevelStreamElement;
+                        Jid currentDestinationAddress = currentlyOutgoingStanza.getTo();
+                        destinationAddressChanged = !JidUtil.equals(lastDestinationAddress, currentDestinationAddress);
+                        lastDestinationAddress = currentDestinationAddress;
+                    }
+                    CharSequence nextCharSequence = currentlyOutgonigTopLevelStreamElement.toXML(StreamOpen.CLIENT_NAMESPACE);
+                    if (nextCharSequence instanceof XmlStringBuilder) {
+                        XmlStringBuilder xmlStringBuilder = (XmlStringBuilder) nextCharSequence;
+                        XmlEnvironment outgoingStreamXmlEnvironment = connectionInternal.getOutgoingStreamXmlEnvironment();
+                        outgoingCharSequenceIterator = xmlStringBuilder.toList(outgoingStreamXmlEnvironment).iterator();
+                    } else {
+                        outgoingCharSequenceIterator = Collections.singletonList(nextCharSequence).iterator();
+                    }
+                    assert outgoingCharSequenceIterator != null;
+                } else {
+                    // There is nothing more to write.
+                    break;
+                }
+            }
+
+            pendingOutputFilterData = newPendingOutputFilterData;
+            if (!pendingWriteInterestAfterRead && pendingOutputFilterData) {
+                newInterestedOps |= SelectionKey.OP_WRITE;
+            }
+
+            readLoop: while (true) {
+                // Prevent one callback from dominating the reactor thread. Break out of the read-loop if we have
+                // read a certain amount.
+                if (callbackBytesRead > CALLBACK_MAX_BYTES_READ) {
+                    callbackPreemtBecauseBytesRead++;
+                    break;
+                }
+
+                int bytesRead;
+                incomingBuffer.clear();
+                try {
+                    bytesRead = selectedSocketChannel.read(incomingBuffer);
+                } catch (IOException e) {
+                    handleReadWriteIoException(e);
                     return;
                 }
 
-                handledChannelSelectedCallbacks++;
-
-                long callbackBytesRead = 0;
-                long callbackBytesWritten = 0;
-
-                try {
-                    boolean destinationAddressChanged = false;
-                    boolean isLastPartOfElement = false;
-                    TopLevelStreamElement currentlyOutgonigTopLevelStreamElement = null;
-                    StringBuilder outgoingStreamForDebugger = null;
-
-                    writeLoop: while (true) {
-                        final boolean moreDataAvailable = !isLastPartOfElement || !connectionInternal.outgoingElementsQueue.isEmpty();
-
-                        if (filteredOutgoingBuffer != null || !networkOutgoingBuffers.isEmpty()) {
-                            if (filteredOutgoingBuffer != null) {
-                                networkOutgoingBuffers.add(filteredOutgoingBuffer);
-                                networkOutgoingBuffersBytes += filteredOutgoingBuffer.remaining();
-
-                                filteredOutgoingBuffer = null;
-                                if (moreDataAvailable && networkOutgoingBuffersBytes < 8096) {
-                                    continue;
-                                }
-                            }
-
-                            ByteBuffer[] output = networkOutgoingBuffers.toArray(new ByteBuffer[networkOutgoingBuffers.size()]);
-                            long bytesWritten;
-                            try {
-                                bytesWritten = selectedSocketChannel.write(output);
-                            } catch (IOException e) {
-                                // We have seen here so far
-                                // - IOException "Broken pipe"
-                                handleReadWriteIoException(e);
-                                break;
-                            }
-
-                            if (bytesWritten == 0) {
-                                newInterestedOps |= SelectionKey.OP_WRITE;
-                                break;
-                            }
-
-                            callbackBytesWritten += bytesWritten;
-
-                            networkOutgoingBuffersBytes -= bytesWritten;
-
-                            List<? extends Buffer> prunedBuffers = pruneBufferList(networkOutgoingBuffers);
-
-                            for (Buffer prunedBuffer : prunedBuffers) {
-                                List<TopLevelStreamElement> sendElements = bufferToElementMap.remove(prunedBuffer);
-                                if (sendElements == null) {
-                                    continue;
-                                }
-                                for (TopLevelStreamElement elementJustSend : sendElements) {
-                                    connectionInternal.fireFirstLevelElementSendListeners(elementJustSend);
-                                }
-                            }
-
-                            // Prevent one callback from dominating the reactor thread. Break out of the write-loop if we have
-                            // written a certain amount.
-                            if (callbackBytesWritten > CALLBACK_MAX_BYTES_WRITEN) {
-                                newInterestedOps |= SelectionKey.OP_WRITE;
-                                callbackPreemtBecauseBytesWritten++;
-                                break;
-                            }
-                        } else if (outgoingBuffer != null || pendingOutputFilterData) {
-                            pendingOutputFilterData = false;
-
-                            if (outgoingBuffer != null) {
-                                totalBytesWrittenBeforeFilter += outgoingBuffer.remaining();
-                                if (isLastPartOfElement) {
-                                    assert currentlyOutgonigTopLevelStreamElement != null;
-                                    currentlyOutgoingElements.add(currentlyOutgonigTopLevelStreamElement);
-                                }
-                            }
-
-                            ByteBuffer outputFilterInputData = outgoingBuffer;
-                            // We can now null the outgoingBuffer since the filter step will take care of it from now on.
-                            outgoingBuffer = null;
-
-                            for (ListIterator<XmppInputOutputFilter> it = connectionInternal.getXmppInputOutputFilterBeginIterator(); it.hasNext();) {
-                                XmppInputOutputFilter inputOutputFilter = it.next();
-                                XmppInputOutputFilter.OutputResult outputResult;
-                                try {
-                                    outputResult = inputOutputFilter.output(outputFilterInputData, isLastPartOfElement,
-                                            destinationAddressChanged, moreDataAvailable);
-                                } catch (IOException e) {
-                                    connectionInternal.notifyConnectionError(e);
-                                    break writeLoop;
-                                }
-                                newPendingOutputFilterData |= outputResult.pendingFilterData;
-                                outputFilterInputData = outputResult.filteredOutputData;
-                                if (outputFilterInputData != null) {
-                                    outputFilterInputData.flip();
-                                }
-                            }
-
-                            // It is ok if outpuFilterInputData is 'null' here, this is expected behavior.
-                            if (outputFilterInputData != null && outputFilterInputData.hasRemaining()) {
-                                filteredOutgoingBuffer = outputFilterInputData;
-                            } else {
-                                filteredOutgoingBuffer = null;
-                            }
-
-                            // If the filters did eventually not produce any output data but if there is
-                            // pending output data then we have a pending write request after read.
-                            if (filteredOutgoingBuffer == null && newPendingOutputFilterData) {
-                                pendingWriteInterestAfterRead = true;
-                            }
-
-                            if (filteredOutgoingBuffer != null && isLastPartOfElement) {
-                                bufferToElementMap.put(filteredOutgoingBuffer, new ArrayList<>(currentlyOutgoingElements));
-                                currentlyOutgoingElements.clear();
-                            }
-
-                            // Reset that the destination address has changed.
-                            if (destinationAddressChanged) {
-                                destinationAddressChanged = false;
-                            }
-                        } else if (outgoingCharSequenceIterator != null) {
-                            CharSequence nextCharSequence = outgoingCharSequenceIterator.next();
-                            outgoingBuffer = UTF8.encode(nextCharSequence);
-                            if (!outgoingCharSequenceIterator.hasNext()) {
-                                outgoingCharSequenceIterator = null;
-                                isLastPartOfElement = true;
-                            } else {
-                                isLastPartOfElement = false;
-                            }
-
-                            final SmackDebugger debugger = connectionInternal.smackDebugger;
-                            if (debugger != null) {
-                                if (outgoingStreamForDebugger == null) {
-                                    outgoingStreamForDebugger = new StringBuilder();
-                                }
-                                outgoingStreamForDebugger.append(nextCharSequence);
-
-                                if (isLastPartOfElement) {
-                                    try {
-                                        outputDebugSplitter.append(outgoingStreamForDebugger);
-                                    } catch (IOException e) {
-                                        throw new AssertionError(e);
-                                    }
-                                    debugger.onOutgoingElementCompleted();
-                                    outgoingStreamForDebugger = null;
-                                }
-                            }
-                        } else if (!connectionInternal.outgoingElementsQueue.isEmpty()) {
-                            currentlyOutgonigTopLevelStreamElement = connectionInternal.outgoingElementsQueue.poll();
-                            if (currentlyOutgonigTopLevelStreamElement instanceof Stanza) {
-                                Stanza currentlyOutgoingStanza = (Stanza) currentlyOutgonigTopLevelStreamElement;
-                                Jid currentDestinationAddress = currentlyOutgoingStanza.getTo();
-                                destinationAddressChanged = !JidUtil.equals(lastDestinationAddress, currentDestinationAddress);
-                                lastDestinationAddress = currentDestinationAddress;
-                            }
-                            CharSequence nextCharSequence = currentlyOutgonigTopLevelStreamElement.toXML(StreamOpen.CLIENT_NAMESPACE);
-                            if (nextCharSequence instanceof XmlStringBuilder) {
-                                XmlStringBuilder xmlStringBuilder = (XmlStringBuilder) nextCharSequence;
-                                XmlEnvironment outgoingStreamXmlEnvironment = connectionInternal.getOutgoingStreamXmlEnvironment();
-                                outgoingCharSequenceIterator = xmlStringBuilder.toList(outgoingStreamXmlEnvironment).iterator();
-                            } else {
-                                outgoingCharSequenceIterator = Collections.singletonList(nextCharSequence).iterator();
-                            }
-                            assert outgoingCharSequenceIterator != null;
-                        } else {
-                            // There is nothing more to write.
-                            break;
-                        }
-                    }
-
-                    pendingOutputFilterData = newPendingOutputFilterData;
-                    if (!pendingWriteInterestAfterRead && pendingOutputFilterData) {
-                        newInterestedOps |= SelectionKey.OP_WRITE;
-                    }
-
-                    readLoop: while (true) {
-                        // Prevent one callback from dominating the reactor thread. Break out of the read-loop if we have
-                        // read a certain amount.
-                        if (callbackBytesRead > CALLBACK_MAX_BYTES_READ) {
-                            callbackPreemtBecauseBytesRead++;
-                            break;
-                        }
-
-                        int bytesRead;
-                        incomingBuffer.clear();
-                        try {
-                            bytesRead = selectedSocketChannel.read(incomingBuffer);
-                        } catch (IOException e) {
-                            handleReadWriteIoException(e);
-                            return;
-                        }
-
-                        if (bytesRead < 0) {
-                            LOGGER.finer("NIO read() returned " + bytesRead
-                                    + " for " + this + ". This probably means that the TCP connection was terminated.");
-                            // According to the socket channel javadoc section about "asynchronous reads" a socket channel's
-                            // read() may return -1 if the input side of a socket is shut down.
-
-                            // Note that we do not call notifyConnectionError() here because the connection may be
-                            // cleanly shutdown which would also cause read() to return '-1. I assume that this socket
-                            // will be selected again, on which read() would throw an IOException, which will be catched
-                            // and invoke notifyConnectionError() (see a few lines above).
-                            /*
-                            IOException exception = new IOException("NIO read() returned " + bytesRead);
-                            notifyConnectionError(exception);
-                            */
-                            return;
-                        }
-
-                        if (!pendingInputFilterData) {
-                            if (bytesRead == 0) {
-                                // Nothing more to read.
-                                break;
-                            }
-                        } else {
-                            pendingInputFilterData = false;
-                        }
-
-                        // We have successfully read something. It is now possible that a filter is now also able to write
-                        // additional data (for example SSLEngine).
-                        if (pendingWriteInterestAfterRead) {
-                            pendingWriteInterestAfterRead = false;
-                            newInterestedOps |= SelectionKey.OP_WRITE;
-                        }
-
-                        callbackBytesRead += bytesRead;
-
-                        ByteBuffer filteredIncomingBuffer = incomingBuffer;
-                        for (ListIterator<XmppInputOutputFilter> it = connectionInternal.getXmppInputOutputFilterEndIterator(); it.hasPrevious();) {
-                            filteredIncomingBuffer.flip();
-
-                            ByteBuffer newFilteredIncomingBuffer;
-                            try {
-                                newFilteredIncomingBuffer = it.previous().input(filteredIncomingBuffer);
-                            } catch (IOException e) {
-                                connectionInternal.notifyConnectionError(e);
-                                return;
-                            }
-                            if (newFilteredIncomingBuffer == null) {
-                                break readLoop;
-                            }
-                            filteredIncomingBuffer = newFilteredIncomingBuffer;
-                        }
-
-                        final int bytesReadAfterFilter = filteredIncomingBuffer.flip().remaining();
-
-                        totalBytesReadAfterFilter += bytesReadAfterFilter;
-
-                        try {
-                            splitter.write(filteredIncomingBuffer);
-                        } catch (IOException e) {
-                            connectionInternal.notifyConnectionError(e);
-                            return;
-                        }
-                    }
-                } finally {
-                    totalBytesWritten += callbackBytesWritten;
-                    totalBytesRead += callbackBytesRead;
-
-                    channelSelectedCallbackLock.unlock();
+                if (bytesRead < 0) {
+                    LOGGER.finer("NIO read() returned " + bytesRead
+                            + " for " + this + ". This probably means that the TCP connection was terminated.");
+                    // According to the socket channel javadoc section about "asynchronous reads" a socket channel's
+                    // read() may return -1 if the input side of a socket is shut down.
+                     // Note that we do not call notifyConnectionError() here because the connection may be
+                    // cleanly shutdown which would also cause read() to return '-1. I assume that this socket
+                    // will be selected again, on which read() would throw an IOException, which will be catched
+                    // and invoke notifyConnectionError() (see a few lines above).
+                    /*
+                    IOException exception = new IOException("NIO read() returned " + bytesRead);
+                    notifyConnectionError(exception);
+                    */
+                    return;
                 }
 
-                // Indicate that there is no reactor thread racing towards handling this selection key.
-                final SelectionKeyAttachment selectionKeyAttachment = this.selectionKeyAttachment;
-                if (selectionKeyAttachment != null) {
-                    selectionKeyAttachment.resetReactorThreadRacing();
+                if (!pendingInputFilterData) {
+                    if (bytesRead == 0) {
+                        // Nothing more to read.
+                        break;
+                    }
+                } else {
+                    pendingInputFilterData = false;
                 }
 
-                // Check the queue again to prevent lost wakeups caused by elements inserted before we
-                // called resetReactorThreadRacing() a few lines above.
-                if (!connectionInternal.outgoingElementsQueue.isEmpty()) {
-                    setWriteInterestAfterChannelSelectedCallback.incrementAndGet();
+                // We have successfully read something. It is now possible that a filter is now also able to write
+                // additional data (for example SSLEngine).
+                if (pendingWriteInterestAfterRead) {
+                    pendingWriteInterestAfterRead = false;
                     newInterestedOps |= SelectionKey.OP_WRITE;
                 }
 
-                connectionInternal.setInterestOps(selectionKey, newInterestedOps);
-            };
+                callbackBytesRead += bytesRead;
+
+                ByteBuffer filteredIncomingBuffer = incomingBuffer;
+                for (ListIterator<XmppInputOutputFilter> it = connectionInternal.getXmppInputOutputFilterEndIterator(); it.hasPrevious();) {
+                    filteredIncomingBuffer.flip();
+
+                    ByteBuffer newFilteredIncomingBuffer;
+                    try {
+                        newFilteredIncomingBuffer = it.previous().input(filteredIncomingBuffer);
+                    } catch (IOException e) {
+                        connectionInternal.notifyConnectionError(e);
+                        return;
+                    }
+                    if (newFilteredIncomingBuffer == null) {
+                        break readLoop;
+                    }
+                    filteredIncomingBuffer = newFilteredIncomingBuffer;
+                }
+
+                final int bytesReadAfterFilter = filteredIncomingBuffer.flip().remaining();
+
+                totalBytesReadAfterFilter += bytesReadAfterFilter;
+
+                try {
+                    splitter.write(filteredIncomingBuffer);
+                } catch (IOException e) {
+                    connectionInternal.notifyConnectionError(e);
+                    return;
+                }
+            }
+        } finally {
+            totalBytesWritten += callbackBytesWritten;
+            totalBytesRead += callbackBytesRead;
+
+            channelSelectedCallbackLock.unlock();
+        }
+
+        // Indicate that there is no reactor thread racing towards handling this selection key.
+        final SelectionKeyAttachment selectionKeyAttachment = this.selectionKeyAttachment;
+        if (selectionKeyAttachment != null) {
+            selectionKeyAttachment.resetReactorThreadRacing();
+        }
+
+        // Check the queue again to prevent lost wakeups caused by elements inserted before we
+        // called resetReactorThreadRacing() a few lines above.
+        if (!connectionInternal.outgoingElementsQueue.isEmpty()) {
+            setWriteInterestAfterChannelSelectedCallback.incrementAndGet();
+            newInterestedOps |= SelectionKey.OP_WRITE;
+        }
+
+        connectionInternal.setInterestOps(selectionKey, newInterestedOps);
+    }
 
     private void handleReadWriteIoException(IOException e) {
         if (e instanceof ClosedChannelException && !tcpNioTransport.isConnected()) {
@@ -677,7 +670,7 @@ public class XmppTcpTransportModule extends ModularXmppClientToServerConnectionM
         }
 
         @Override
-        public Stats getStats() {
+        public XmppTcpTransportModule.Stats getStats() {
             return XmppTcpTransportModule.this.getStats();
         }
 
@@ -774,7 +767,7 @@ public class XmppTcpTransportModule extends ModularXmppClientToServerConnectionM
             remoteAddress = (InetSocketAddress) socketChannel.socket().getRemoteSocketAddress();
 
             selectionKey = connectionInternal.registerWithSelector(socketChannel, SelectionKey.OP_READ,
-                            channelSelectedCallback);
+                            XmppTcpTransportModule.this::onChannelSelected);
             selectionKeyAttachment = (SelectionKeyAttachment) selectionKey.attachment();
 
             connectionInternal.setTransport(tcpNioTransport);
@@ -869,13 +862,7 @@ public class XmppTcpTransportModule extends ModularXmppClientToServerConnectionM
                         ConnectionUnexpectedTerminatedException, NoResponseException, NotConnectedException {
             connectionInternal.sendAndWaitForResponse(StartTls.INSTANCE, TlsProceed.class, TlsFailure.class);
 
-            SmackTlsContext smackTlsContext;
-            try {
-                smackTlsContext = connectionInternal.getSmackTlsContext();
-            } catch (KeyManagementException | UnrecoverableKeyException | NoSuchAlgorithmException
-                    | CertificateException | KeyStoreException | NoSuchProviderException e) {
-                throw new SmackWrappedException(e);
-            }
+            SmackTlsContext smackTlsContext = connectionInternal.getSmackTlsContext();
 
             tlsState = new TlsState(smackTlsContext);
             connectionInternal.addXmppInputOutputFilter(tlsState);
@@ -1316,7 +1303,7 @@ public class XmppTcpTransportModule extends ModularXmppClientToServerConnectionM
                 pendingOutputFilterData = true;
             }
 
-            channelSelectedCallback.onChannelSelected(channel, key);
+            onChannelSelected(channel, key);
         } finally {
             channelSelectedCallbackLock.unlock();
         }
@@ -1347,7 +1334,7 @@ public class XmppTcpTransportModule extends ModularXmppClientToServerConnectionM
         return CollectionUtil.removeUntil(buffers, b -> b.hasRemaining());
     }
 
-    public Stats getStats() {
+    public XmppTcpTransportModule.Stats getStats() {
         return new Stats(this);
     }
 

smack-tcp/src/main/java/org/jivesoftware/smack/tcp/rce/IpTcpRemoteConnectionEndpoint.java

@@ -16,18 +16,14 @@
  */
 package org.jivesoftware.smack.tcp.rce;
 
-import java.net.Inet4Address;
-import java.net.Inet6Address;
 import java.net.InetAddress;
 
 import org.jivesoftware.smack.datatypes.UInt16;
 import org.jivesoftware.smack.util.rce.SingleAddressRemoteConnectionEndpoint;
 
-import org.minidns.record.A;
-import org.minidns.record.AAAA;
 import org.minidns.record.InternetAddressRR;
 
-public final class IpTcpRemoteConnectionEndpoint<IARR extends InternetAddressRR>
+public final class IpTcpRemoteConnectionEndpoint<IARR extends InternetAddressRR<?>>
                 implements Rfc6120TcpRemoteConnectionEndpoint, SingleAddressRemoteConnectionEndpoint {
 
     private final CharSequence host;
@@ -42,17 +38,11 @@ public final class IpTcpRemoteConnectionEndpoint<IARR extends InternetAddressRR>
         this.internetAddressResourceRecord = internetAddressResourceRecord;
     }
 
-    public static IpTcpRemoteConnectionEndpoint<InternetAddressRR> from(CharSequence host, int port,
+    public static IpTcpRemoteConnectionEndpoint<InternetAddressRR<?>> from(CharSequence host, UInt16 port,
                     InetAddress inetAddress) {
-        InternetAddressRR internetAddressResourceRecord;
-        // TODO: Use InternetAddressRR.from(InetAddress) once MiniDNS is updated.
-        if (inetAddress instanceof Inet4Address) {
-            internetAddressResourceRecord = new A((Inet4Address) inetAddress);
-        } else {
-            internetAddressResourceRecord = new AAAA((Inet6Address) inetAddress);
-        }
+        InternetAddressRR<?> internetAddressResourceRecord = InternetAddressRR.from(inetAddress);
 
-        return new IpTcpRemoteConnectionEndpoint<InternetAddressRR>(host, UInt16.from(port),
+        return new IpTcpRemoteConnectionEndpoint<InternetAddressRR<?>>(host, port,
                         internetAddressResourceRecord);
     }
 

smack-tcp/src/main/java/org/jivesoftware/smack/tcp/rce/RemoteXmppTcpConnectionEndpoints.java

@@ -26,6 +26,7 @@ import java.util.logging.Logger;
 
 import org.jivesoftware.smack.ConnectionConfiguration;
 import org.jivesoftware.smack.ConnectionConfiguration.DnssecMode;
+import org.jivesoftware.smack.datatypes.UInt16;
 import org.jivesoftware.smack.util.DNSUtil;
 import org.jivesoftware.smack.util.dns.DNSResolver;
 import org.jivesoftware.smack.util.rce.RemoteConnectionEndpoint;
@@ -61,7 +62,7 @@ public class RemoteXmppTcpConnectionEndpoints {
         if (hostAddress != null) {
             lookupFailures = Collections.emptyList();
 
-            IpTcpRemoteConnectionEndpoint<InternetAddressRR> connectionEndpoint = IpTcpRemoteConnectionEndpoint.from(
+            IpTcpRemoteConnectionEndpoint<InternetAddressRR<?>> connectionEndpoint = IpTcpRemoteConnectionEndpoint.from(
                             hostAddress.toString(), config.getPort(), hostAddress);
             discoveredRemoteConnectionEndpoints = Collections.singletonList(connectionEndpoint);
         } else if (host != null) {
@@ -72,9 +73,9 @@ public class RemoteXmppTcpConnectionEndpoints {
 
             if (hostAddresses != null) {
                 discoveredRemoteConnectionEndpoints = new ArrayList<>(hostAddresses.size());
-                int port = config.getPort();
+                UInt16 port = config.getPort();
                 for (InetAddress inetAddress : hostAddresses) {
-                    IpTcpRemoteConnectionEndpoint<InternetAddressRR> connectionEndpoint = IpTcpRemoteConnectionEndpoint.from(
+                    IpTcpRemoteConnectionEndpoint<InternetAddressRR<?>> connectionEndpoint = IpTcpRemoteConnectionEndpoint.from(
                                     host, port, inetAddress);
                     discoveredRemoteConnectionEndpoints.add(connectionEndpoint);
                 }
@@ -198,13 +199,13 @@ public class RemoteXmppTcpConnectionEndpoints {
             LOGGER.info("Could not resolve DNS SRV resource records for " + srvDomain + ". Consider adding those.");
         }
 
-        int defaultPort;
+        UInt16 defaultPort;
         switch (domainType) {
         case client:
-            defaultPort = 5222;
+            defaultPort = UInt16.from(5222);
             break;
         case server:
-            defaultPort = 5269;
+            defaultPort = UInt16.from(5269);
             break;
         default:
             throw new AssertionError();
@@ -214,7 +215,7 @@ public class RemoteXmppTcpConnectionEndpoints {
         List<InetAddress> hostAddresses = dnsResolver.lookupHostAddress(domain, lookupFailures, dnssecMode);
         if (hostAddresses != null) {
             for (InetAddress inetAddress : hostAddresses) {
-                IpTcpRemoteConnectionEndpoint<InternetAddressRR> endpoint = IpTcpRemoteConnectionEndpoint.from(domain, defaultPort, inetAddress);
+                IpTcpRemoteConnectionEndpoint<InternetAddressRR<?>> endpoint = IpTcpRemoteConnectionEndpoint.from(domain, defaultPort, inetAddress);
                 endpoints.add(endpoint);
             }
         }

smack-tcp/src/test/java/org/jivesoftware/smack/tcp/PacketWriterTest.java

@@ -52,12 +52,12 @@ public class PacketWriterTest {
      * interrupt.
      *
      * @throws InterruptedException if the calling thread was interrupted.
-     * @throws BrokenBarrierException
+     * @throws BrokenBarrierException in case of a broken barrier.
      * @throws NotConnectedException if the XMPP connection is not connected.
      * @throws XmppStringprepException if the provided string is invalid.
      * @throws SecurityException if there was a security violation.
-     * @throws NoSuchFieldException
-     * @throws IllegalAccessException
+     * @throws NoSuchFieldException if there is no such field.
+     * @throws IllegalAccessException if there was an illegal access.
      * @throws IllegalArgumentException if an illegal argument was given.
      */
     @Test

version

@@ -1 +1 @@
-4.4.0-alpha3-SNAPSHOT
+4.4.0-alpha4-SNAPSHOT