Bump "Error Prone" to 2.0.15

and fix a few things :)

build.gradle

@@ -170,7 +170,7 @@ allprojects {
 	// version 52.0" error messages caused by the errorprone javac.
 	// See https://github.com/tbroyer/gradle-errorprone-plugin/issues/18 for more information.
 	configurations.errorprone {
-		resolutionStrategy.force 'com.google.errorprone:error_prone_core:2.0.5'
+		resolutionStrategy.force 'com.google.errorprone:error_prone_core:2.0.15'
 	}
 }
 

smack-bosh/src/main/java/org/jivesoftware/smack/bosh/BOSHConfiguration.java

@@ -55,6 +55,7 @@ public final class BOSHConfiguration extends ConnectionConfiguration {
         return proxy != null;
     }
 
+    @Override
     public ProxyInfo getProxyInfo() {
         return proxy;
     }

smack-bosh/src/main/java/org/jivesoftware/smack/bosh/XMPPBOSHConnection.java

@@ -203,11 +203,13 @@ public class XMPPBOSHConnection extends AbstractXMPPConnection {
         saslFeatureReceived.reportSuccess();
     }
 
+    @Override
     public boolean isSecureConnection() {
         // TODO: Implement SSL usage
         return false;
     }
 
+    @Override
     public boolean isUsingCompression() {
         // TODO: Implement compression
         return false;
@@ -313,15 +315,24 @@ public class XMPPBOSHConnection extends AbstractXMPPConnection {
     /**
      * Initialize the SmackDebugger which allows to log and debug XML traffic.
      */
+    @Override
     protected void initDebugger() {
         // TODO: Maybe we want to extend the SmackDebugger for simplification
         //       and a performance boost.
 
         // Initialize a empty writer which discards all data.
         writer = new Writer() {
-                public void write(char[] cbuf, int off, int len) { /* ignore */}
+            @Override
-                public void close() { /* ignore */ }
+            public void write(char[] cbuf, int off, int len) {
-                public void flush() { /* ignore */ }
+                /* ignore */}
+
+            @Override
+            public void close() {
+                /* ignore */ }
+
+            @Override
+            public void flush() {
+                /* ignore */ }
         };
 
         // Initialize a pipe for received raw data.
@@ -338,6 +349,7 @@ public class XMPPBOSHConnection extends AbstractXMPPConnection {
 
         // Add listeners for the received and sent raw data.
         client.addBOSHClientResponseListener(new BOSHClientResponseListener() {
+            @Override
             public void responseReceived(BOSHMessageEvent event) {
                 if (event.getBody() != null) {
                     try {
@@ -350,6 +362,7 @@ public class XMPPBOSHConnection extends AbstractXMPPConnection {
             }
         });
         client.addBOSHClientRequestListener(new BOSHClientRequestListener() {
+            @Override
             public void requestSent(BOSHMessageEvent event) {
                 if (event.getBody() != null) {
                     try {
@@ -366,6 +379,7 @@ public class XMPPBOSHConnection extends AbstractXMPPConnection {
             private Thread thread = this;
             private int bufferLength = 1024;
 
+            @Override
             public void run() {
                 try {
                     char[] cbuf = new char[bufferLength];
@@ -406,6 +420,7 @@ public class XMPPBOSHConnection extends AbstractXMPPConnection {
          * Process the connection listeners and try to login if the
          * connection was formerly authenticated and is now reconnected.
          */
+        @Override
         public void connectionEvent(BOSHClientConnEvent connEvent) {
             try {
                 if (connEvent.isConnected()) {
@@ -463,6 +478,7 @@ public class XMPPBOSHConnection extends AbstractXMPPConnection {
          *
          * @param event the BOSH client response which includes the received packet.
          */
+        @Override
         public void responseReceived(BOSHMessageEvent event) {
             AbstractBody body = event.getBody();
             if (body != null) {

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

@@ -1616,6 +1616,7 @@ public abstract class AbstractXMPPConnection implements XMPPConnection {
 
     private long lastStanzaReceived;
 
+    @Override
     public long getLastStanzaReceived() {
         return lastStanzaReceived;
     }

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

@@ -70,6 +70,7 @@ public final class ReconnectionManager {
 
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(XMPPConnection connection) {
                 if (connection instanceof AbstractXMPPConnection) {
                     ReconnectionManager.getInstanceFor((AbstractXMPPConnection) connection);
@@ -204,6 +205,7 @@ public final class ReconnectionManager {
             /**
              * The process will try the reconnection until the connection succeed or the user cancel it
              */
+            @Override
             public void run() {
                 final AbstractXMPPConnection connection = weakRefConnection.get();
                 if (connection == null) {

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

@@ -37,6 +37,7 @@ import org.jivesoftware.smack.sasl.core.SASLXOauth2Mechanism;
 import org.jivesoftware.smack.sasl.core.SCRAMSHA1Mechanism;
 import org.jivesoftware.smack.sasl.core.ScramSha1PlusMechanism;
 import org.jivesoftware.smack.util.FileUtils;
+import org.jivesoftware.smack.util.StringUtils;
 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
 import org.xmlpull.v1.XmlPullParserFactory;
@@ -60,7 +61,7 @@ public final class SmackInitialization {
     static {
         String smackVersion;
         try {
-            BufferedReader reader = new BufferedReader(new InputStreamReader(FileUtils.getStreamForUrl("classpath:org.jivesoftware.smack/version", null)));
+            BufferedReader reader = new BufferedReader(new InputStreamReader(FileUtils.getStreamForUrl("classpath:org.jivesoftware.smack/version", null), StringUtils.UTF8));
             smackVersion = reader.readLine();
             try {
                 reader.close();
@@ -232,7 +233,7 @@ public final class SmackInitialization {
             }
         }
         if (SmackInitializer.class.isAssignableFrom(initClass)) {
-            SmackInitializer initializer = (SmackInitializer) initClass.newInstance();
+            SmackInitializer initializer = (SmackInitializer) initClass.getConstructor().newInstance();
             List<Exception> exceptions = initializer.initialize();
             if (exceptions == null || exceptions.size() == 0) {
                 LOGGER.log(Level.FINE, "Loaded SmackInitializer " + className);

smack-core/src/main/java/org/jivesoftware/smack/debugger/AbstractDebugger.java

@@ -49,6 +49,7 @@ public abstract class AbstractDebugger implements SmackDebugger {
         // Create a special Reader that wraps the main Reader and logs data to the GUI.
         this.reader = new ObservableReader(reader);
         readerListener = new ReaderListener() {
+            @Override
             public void read(String str) {
                 log("RECV (" + connection.getConnectionCounter() + "): " + str);
             }
@@ -58,6 +59,7 @@ public abstract class AbstractDebugger implements SmackDebugger {
         // Create a special Writer that wraps the main Writer and logs data to the GUI.
         this.writer = new ObservableWriter(writer);
         writerListener = new WriterListener() {
+            @Override
             public void write(String str) {
                 log("SENT (" + connection.getConnectionCounter() + "): " + str);
             }
@@ -68,6 +70,7 @@ public abstract class AbstractDebugger implements SmackDebugger {
         // the GUI. This is what we call "interpreted" packet data, since it's the packet
         // data as Smack sees it and not as it's coming in as raw XML.
         listener = new StanzaListener() {
+            @Override
             public void processStanza(Stanza packet) {
                 if (printInterpreted) {
                     log("RCV PKT (" + connection.getConnectionCounter() + "): " + packet.toXML());
@@ -76,10 +79,12 @@ public abstract class AbstractDebugger implements SmackDebugger {
         };
 
         connListener = new ConnectionListener() {
+            @Override
             public void connected(XMPPConnection connection) {
                 log("XMPPConnection connected ("
                                 + connection + ")");
             }
+            @Override
             public void authenticated(XMPPConnection connection, boolean resumed) {
                 String logString = "XMPPConnection authenticated (" + connection + ")";
                 if (resumed) {
@@ -87,6 +92,7 @@ public abstract class AbstractDebugger implements SmackDebugger {
                 }
                 log(logString);
             }
+            @Override
             public void connectionClosed() {
                 log(
                        "XMPPConnection closed (" +
@@ -94,24 +100,28 @@ public abstract class AbstractDebugger implements SmackDebugger {
                         ")");
             }
 
+            @Override
             public void connectionClosedOnError(Exception e) {
                 log(
                         "XMPPConnection closed due to an exception (" +
                         connection +
                         ")", e);
             }
+            @Override
             public void reconnectionFailed(Exception e) {
                 log(
                         "Reconnection failed due to an exception (" +
                         connection +
                         ")", e);
             }
+            @Override
             public void reconnectionSuccessful() {
                 log(
                         "XMPPConnection reconnected (" +
                         connection +
                         ")");
             }
+            @Override
             public void reconnectingIn(int seconds) {
                 log(
                         "XMPPConnection (" +
@@ -125,6 +135,7 @@ public abstract class AbstractDebugger implements SmackDebugger {
 
     protected abstract void log(String logMessage, Throwable throwable);
 
+    @Override
     public Reader newConnectionReader(Reader newReader) {
         reader.removeReaderListener(readerListener);
         ObservableReader debugReader = new ObservableReader(newReader);
@@ -133,6 +144,7 @@ public abstract class AbstractDebugger implements SmackDebugger {
         return reader;
     }
 
+    @Override
     public Writer newConnectionWriter(Writer newWriter) {
         writer.removeWriterListener(writerListener);
         ObservableWriter debugWriter = new ObservableWriter(newWriter);
@@ -159,18 +171,22 @@ public abstract class AbstractDebugger implements SmackDebugger {
         connection.addConnectionListener(connListener);
     }
 
+    @Override
     public Reader getReader() {
         return reader;
     }
 
+    @Override
     public Writer getWriter() {
         return writer;
     }
 
+    @Override
     public StanzaListener getReaderListener() {
         return listener;
     }
 
+    @Override
     public StanzaListener getWriterListener() {
         return null;
     }

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

@@ -47,6 +47,7 @@ public abstract class AbstractFromToMatchesFilter implements StanzaFilter {
         this.ignoreResourcepart = ignoreResourcepart;
     }
 
+    @Override
     public final boolean accept(final Stanza stanza) {
         Jid stanzaAddress = getAddressToCompare(stanza);
 
@@ -63,6 +64,7 @@ public abstract class AbstractFromToMatchesFilter implements StanzaFilter {
 
     protected abstract Jid getAddressToCompare(Stanza stanza);
 
+    @Override
     public final String toString() {
         String matchMode = ignoreResourcepart ? "ignoreResourcepart" : "full";
         return getClass().getSimpleName() + " (" + matchMode + "): " + address;

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

@@ -44,6 +44,7 @@ public class AndFilter extends AbstractListFilter implements StanzaFilter {
         super(filters);
     }
 
+    @Override
     public boolean accept(Stanza packet) {
         for (StanzaFilter filter : filters) {
             if (!filter.accept(packet)) {

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

@@ -39,6 +39,7 @@ public class NotFilter implements StanzaFilter {
         this.filter = Objects.requireNonNull(filter, "Parameter must not be null.");
     }
 
+    @Override
     public boolean accept(Stanza packet) {
         return !filter.accept(packet);
     }

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

@@ -67,6 +67,7 @@ public class PacketExtensionFilter implements StanzaFilter {
         this(packetExtension.getElementName(), packetExtension.getNamespace());
     }
 
+    @Override
     public boolean accept(Stanza packet) {
         return packet.hasExtension(elementName, namespace);
     }

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

@@ -54,10 +54,12 @@ public class PacketIDFilter implements StanzaFilter {
         this.packetID = packetID;
     }
 
+    @Override
     public boolean accept(Stanza packet) {
         return packetID.equals(packet.getStanzaId());
     }
 
+    @Override
     public String toString() {
         return getClass().getSimpleName() + ": id=" + packetID;
     }

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

@@ -51,6 +51,7 @@ public class PacketTypeFilter implements StanzaFilter {
         this.packetType = packetType;
     }
 
+    @Override
     public boolean accept(Stanza packet) {
         return packetType.isInstance(packet);
     }

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

@@ -65,6 +65,7 @@ public class StanzaExtensionFilter implements StanzaFilter {
         this(packetExtension.getElementName(), packetExtension.getNamespace());
     }
 
+    @Override
     public boolean accept(Stanza packet) {
         return packet.hasExtension(elementName, namespace);
     }

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

@@ -47,10 +47,12 @@ public class StanzaIdFilter implements StanzaFilter {
         this.stanzaId = StringUtils.requireNotNullOrEmpty(stanzaID, "Stanza ID must not be null or empty.");
     }
 
+    @Override
     public boolean accept(Stanza stanza) {
         return stanzaId.equals(stanza.getStanzaId());
     }
 
+    @Override
     public String toString() {
         return getClass().getSimpleName() + ": id=" + stanzaId;
     }

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

@@ -51,6 +51,7 @@ public final class StanzaTypeFilter implements StanzaFilter {
         this.packetType = packetType;
     }
 
+    @Override
     public boolean accept(Stanza packet) {
         return packetType.isInstance(packet);
     }

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

@@ -70,6 +70,7 @@ public class DefaultExtensionElement implements ExtensionElement {
      *
      * @return the XML element name of the stanza(/packet) extension.
      */
+    @Override
     public String getElementName() {
         return elementName;
     }
@@ -79,6 +80,7 @@ public class DefaultExtensionElement implements ExtensionElement {
      *
      * @return the XML namespace of the stanza(/packet) extension.
      */
+    @Override
     public String getNamespace() {
         return namespace;
     }

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

@@ -570,6 +570,7 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
         }
 
 
+        @Override
         public int hashCode() {
             final int prime = 31;
             int result = 1;
@@ -578,6 +579,7 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
             return result;
         }
 
+        @Override
         public boolean equals(Object obj) {
             if (this == obj) {
                 return true;
@@ -632,6 +634,7 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
             return message;
         }
 
+        @Override
         public int hashCode() {
             final int prime = 31;
             int result = 1;
@@ -640,6 +643,7 @@ public final class Message extends Stanza implements TypedCloneable<Message> {
             return result;
         }
 
+        @Override
         public boolean equals(Object obj) {
             if (this == obj) {
                 return true;

smack-core/src/main/java/org/jivesoftware/smack/provider/IntrospectionProvider.java

@@ -78,7 +78,7 @@ public class IntrospectionProvider{
                     IOException, IllegalArgumentException, InvocationTargetException,
                     ClassNotFoundException {
         ParserUtils.assertAtStartTag(parser);
-        Object object = objectClass.newInstance();
+        Object object = objectClass.getConstructor().newInstance();
         outerloop: while (true) {
             int eventType = parser.next();
             switch (eventType) {

smack-core/src/main/java/org/jivesoftware/smack/provider/ProviderFileLoader.java

@@ -83,7 +83,8 @@ public class ProviderFileLoader implements ProviderLoader {
                                     // reflection later to create instances of the class.
                                     // Add the provider to the map.
                                     if (IQProvider.class.isAssignableFrom(provider)) {
-                                        iqProviders.add(new IQProviderInfo(elementName, namespace, (IQProvider<IQ>) provider.newInstance()));
+                                        IQProvider<IQ> iqProvider = (IQProvider<IQ>) provider.getConstructor().newInstance();
+                                        iqProviders.add(new IQProviderInfo(elementName, namespace, iqProvider));
                                     }
                                     else {
                                         exceptions.add(new IllegalArgumentException(className + " is not a IQProvider"));
@@ -96,7 +97,9 @@ public class ProviderFileLoader implements ProviderLoader {
                                     // then we'll use reflection later to create instances
                                     // of the class.
                                     if (ExtensionElementProvider.class.isAssignableFrom(provider)) {
-                                        extProviders.add(new ExtensionProviderInfo(elementName, namespace, (ExtensionElementProvider<ExtensionElement>) provider.newInstance()));
+                                        ExtensionElementProvider<ExtensionElement> extensionElementProvider = (ExtensionElementProvider<ExtensionElement>) provider.getConstructor().newInstance();
+                                        extProviders.add(new ExtensionProviderInfo(elementName, namespace,
+                                                        extensionElementProvider));
                                     }
                                     else {
                                         exceptions.add(new IllegalArgumentException(className
@@ -104,9 +107,10 @@ public class ProviderFileLoader implements ProviderLoader {
                                     }
                                     break;
                                 case "streamFeatureProvider":
+                                    ExtensionElementProvider<ExtensionElement> streamFeatureProvider = (ExtensionElementProvider<ExtensionElement>) provider.getConstructor().newInstance();
                                     sfProviders.add(new StreamFeatureProviderInfo(elementName,
                                                     namespace,
-                                                    (ExtensionElementProvider<ExtensionElement>) provider.newInstance()));
+                                                    streamFeatureProvider));
                                     break;
                                 default:
                                     LOGGER.warning("Unknown provider type: " + typeName);

smack-core/src/main/java/org/jivesoftware/smack/proxy/Socks4ProxySocketConnection.java

@@ -23,6 +23,8 @@ import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.Socket;
 
+import org.jivesoftware.smack.util.StringUtils;
+
 /**
  * Socket factory for socks4 proxy.
  *  
@@ -89,7 +91,8 @@ public class Socks4ProxySocketConnection implements ProxySocketConnection {
 
             if(user!=null)
             {
-                System.arraycopy(user.getBytes(), 0, buf, index, user.length());
+                byte[] userBytes = user.getBytes(StringUtils.UTF8);
+                System.arraycopy(userBytes, 0, buf, index, user.length());
                 index+=user.length();
             }
             buf[index++]=0;

smack-core/src/main/java/org/jivesoftware/smack/proxy/Socks5ProxySocketConnection.java

@@ -22,6 +22,8 @@ import java.io.OutputStream;
 import java.net.InetSocketAddress;
 import java.net.Socket;
 
+import org.jivesoftware.smack.util.StringUtils;
+
 /**
  * Socket factory for Socks5 proxy.
  * 
@@ -132,11 +134,13 @@ public class Socks5ProxySocketConnection implements ProxySocketConnection {
                     index=0;
                     buf[index++]=1;
                     buf[index++]=(byte)(user.length());
-                    System.arraycopy(user.getBytes(), 0, buf, index, 
+                    byte[] userBytes = user.getBytes(StringUtils.UTF8);
+                    System.arraycopy(userBytes, 0, buf, index, 
                         user.length());
                     index+=user.length();
-                    buf[index++]=(byte)(passwd.length());
+                    byte[] passwordBytes = user.getBytes(StringUtils.UTF8);
-                    System.arraycopy(passwd.getBytes(), 0, buf, index, 
+                    buf[index++]=(byte)(passwordBytes.length);
+                    System.arraycopy(passwordBytes, 0, buf, index, 
                         passwd.length());
                     index+=passwd.length();
 
@@ -210,7 +214,7 @@ public class Socks5ProxySocketConnection implements ProxySocketConnection {
             buf[index++]=1;       // CONNECT
             buf[index++]=0;
 
-            byte[] hostb= host.getBytes();
+            byte[] hostb= host.getBytes(StringUtils.UTF8);
             int len=hostb.length;
             buf[index++]=3;      // DOMAINNAME
             buf[index++]=(byte)(len);

smack-core/src/main/java/org/jivesoftware/smack/sasl/SASLMechanism.java

@@ -265,9 +265,10 @@ public abstract class SASLMechanism implements Comparable<SASLMechanism> {
         return null;
     }
 
+    @Override
     public final int compareTo(SASLMechanism other) {
         // Switch to Integer.compare(int, int) once Smack is on Android 19 or higher.
-        Integer ourPriority = new Integer(getPriority());
+        Integer ourPriority = getPriority();
         return ourPriority.compareTo(other.getPriority());
     }
 
@@ -300,7 +301,7 @@ public abstract class SASLMechanism implements Comparable<SASLMechanism> {
     }
 
     /**
-     * SASLprep the given String.
+     * SASLprep the given String. The resulting String is in UTF-8.
      * 
      * @param string the String to sasl prep.
      * @return the given String SASL preped

smack-core/src/main/java/org/jivesoftware/smack/sasl/core/SASLAnonymous.java

@@ -30,6 +30,7 @@ public class SASLAnonymous extends SASLMechanism {
 
     public static final String NAME = "ANONYMOUS";
 
+    @Override
     public String getName() {
         return NAME;
     }

smack-core/src/main/java/org/jivesoftware/smack/sasl/core/ScramMechanism.java

@@ -16,6 +16,7 @@
  */
 package org.jivesoftware.smack.sasl.core;
 
+import java.io.UnsupportedEncodingException;
 import java.security.InvalidKeyException;
 import java.security.SecureRandom;
 import java.util.Collections;
@@ -105,7 +106,15 @@ public abstract class ScramMechanism extends SASLMechanism {
 
     @Override
     protected byte[] evaluateChallenge(byte[] challenge) throws SmackException {
-        final String challengeString = new String(challenge);
+        String challengeString;
+        try {
+            // TODO: Where is it specified that this is an UTF-8 encoded string?
+            challengeString = new String(challenge, StringUtils.UTF8);
+        }
+        catch (UnsupportedEncodingException e) {
+            throw new AssertionError(e);
+        }
+
         switch (state) {
         case AUTH_TEXT_SENT:
             final String serverFirstMessage = challengeString;
@@ -358,14 +367,21 @@ public abstract class ScramMechanism extends SASLMechanism {
      * (PRF) and with dkLen == output length of HMAC() == output length of H().
      * </p>
      * 
-     * @param str
+     * @param normalizedPassword the normalized password.
      * @param salt
      * @param iterations
      * @return the result of the Hi function.
      * @throws SmackException 
      */
-    private byte[] hi(String str, byte[] salt, int iterations) throws SmackException {
+    private byte[] hi(String normalizedPassword, byte[] salt, int iterations) throws SmackException {
-        byte[] key = str.getBytes();
+        byte[] key;
+        try {
+            // According to RFC 5802 § 2.2, the resulting string of the normalization is also in UTF-8.
+            key = normalizedPassword.getBytes(StringUtils.UTF8);
+        }
+        catch (UnsupportedEncodingException e) {
+            throw new AssertionError();
+        }
         // U1 := HMAC(str, salt + INT(1))
         byte[] u = hmac(key, ByteUtils.concact(salt, ONE));
         byte[] res = u.clone();

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

@@ -240,6 +240,7 @@ public class ArrayBlockingQueueWithShutdown<E> extends AbstractQueue<E> implemen
      * @param e the element to add.
      * @throws InterruptedException if interrupted while waiting or if the queue was shut down.
      */
+    @Override
     public void put(E e) throws InterruptedException {
         checkNotNull(e);
         lock.lockInterruptibly();
@@ -452,6 +453,7 @@ public class ArrayBlockingQueueWithShutdown<E> extends AbstractQueue<E> implemen
             }
         }
 
+        @Override
         public boolean hasNext() {
             return nextIndex >= 0;
         }
@@ -469,6 +471,7 @@ public class ArrayBlockingQueueWithShutdown<E> extends AbstractQueue<E> implemen
             }
         }
 
+        @Override
         public E next() {
             lock.lock();
             try {
@@ -486,6 +489,7 @@ public class ArrayBlockingQueueWithShutdown<E> extends AbstractQueue<E> implemen
             }
         }
 
+        @Override
         public void remove() {
             lock.lock();
             try {

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

@@ -87,7 +87,8 @@ public final class FileUtils {
     public static boolean addLines(String url, Set<String> set) throws MalformedURLException, IOException {
         InputStream is = getStreamForUrl(url, null);
         if (is == null) return false;
-        BufferedReader br = new BufferedReader(new InputStreamReader(is));
+        InputStreamReader sr = new InputStreamReader(is, StringUtils.UTF8);
+        BufferedReader br = new BufferedReader(sr);
         String line;
         while ((line = br.readLine()) != null) {
             set.add(line);
@@ -102,6 +103,7 @@ public final class FileUtils {
      * @return the content of file or null in case of an error
      * @throws IOException 
      */
+    @SuppressWarnings("DefaultCharset")
     public static String readFileOrThrow(File file) throws FileNotFoundException, IOException {
         Reader reader = null;
         try {
@@ -132,6 +134,7 @@ public final class FileUtils {
         return null;
     }
 
+    @SuppressWarnings("DefaultCharset")
     public static void writeFileOrThrow(File file, CharSequence content) throws IOException {
         FileWriter writer = new FileWriter(file, false);
         try {

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

@@ -37,6 +37,7 @@ public class ObservableReader extends Reader {
         this.wrappedReader = wrappedReader;
     }
 
+    @Override
     public int read(char[] cbuf, int off, int len) throws IOException {
         int count = wrappedReader.read(cbuf, off, len);
         if (count > 0) {
@@ -54,34 +55,42 @@ public class ObservableReader extends Reader {
         return count;
     }
 
+    @Override
     public void close() throws IOException {
         wrappedReader.close();
     }
 
+    @Override
     public int read() throws IOException {
         return wrappedReader.read();
     }
 
+    @Override
     public int read(char[] cbuf) throws IOException {
         return wrappedReader.read(cbuf);
     }
 
+    @Override
     public long skip(long n) throws IOException {
         return wrappedReader.skip(n);
     }
 
+    @Override
     public boolean ready() throws IOException {
         return wrappedReader.ready();
     }
 
+    @Override
     public boolean markSupported() {
         return wrappedReader.markSupported();
     }
 
+    @Override
     public void mark(int readAheadLimit) throws IOException {
         wrappedReader.mark(readAheadLimit);
     }
 
+    @Override
     public void reset() throws IOException {
         wrappedReader.reset();
     }

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

@@ -38,36 +38,43 @@ public class ObservableWriter extends Writer {
         this.wrappedWriter = wrappedWriter;
     }
 
+    @Override
     public void write(char[] cbuf, int off, int len) throws IOException {
         wrappedWriter.write(cbuf, off, len);
         String str = new String(cbuf, off, len);
         maybeNotifyListeners(str);
     }
 
+    @Override
     public void flush() throws IOException {
         notifyListeners();
         wrappedWriter.flush();
     }
 
+    @Override
     public void close() throws IOException {
         wrappedWriter.close();
     }
 
+    @Override
     public void write(int c) throws IOException {
         wrappedWriter.write(c);
     }
 
+    @Override
     public void write(char[] cbuf) throws IOException {
         wrappedWriter.write(cbuf);
         String str = new String(cbuf);
         maybeNotifyListeners(str);
     }
 
+    @Override
     public void write(String str) throws IOException {
         wrappedWriter.write(str);
         maybeNotifyListeners(str);
     }
 
+    @Override
     public void write(String str, int off, int len) throws IOException {
         wrappedWriter.write(str, off, len);
         str = str.substring(off, off + len);

smack-core/src/main/java/org/jivesoftware/smack/util/stringencoder/Base32.java

@@ -20,6 +20,9 @@ package org.jivesoftware.smack.util.stringencoder;
 import java.io.ByteArrayOutputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+
+import org.jivesoftware.smack.util.StringUtils;
 
 /**
  * Base32 string encoding is useful for when filenames case-insensitive filesystems are encoded.
@@ -53,7 +56,13 @@ public class Base32 {
 
     public static String decode(String str) {
         ByteArrayOutputStream bs = new ByteArrayOutputStream();
-        byte[] raw = str.getBytes();
+        byte[] raw;
+        try {
+            raw = str.getBytes(StringUtils.UTF8);
+        }
+        catch (UnsupportedEncodingException e) {
+            throw new AssertionError(e);
+        }
         for (int i = 0; i < raw.length; i++) {
             char c = (char) raw[i];
             if (!Character.isWhitespace(c)) {
@@ -106,11 +115,24 @@ public class Base32 {
             }
         }
 
-        return new String(bs.toByteArray());
+        String res;
+        try {
+            res = new String(bs.toByteArray(), StringUtils.UTF8);
+        }
+        catch (UnsupportedEncodingException e) {
+            throw new AssertionError(e);
+        }
+        return res;
     }
 
     public static String encode(String str) {
-        byte[] b = str.getBytes();
+        byte[] b;
+        try {
+            b = str.getBytes(StringUtils.UTF8);
+        }
+        catch (UnsupportedEncodingException e) {
+            throw new AssertionError(e);
+        }
         ByteArrayOutputStream os = new ByteArrayOutputStream();
 
         for (int i = 0; i < (b.length + 4) / 5; i++) {
@@ -153,7 +175,14 @@ public class Base32 {
                 os.write(c);
             }
         }
-        return new String(os.toByteArray());
+        String res;
+        try {
+            res = new String(os.toByteArray(), StringUtils.UTF8);
+        }
+        catch (UnsupportedEncodingException e) {
+            throw new AssertionError(e);
+        }
+        return res;
     }
 
     private static int lenToPadding(int blocklen) {

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

@@ -180,6 +180,7 @@ public class DummyConnection extends AbstractXMPPConnection {
      *
      * @param packet the stanza(/packet) to process.
      */
+    @Override
     public void processStanza(Stanza packet) {
         invokeStanzaCollectorsAndNotifyRecvListeners(packet);
     }

smack-core/src/test/java/org/jivesoftware/smack/StanzaCollectorTest.java

@@ -176,7 +176,7 @@ public class StanzaCollectorTest
         assertNull(collector.pollResult());
     }
 
-    class OKEverything implements StanzaFilter
+    static class OKEverything implements StanzaFilter
     {
         @Override
         public boolean accept(Stanza packet)
@@ -186,7 +186,7 @@ public class StanzaCollectorTest
 
     }
 
-    class TestStanzaCollector extends StanzaCollector 
+    static class TestStanzaCollector extends StanzaCollector 
     {
         protected TestStanzaCollector(XMPPConnection conection, StanzaFilter packetFilter, int size)
         {
@@ -194,7 +194,7 @@ public class StanzaCollectorTest
         }
     }
 
-    class TestPacket extends Stanza
+    static class TestPacket extends Stanza
     {
         public TestPacket(int i)
         {

smack-core/src/test/java/org/jivesoftware/smack/sasl/DigestMd5SaslTest.java

@@ -19,6 +19,7 @@ package org.jivesoftware.smack.sasl;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
+import java.io.UnsupportedEncodingException;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -38,14 +39,14 @@ public class DigestMd5SaslTest extends AbstractSaslTest {
         super(saslMechanism);
     }
 
-    protected void runTest(boolean useAuthzid) throws NotConnectedException, SmackException, InterruptedException, XmppStringprepException {
+    protected void runTest(boolean useAuthzid) throws NotConnectedException, SmackException, InterruptedException, XmppStringprepException, UnsupportedEncodingException {
         EntityBareJid authzid = null;
         if (useAuthzid) {
             authzid = JidCreate.entityBareFrom("shazbat@xmpp.org");
         }
         saslMechanism.authenticate("florian", "irrelevant", JidCreate.domainBareFrom("xmpp.org"), "secret", authzid, null);
         byte[] response = saslMechanism.evaluateChallenge(challengeBytes);
-        String responseString = new String(response);
+        String responseString = new String(response, StringUtils.UTF8);
         String[] responseParts = responseString.split(",");
         Map<String, String> responsePairs = new HashMap<String, String>();
         for (String part : responseParts) {

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

@@ -851,6 +851,7 @@ public class PacketParserUtilsTest {
         XmlUnitUtils.assertSimilar(saslFailureString, saslFailure.toXML());
     }
 
+    @SuppressWarnings("ReferenceEquality")
     private static String determineNonDefaultLanguage() {
         String otherLanguage = "jp";
         Locale[] availableLocales = Locale.getAvailableLocales();

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

@@ -21,6 +21,8 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
+import java.io.UnsupportedEncodingException;
+
 import org.junit.Test;
 
 /**
@@ -72,16 +74,16 @@ public class StringUtilsTest  {
     }
 
     @Test
-    public void testEncodeHex() {
+    public void testEncodeHex() throws UnsupportedEncodingException {
         String input = "";
         String output = "";
-        assertEquals(new String(StringUtils.encodeHex(input.getBytes())),
+        assertEquals(new String(StringUtils.encodeHex(input.getBytes(StringUtils.UTF8))),
-                new String(output.getBytes()));
+                output);
 
         input = "foo bar 123";
         output = "666f6f2062617220313233";
-        assertEquals(new String(StringUtils.encodeHex(input.getBytes())),
+        assertEquals(new String(StringUtils.encodeHex(input.getBytes(StringUtils.UTF8))),
-                new String(output.getBytes()));
+                output);
     }
 
     @Test

smack-debug-slf4j/src/main/java/org/jivesoftware/smackx/debugger/slf4j/SLF4JLoggingConnectionListener.java

@@ -40,22 +40,27 @@ class SLF4JLoggingConnectionListener implements ConnectionListener {
         logger.debug("({}) Connection authenticated as {}", connection.hashCode(), connection.getUser());
     }
 
+    @Override
     public void connectionClosed() {
         logger.debug("({}) Connection closed", connection.hashCode());
     }
 
+    @Override
     public void connectionClosedOnError(Exception e) {
         logger.debug("({}) Connection closed due to an exception: {}", connection.hashCode(), e);
     }
 
+    @Override
     public void reconnectionFailed(Exception e) {
         logger.debug("({}) Reconnection failed due to an exception: {}", connection.hashCode(), e);
     }
 
+    @Override
     public void reconnectionSuccessful() {
         logger.debug("({}) Connection reconnected", connection.hashCode());
     }
 
+    @Override
     public void reconnectingIn(int seconds) {
         logger.debug("({}) Connection will reconnect in {}", connection.hashCode(), seconds);
     }

smack-debug-slf4j/src/main/java/org/jivesoftware/smackx/debugger/slf4j/SLF4JLoggingPacketListener.java

@@ -31,6 +31,7 @@ class SLF4JLoggingPacketListener implements StanzaListener {
         this.prefix = Validate.notNull(prefix);
     }
 
+    @Override
     public void processStanza(Stanza packet) {
         if (SLF4JSmackDebugger.printInterpreted.get() && logger.isDebugEnabled()) {
             logger.debug("{}: PKT [{}] '{}'", prefix, packet.getClass().getName(), packet.toXML());

smack-debug-slf4j/src/main/java/org/jivesoftware/smackx/debugger/slf4j/SLF4JRawXmlListener.java

@@ -28,10 +28,12 @@ class SLF4JRawXmlListener implements ReaderListener, WriterListener {
         this.logger = Validate.notNull(logger);
     }
 
+    @Override
     public void read(String str) {
         logger.debug("{}: {}", SLF4JSmackDebugger.RECEIVED_TAG, str);
     }
 
+    @Override
     public void write(String str) {
         logger.debug("{}: {}", SLF4JSmackDebugger.SENT_TAG, str);
     }

smack-debug/src/main/java/org/jivesoftware/smackx/debugger/EnhancedDebugger.java

@@ -208,8 +208,10 @@ public class EnhancedDebugger implements SmackDebugger {
         packetReaderListener = new StanzaListener() {
             SimpleDateFormat dateFormatter = new SimpleDateFormat("HH:mm:ss:SS");
 
+            @Override
             public void processStanza(final Stanza packet) {
                 SwingUtilities.invokeLater(new Runnable() {
+                    @Override
                     public void run() {
                         addReadPacketToTable(dateFormatter, packet);
                     }
@@ -223,8 +225,10 @@ public class EnhancedDebugger implements SmackDebugger {
         packetWriterListener = new StanzaListener() {
             SimpleDateFormat dateFormatter = new SimpleDateFormat("HH:mm:ss:SS");
 
+            @Override
             public void processStanza(final Stanza packet) {
                 SwingUtilities.invokeLater(new Runnable() {
+                    @Override
                     public void run() {
                         addSentPacketToTable(dateFormatter, packet);
                     }
@@ -235,8 +239,10 @@ public class EnhancedDebugger implements SmackDebugger {
 
         // Create a thread that will listen for any connection closed event
         connListener = new AbstractConnectionListener() {
+            @Override
             public void connectionClosed() {
                 SwingUtilities.invokeLater(new Runnable() {
+                    @Override
                     public void run() {
                         statusField.setValue("Closed");
                         EnhancedDebuggerWindow.connectionClosed(EnhancedDebugger.this);
@@ -245,8 +251,10 @@ public class EnhancedDebugger implements SmackDebugger {
 
             }
 
+            @Override
             public void connectionClosedOnError(final Exception e) {
                 SwingUtilities.invokeLater(new Runnable() {
+                    @Override
                     public void run() {
                         statusField.setValue("Closed due to an exception");
                         EnhancedDebuggerWindow.connectionClosedOnError(EnhancedDebugger.this, e);
@@ -254,16 +262,20 @@ public class EnhancedDebugger implements SmackDebugger {
                 });
 
             }
+            @Override
             public void reconnectingIn(final int seconds){
                 SwingUtilities.invokeLater(new Runnable() {
+                    @Override
                     public void run() {
                         statusField.setValue("Attempt to reconnect in " + seconds + " seconds");
                     }
                 });
             }
 
+            @Override
             public void reconnectionSuccessful() {
                 SwingUtilities.invokeLater(new Runnable() {
+                    @Override
                     public void run() {
                         statusField.setValue("Reconnection stablished");
                         EnhancedDebuggerWindow.connectionEstablished(EnhancedDebugger.this);
@@ -271,8 +283,10 @@ public class EnhancedDebugger implements SmackDebugger {
                 });
             }
 
+            @Override
             public void reconnectionFailed(Exception e) {
                 SwingUtilities.invokeLater(new Runnable() {
+                    @Override
                     public void run() {
                         statusField.setValue("Reconnection failed");
                     }
@@ -291,11 +305,13 @@ public class EnhancedDebugger implements SmackDebugger {
                         0) {
                     // CHECKSTYLE:OFF
         			private static final long serialVersionUID = 8136121224474217264L;
+					@Override
                     public boolean isCellEditable(int rowIndex, int mColIndex) {
                     // CHECKSTYLE:ON
                         return false;
                     }
 
+                    @Override
                     public Class<?> getColumnClass(int columnIndex) {
                         if (columnIndex == 2 || columnIndex == 3) {
                             return Icon.class;
@@ -344,6 +360,7 @@ public class EnhancedDebugger implements SmackDebugger {
         JPopupMenu menu = new JPopupMenu();
         JMenuItem menuItem1 = new JMenuItem("Copy");
         menuItem1.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 // Get the clipboard
                 Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
@@ -391,6 +408,7 @@ public class EnhancedDebugger implements SmackDebugger {
         menu = new JPopupMenu();
         menuItem1 = new JMenuItem("Copy");
         menuItem1.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 // Get the clipboard
                 Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
@@ -401,6 +419,7 @@ public class EnhancedDebugger implements SmackDebugger {
 
         JMenuItem menuItem2 = new JMenuItem("Clear");
         menuItem2.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 sentText.setText("");
             }
@@ -426,6 +445,7 @@ public class EnhancedDebugger implements SmackDebugger {
         menu = new JPopupMenu();
         menuItem1 = new JMenuItem("Copy");
         menuItem1.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 // Get the clipboard
                 Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
@@ -436,6 +456,7 @@ public class EnhancedDebugger implements SmackDebugger {
 
         menuItem2 = new JMenuItem("Clear");
         menuItem2.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 receivedText.setText("");
             }
@@ -449,8 +470,10 @@ public class EnhancedDebugger implements SmackDebugger {
         // Create a special Reader that wraps the main Reader and logs data to the GUI.
         ObservableReader debugReader = new ObservableReader(reader);
         readerListener = new ReaderListener() {
+            @Override
             public void read(final String str) {
                 SwingUtilities.invokeLater(new Runnable() {
+                    @Override
                     public void run() {
                         if (EnhancedDebuggerWindow.PERSISTED_DEBUGGER &&
                                 !EnhancedDebuggerWindow.getInstance().isVisible()) {
@@ -487,8 +510,10 @@ public class EnhancedDebugger implements SmackDebugger {
         // Create a special Writer that wraps the main Writer and logs data to the GUI.
         ObservableWriter debugWriter = new ObservableWriter(writer);
         writerListener = new WriterListener() {
+            @Override
             public void write(final String str) {
                 SwingUtilities.invokeLater(new Runnable() {
+                    @Override
                     public void run() {
                         if (EnhancedDebuggerWindow.PERSISTED_DEBUGGER &&
                                 !EnhancedDebuggerWindow.getInstance().isVisible()) {
@@ -536,6 +561,7 @@ public class EnhancedDebugger implements SmackDebugger {
         JPopupMenu menu = new JPopupMenu();
         JMenuItem menuItem = new JMenuItem("Message");
         menuItem.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 adhocMessages.setText(
                         "<message to=\"\" id=\""
@@ -547,6 +573,7 @@ public class EnhancedDebugger implements SmackDebugger {
 
         menuItem = new JMenuItem("IQ Get");
         menuItem.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 adhocMessages.setText(
                         "<iq type=\"get\" to=\"\" id=\""
@@ -558,6 +585,7 @@ public class EnhancedDebugger implements SmackDebugger {
 
         menuItem = new JMenuItem("IQ Set");
         menuItem.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 adhocMessages.setText(
                         "<iq type=\"set\" to=\"\" id=\""
@@ -569,6 +597,7 @@ public class EnhancedDebugger implements SmackDebugger {
 
         menuItem = new JMenuItem("Presence");
         menuItem.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 adhocMessages.setText(
                         "<presence to=\"\" id=\"" + StringUtils.randomString(5) + "-X\"/>");
@@ -579,6 +608,7 @@ public class EnhancedDebugger implements SmackDebugger {
 
         menuItem = new JMenuItem("Send");
         menuItem.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 if (!"".equals(adhocMessages.getText())) {
                     AdHocPacket packetToSend = new AdHocPacket(adhocMessages.getText());
@@ -595,6 +625,7 @@ public class EnhancedDebugger implements SmackDebugger {
 
         menuItem = new JMenuItem("Clear");
         menuItem.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 adhocMessages.setText(null);
             }
@@ -709,6 +740,7 @@ public class EnhancedDebugger implements SmackDebugger {
                         new Object[]{"Type", "Received", "Sent"}) {
                     // CHECKSTYLE:OFF
         			private static final long serialVersionUID = -6793886085109589269L;
+					@Override
                     public boolean isCellEditable(int rowIndex, int mColIndex) {
                     // CHECKSTYLE:ON
                         return false;
@@ -726,6 +758,7 @@ public class EnhancedDebugger implements SmackDebugger {
         tabbedPane.setToolTipTextAt(4, "Information and statistics about the debugged connection");
     }
 
+    @Override
     public Reader newConnectionReader(Reader newReader) {
         ((ObservableReader) reader).removeReaderListener(readerListener);
         ObservableReader debugReader = new ObservableReader(newReader);
@@ -734,6 +767,7 @@ public class EnhancedDebugger implements SmackDebugger {
         return reader;
     }
 
+    @Override
     public Writer newConnectionWriter(Writer newWriter) {
         ((ObservableWriter) writer).removeWriterListener(writerListener);
         ObservableWriter debugWriter = new ObservableWriter(newWriter);
@@ -746,6 +780,7 @@ public class EnhancedDebugger implements SmackDebugger {
     public void userHasLogged(final EntityFullJid user) {
         final EnhancedDebugger debugger = this;
         SwingUtilities.invokeLater(new Runnable() {
+            @Override
             public void run() {
                 userField.setText(user.toString());
                 EnhancedDebuggerWindow.userHasLogged(debugger, user.toString());
@@ -757,18 +792,22 @@ public class EnhancedDebugger implements SmackDebugger {
 
     }
 
+    @Override
     public Reader getReader() {
         return reader;
     }
 
+    @Override
     public Writer getWriter() {
         return writer;
     }
 
+    @Override
     public StanzaListener getReaderListener() {
         return packetReaderListener;
     }
 
+    @Override
     public StanzaListener getWriterListener() {
         return packetWriterListener;
     }
@@ -801,6 +840,7 @@ public class EnhancedDebugger implements SmackDebugger {
      */
     private void addReadPacketToTable(final SimpleDateFormat dateFormatter, final Stanza packet) {
         SwingUtilities.invokeLater(new Runnable() {
+            @Override
             public void run() {
                 String messageType;
                 Jid from = packet.getFrom();
@@ -862,6 +902,7 @@ public class EnhancedDebugger implements SmackDebugger {
      */
     private void addSentPacketToTable(final SimpleDateFormat dateFormatter, final Stanza packet) {
         SwingUtilities.invokeLater(new Runnable() {
+            @Override
             public void run() {
                 String messageType;
                 Jid to = packet.getTo();
@@ -978,9 +1019,9 @@ public class EnhancedDebugger implements SmackDebugger {
      * The whole text to send must be passed to the constructor. This implies that the client of
      * this class is responsible for sending a valid text to the constructor.
      */
-    private class AdHocPacket extends Stanza {
+    private static class AdHocPacket extends Stanza {
 
-        private String text;
+        private final String text;
 
         /**
          * Create a new AdHocPacket with the text to send. The passed text must be a valid text to
@@ -992,6 +1033,7 @@ public class EnhancedDebugger implements SmackDebugger {
             this.text = text;
         }
 
+        @Override
         public String toXML() {
             return text;
         }
@@ -1006,7 +1048,7 @@ public class EnhancedDebugger implements SmackDebugger {
     /**
      * Listens for debug window popup dialog events.
      */
-    private class PopupListener extends MouseAdapter {
+    private static class PopupListener extends MouseAdapter {
 
         JPopupMenu popup;
 
@@ -1014,10 +1056,12 @@ public class EnhancedDebugger implements SmackDebugger {
             popup = popupMenu;
         }
 
+        @Override
         public void mousePressed(MouseEvent e) {
             maybeShowPopup(e);
         }
 
+        @Override
         public void mouseReleased(MouseEvent e) {
             maybeShowPopup(e);
         }
@@ -1039,6 +1083,7 @@ public class EnhancedDebugger implements SmackDebugger {
             this.table = table;
         }
 
+        @Override
         public void valueChanged(ListSelectionEvent e) {
             if (table.getSelectedRow() == -1) {
                 // Clear the messageTextArea since there is none packet selected

smack-debug/src/main/java/org/jivesoftware/smackx/debugger/EnhancedDebuggerWindow.java

@@ -210,6 +210,7 @@ public final class EnhancedDebuggerWindow {
         if (!PERSISTED_DEBUGGER) {
             // Add listener for window closing event
             frame.addWindowListener(new WindowAdapter() {
+                @Override
                 public void windowClosing(WindowEvent evt) {
                     rootWindowClosing(evt);
                 }
@@ -280,6 +281,7 @@ public final class EnhancedDebuggerWindow {
         // Add a menu item that allows to close the current selected tab
         JMenuItem menuItem = new JMenuItem("Close");
         menuItem.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 // Remove the selected tab pane if it's not the Smack info pane
                 if (tabbedPane.getSelectedIndex() < tabbedPane.getComponentCount() - 1) {
@@ -301,6 +303,7 @@ public final class EnhancedDebuggerWindow {
         // Add a menu item that allows to close all the tabs that have their connections closed
         menuItem = new JMenuItem("Close All Not Active");
         menuItem.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 ArrayList<EnhancedDebugger> debuggersToRemove = new ArrayList<EnhancedDebugger>();
                 // Remove all the debuggers of which their connections are no longer valid
@@ -348,7 +351,7 @@ public final class EnhancedDebuggerWindow {
             debugger.cancel();
         }
         // Release any reference to the debuggers
-        debuggers.removeAll(debuggers);
+        debuggers.clear();
         // Release the default instance
         instance = null;
     }
@@ -356,7 +359,7 @@ public final class EnhancedDebuggerWindow {
     /**
      * Listens for debug window popup dialog events.
      */
-    private class PopupListener extends MouseAdapter {
+    private static class PopupListener extends MouseAdapter {
 
         JPopupMenu popup;
 
@@ -364,10 +367,12 @@ public final class EnhancedDebuggerWindow {
             popup = popupMenu;
         }
 
+        @Override
         public void mousePressed(MouseEvent e) {
             maybeShowPopup(e);
         }
 
+        @Override
         public void mouseReleased(MouseEvent e) {
             maybeShowPopup(e);
         }

smack-debug/src/main/java/org/jivesoftware/smackx/debugger/LiteDebugger.java

@@ -86,6 +86,7 @@ public class LiteDebugger implements SmackDebugger {
 
         // Add listener for window closing event 
         frame.addWindowListener(new WindowAdapter() {
+            @Override
             public void windowClosing(WindowEvent evt) {
                 rootWindowClosing(evt);
             }
@@ -114,6 +115,7 @@ public class LiteDebugger implements SmackDebugger {
         JPopupMenu menu = new JPopupMenu();
         JMenuItem menuItem1 = new JMenuItem("Copy");
         menuItem1.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 // Get the clipboard
                 Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
@@ -124,6 +126,7 @@ public class LiteDebugger implements SmackDebugger {
 
         JMenuItem menuItem2 = new JMenuItem("Clear");
         menuItem2.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 sentText1.setText("");
                 sentText2.setText("");
@@ -151,6 +154,7 @@ public class LiteDebugger implements SmackDebugger {
         menu = new JPopupMenu();
         menuItem1 = new JMenuItem("Copy");
         menuItem1.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 // Get the clipboard
                 Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
@@ -161,6 +165,7 @@ public class LiteDebugger implements SmackDebugger {
 
         menuItem2 = new JMenuItem("Clear");
         menuItem2.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 receivedText1.setText("");
                 receivedText2.setText("");
@@ -188,6 +193,7 @@ public class LiteDebugger implements SmackDebugger {
         menu = new JPopupMenu();
         menuItem1 = new JMenuItem("Copy");
         menuItem1.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 // Get the clipboard
                 Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
@@ -198,6 +204,7 @@ public class LiteDebugger implements SmackDebugger {
 
         menuItem2 = new JMenuItem("Clear");
         menuItem2.addActionListener(new ActionListener() {
+            @Override
             public void actionPerformed(ActionEvent e) {
                 interpretedText1.setText("");
                 interpretedText2.setText("");
@@ -219,6 +226,7 @@ public class LiteDebugger implements SmackDebugger {
         // Create a special Reader that wraps the main Reader and logs data to the GUI.
         ObservableReader debugReader = new ObservableReader(reader);
         readerListener = new ReaderListener() {
+                    @Override
                     public void read(String str) {
                         int index = str.lastIndexOf(">");
                         if (index != -1) {
@@ -242,6 +250,7 @@ public class LiteDebugger implements SmackDebugger {
         // Create a special Writer that wraps the main Writer and logs data to the GUI.
         ObservableWriter debugWriter = new ObservableWriter(writer);
         writerListener = new WriterListener() {
+                    @Override
                     public void write(String str) {
                         sentText1.append(str);
                         sentText2.append(str);
@@ -262,6 +271,7 @@ public class LiteDebugger implements SmackDebugger {
         // the GUI. This is what we call "interpreted" packet data, since it's the packet
         // data as Smack sees it and not as it's coming in as raw XML.
         listener = new StanzaListener() {
+            @Override
             public void processStanza(Stanza packet) {
                 interpretedText1.append(packet.toXML().toString());
                 interpretedText2.append(packet.toXML().toString());
@@ -286,17 +296,19 @@ public class LiteDebugger implements SmackDebugger {
     /**
      * Listens for debug window popup dialog events.
      */
-    private class PopupListener extends MouseAdapter {
+    private static class PopupListener extends MouseAdapter {
         JPopupMenu popup;
 
         PopupListener(JPopupMenu popupMenu) {
             popup = popupMenu;
         }
 
+        @Override
         public void mousePressed(MouseEvent e) {
             maybeShowPopup(e);
         }
 
+        @Override
         public void mouseReleased(MouseEvent e) {
             maybeShowPopup(e);
         }
@@ -308,6 +320,7 @@ public class LiteDebugger implements SmackDebugger {
         }
     }
 
+    @Override
     public Reader newConnectionReader(Reader newReader) {
         ((ObservableReader)reader).removeReaderListener(readerListener);
         ObservableReader debugReader = new ObservableReader(newReader);
@@ -316,6 +329,7 @@ public class LiteDebugger implements SmackDebugger {
         return reader;
     }
 
+    @Override
     public Writer newConnectionWriter(Writer newWriter) {
         ((ObservableWriter)writer).removeWriterListener(writerListener);
         ObservableWriter debugWriter = new ObservableWriter(newWriter);
@@ -332,18 +346,22 @@ public class LiteDebugger implements SmackDebugger {
         frame.setTitle(title);
     }
 
+    @Override
     public Reader getReader() {
         return reader;
     }
 
+    @Override
     public Writer getWriter() {
         return writer;
     }
 
+    @Override
     public StanzaListener getReaderListener() {
         return listener;
     }
 
+    @Override
     public StanzaListener getWriterListener() {
         return null;
     }

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

@@ -72,6 +72,7 @@ public final class CarbonManager extends Manager {
 
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(XMPPConnection connection) {
                 getInstanceFor(connection);
             }
@@ -271,6 +272,7 @@ public final class CarbonManager extends Manager {
 
         try {
             connection().sendIqWithResponseCallback(setIQ, new StanzaListener() {
+                @Override
                 public void processStanza(Stanza packet) {
                     enabled_state = use;
                 }

smack-experimental/src/main/java/org/jivesoftware/smackx/hoxt/packet/AbstractHttpOverXmpp.java

@@ -44,6 +44,7 @@ public abstract class AbstractHttpOverXmpp extends IQ {
         this.version = Objects.requireNonNull(builder.version, "version must not be null");
     }
 
+    @Override
     protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
         IQChildElementXmlStringBuilder builder = getIQHoxtChildElementBuilder(xml);
         builder.optAppend(headers);

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/IoTSetRequest.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright © 2016 Florian Schmaus
+ * Copyright © 2016-2017 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@
  */
 package org.jivesoftware.smackx.iot.control.element;
 
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 
@@ -31,7 +32,21 @@ public class IoTSetRequest extends IQ {
     public IoTSetRequest(Collection<? extends SetData> setData) {
         super(ELEMENT, NAMESPACE);
         setType(Type.set);
-        this.setData = Collections.unmodifiableCollection(setData);
+
+        /*
+         * Ugly workaround for the following error prone false positive:
+         * 
+         * IoTSetRequest.java:34: error: incompatible types: Collection<CAP#1> cannot be converted to Collection<SetData>
+         * this.setData = Collections.unmodifiableCollection(setDataA);
+         *                                                  ^
+         * where CAP#1 is a fresh type-variable:
+         * CAP#1 extends SetData from capture of ? extends SetData
+         */
+        Collection<SetData> tmp = new ArrayList<>(setData.size());
+        for (SetData data : setData) {
+            tmp.add(data);
+        }
+        this.setData = Collections.unmodifiableCollection(tmp);
     }
 
     public Collection<SetData> getSetData() {

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/SetData.java

@@ -30,7 +30,7 @@ public abstract class SetData implements NamedElement {
         DOUBLE,
         ;
 
-        private String toStringCache;
+        private final String toStringCache;
 
         private Type() {
             toStringCache = this.name().toLowerCase(Locale.US);

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/IoTDataManager.java

@@ -61,6 +61,7 @@ public final class IoTDataManager extends IoTManager {
     // Ensure a IoTDataManager exists for every connection.
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(XMPPConnection connection) {
                 if (!isAutoEnableActive()) return;
                 getInstanceFor(connection);

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/IoTDiscoveryManager.java

@@ -74,6 +74,7 @@ public final class IoTDiscoveryManager extends Manager {
     // Ensure a IoTProvisioningManager exists for every connection.
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(XMPPConnection connection) {
                 if (!IoTManager.isAutoEnableActive()) return;
                 getInstanceFor(connection);

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/element/NodeInfo.java

@@ -62,6 +62,7 @@ public final class NodeInfo {
     }
 
     @Override
+    @SuppressWarnings("ReferenceEquality")
     public int hashCode() {
         if (this == EMPTY) {
             return 0;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/IoTProvisioningManager.java

@@ -82,6 +82,7 @@ public final class IoTProvisioningManager extends Manager {
     // Ensure a IoTProvisioningManager exists for every connection.
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(XMPPConnection connection) {
                 if (!IoTManager.isAutoEnableActive()) return;
                 getInstanceFor(connection);

smack-extensions/src/main/java/org/jivesoftware/smack/chat2/ChatManager.java

@@ -53,6 +53,7 @@ import org.jxmpp.jid.Jid;
  *
  * @see <a href="https://xmpp.org/extensions/xep-0296.html">XEP-0296: Best Practices for Resource Locking</a>
  */
+@SuppressWarnings("FunctionalInterfaceClash")
 public final class ChatManager extends Manager {
 
     private static final Map<XMPPConnection, ChatManager> INSTANCES = new WeakHashMap<>();
@@ -188,22 +189,84 @@ public final class ChatManager extends Manager {
         return true;
     }
 
-    public boolean addListener(IncomingChatMessageListener listener) {
+    /**
+     * Add a new listener for incoming chat messages.
+     *
+     * @param listener the listener to add.
+     * @return <code>true</code> if the listener was not already added.
+     */
+    public boolean addIncomingListener(IncomingChatMessageListener listener) {
         return incomingListeners.add(listener);
     }
 
+    /**
+     * Add a new listener for incoming chat messages.
+     *
+     * @param listener the listener to add.
+     * @return <code>true</code> if the listener was not already added.
+     */
+    @Deprecated
+    @SuppressWarnings("FunctionalInterfaceClash")
+    public boolean addListener(IncomingChatMessageListener listener) {
+        return addIncomingListener(listener);
+    }
+
+    /**
+     * Remove an incoming chat message listener.
+     *
+     * @param listener the listener to remove.
+     * @return <code>true</code> if the listener was active and got removed.
+     */
+    @SuppressWarnings("FunctionalInterfaceClash")
     public boolean removeListener(IncomingChatMessageListener listener) {
         return incomingListeners.remove(listener);
     }
 
-    public boolean addListener(OutgoingChatMessageListener listener) {
+    /**
+     * Add a new listener for outgoing chat messages.
+     *
+     * @param listener the listener to add.
+     * @return <code>true</code> if the listener was not already added.
+     */
+    public boolean addOutgoingListener(OutgoingChatMessageListener listener) {
         return outgoingListeners.add(listener);
     }
 
-    public boolean removeOutoingLIstener(OutgoingChatMessageListener listener) {
+    /**
+     * Add a new listener for incoming chat messages.
+     *
+     * @param listener the listener to add.
+     * @return <code>true</code> if the listener was not already added.
+     * @deprecated use {@link #addOutgoingListener(OutgoingChatMessageListener)} instead.
+     */
+    @Deprecated
+    @SuppressWarnings("FunctionalInterfaceClash")
+    public boolean addListener(OutgoingChatMessageListener listener) {
+        return addOutgoingListener(listener);
+    }
+
+    /**
+     * Remove an outgoing chat message listener.
+     *
+     * @param listener the listener to remove.
+     * @return <code>true</code> if the listener was active and got removed.
+     */
+    public boolean removeListener(OutgoingChatMessageListener listener) {
         return outgoingListeners.remove(listener);
     }
 
+    /**
+     * Remove an outgoing chat message listener.
+     *
+     * @param listener the listener to remove.
+     * @return <code>true</code> if the listener was active and got removed.
+     * @deprecated use {@link #removeListener(OutgoingChatMessageListener)} instead.
+     */
+    @Deprecated
+    public boolean removeOutoingLIstener(OutgoingChatMessageListener listener) {
+        return removeListener(listener);
+    }
+
     /**
      * Start a new or retrieve the existing chat with <code>jid</code>.
      *

smack-extensions/src/main/java/org/jivesoftware/smackx/amp/AMPManager.java

@@ -40,6 +40,7 @@ public class AMPManager {
     // The ServiceDiscoveryManager class should have been already initialized
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(XMPPConnection connection) {
                 AMPManager.setServiceEnabled(connection, true);
             }

smack-extensions/src/main/java/org/jivesoftware/smackx/attention/packet/AttentionExtension.java

@@ -47,6 +47,7 @@ public class AttentionExtension implements ExtensionElement {
      * 
      * @see org.jivesoftware.smack.packet.PacketExtension#getElementName()
      */
+    @Override
     public String getElementName() {
         return ELEMENT_NAME;
     }
@@ -56,6 +57,7 @@ public class AttentionExtension implements ExtensionElement {
      * 
      * @see org.jivesoftware.smack.packet.PacketExtension#getNamespace()
      */
+    @Override
     public String getNamespace() {
         return NAMESPACE;
     }
@@ -65,6 +67,7 @@ public class AttentionExtension implements ExtensionElement {
      * 
      * @see org.jivesoftware.smack.packet.PacketExtension#toXML()
      */
+    @Override
     public String toXML() {
         final StringBuilder sb = new StringBuilder();
         sb.append('<').append(getElementName()).append(" xmlns=\"").append(

smack-extensions/src/main/java/org/jivesoftware/smackx/bookmarks/BookmarkedConference.java

@@ -131,6 +131,7 @@ public class BookmarkedConference implements SharedBookmark {
         this.isShared = isShared;
     }
 
+    @Override
     public boolean isShared() {
         return isShared;
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/bookmarks/BookmarkedURL.java

@@ -102,6 +102,7 @@ public class BookmarkedURL implements SharedBookmark {
         this.isShared = shared;
     }
 
+    @Override
     public boolean isShared() {
         return isShared;
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/bookmarks/Bookmarks.java

@@ -151,6 +151,7 @@ public class Bookmarks implements PrivateData {
      *
      * @return the element name.
      */
+    @Override
     public String getElementName() {
         return ELEMENT;
     }
@@ -160,6 +161,7 @@ public class Bookmarks implements PrivateData {
      *
      * @return the namespace.
      */
+    @Override
     public String getNamespace() {
         return NAMESPACE;
     }
@@ -218,6 +220,7 @@ public class Bookmarks implements PrivateData {
             super();
         }
 
+        @Override
         public PrivateData parsePrivateData(XmlPullParser parser) throws XmlPullParserException, IOException {
             Bookmarks storage = new Bookmarks();
 

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/ibb/InBandBytestreamListener.java

@@ -34,6 +34,7 @@ public abstract class InBandBytestreamListener implements BytestreamListener {
 
 
 
+    @Override
     public void incomingBytestreamRequest(BytestreamRequest request) {
         incomingBytestreamRequest((InBandBytestreamRequest) request);
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/ibb/InBandBytestreamManager.java

@@ -103,6 +103,7 @@ public final class InBandBytestreamManager implements BytestreamManager {
      */
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(final XMPPConnection connection) {
                 // create the manager for this connection
                 InBandBytestreamManager.getByteStreamManager(connection);
@@ -236,6 +237,7 @@ public final class InBandBytestreamManager implements BytestreamManager {
      * 
      * @param listener the listener to register
      */
+    @Override
     public void addIncomingBytestreamListener(BytestreamListener listener) {
         this.allRequestListeners.add(listener);
     }
@@ -246,6 +248,7 @@ public final class InBandBytestreamManager implements BytestreamManager {
      * 
      * @param listener the listener to remove
      */
+    @Override
     public void removeIncomingBytestreamListener(BytestreamListener listener) {
         this.allRequestListeners.remove(listener);
     }
@@ -268,6 +271,7 @@ public final class InBandBytestreamManager implements BytestreamManager {
      * @param listener the listener to register
      * @param initiatorJID the JID of the user that wants to establish an In-Band Bytestream
      */
+    @Override
     public void addIncomingBytestreamListener(BytestreamListener listener, Jid initiatorJID) {
         this.userListeners.put(initiatorJID, listener);
     }
@@ -277,6 +281,9 @@ public final class InBandBytestreamManager implements BytestreamManager {
      * 
      * @param initiatorJID the JID of the user the listener should be removed
      */
+    @Override
+    // TODO: Change argument to Jid in Smack 4.3.
+    @SuppressWarnings("CollectionIncompatibleType")
     public void removeIncomingBytestreamListener(String initiatorJID) {
         this.userListeners.remove(initiatorJID);
     }
@@ -402,6 +409,7 @@ public final class InBandBytestreamManager implements BytestreamManager {
      * @throws SmackException if there was no response from the server.
      * @throws InterruptedException 
      */
+    @Override
     public InBandBytestreamSession establishSession(Jid targetJID) throws XMPPException, SmackException, InterruptedException {
         String sessionID = getNextSessionID();
         return establishSession(targetJID, sessionID);
@@ -420,6 +428,7 @@ public final class InBandBytestreamManager implements BytestreamManager {
      * @throws NotConnectedException 
      * @throws InterruptedException 
      */
+    @Override
     public InBandBytestreamSession establishSession(Jid targetJID, String sessionID)
                     throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
         Open byteStreamRequest = new Open(sessionID, this.defaultBlockSize, this.stanza);

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/ibb/InBandBytestreamRequest.java

@@ -50,6 +50,7 @@ public class InBandBytestreamRequest implements BytestreamRequest {
      * 
      * @return the sender of the In-Band Bytestream open request
      */
+    @Override
     public Jid getFrom() {
         return this.byteStreamRequest.getFrom();
     }
@@ -59,6 +60,7 @@ public class InBandBytestreamRequest implements BytestreamRequest {
      * 
      * @return the session ID of the In-Band Bytestream open request
      */
+    @Override
     public String getSessionID() {
         return this.byteStreamRequest.getSessionID();
     }
@@ -71,6 +73,7 @@ public class InBandBytestreamRequest implements BytestreamRequest {
      * @throws NotConnectedException 
      * @throws InterruptedException 
      */
+    @Override
     public InBandBytestreamSession accept() throws NotConnectedException, InterruptedException {
         XMPPConnection connection = this.manager.getConnection();
 
@@ -92,6 +95,7 @@ public class InBandBytestreamRequest implements BytestreamRequest {
      * @throws NotConnectedException 
      * @throws InterruptedException 
      */
+    @Override
     public void reject() throws NotConnectedException, InterruptedException {
         this.manager.replyRejectPacket(this.byteStreamRequest);
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/ibb/InBandBytestreamSession.java

@@ -109,18 +109,22 @@ public class InBandBytestreamSession implements BytestreamSession {
 
     }
 
+    @Override
     public InputStream getInputStream() {
         return this.inputStream;
     }
 
+    @Override
     public OutputStream getOutputStream() {
         return this.outputStream;
     }
 
+    @Override
     public int getReadTimeout() {
         return this.inputStream.readTimeout;
     }
 
+    @Override
     public void setReadTimeout(int timeout) {
         if (timeout < 0) {
             throw new IllegalArgumentException("Timeout must be >= 0");
@@ -151,6 +155,7 @@ public class InBandBytestreamSession implements BytestreamSession {
         this.closeBothStreamsEnabled = closeBothStreamsEnabled;
     }
 
+    @Override
     public void close() throws IOException {
         closeByLocal(true); // close input stream
         closeByLocal(false); // close output stream
@@ -224,7 +229,9 @@ public class InBandBytestreamSession implements BytestreamSession {
             this.inputStream.cleanup();
 
             // remove session from manager
-            InBandBytestreamManager.getByteStreamManager(this.connection).getSessions().remove(this);
+            // Thanks Google Error Prone for finding the bug where remove() was called with 'this' as argument. Changed
+            // now to remove(byteStreamRequest.getSessionID).
+            InBandBytestreamManager.getByteStreamManager(this.connection).getSessions().remove(byteStreamRequest.getSessionID());
         }
 
     }
@@ -283,6 +290,7 @@ public class InBandBytestreamSession implements BytestreamSession {
          */
         protected abstract StanzaFilter getDataPacketFilter();
 
+        @Override
         public synchronized int read() throws IOException {
             checkClosed();
 
@@ -298,6 +306,7 @@ public class InBandBytestreamSession implements BytestreamSession {
             return buffer[bufferPointer++] & 0xff;
         }
 
+        @Override
         public synchronized int read(byte[] b, int off, int len) throws IOException {
             if (b == null) {
                 throw new NullPointerException();
@@ -331,6 +340,7 @@ public class InBandBytestreamSession implements BytestreamSession {
             return len;
         }
 
+        @Override
         public synchronized int read(byte[] b) throws IOException {
             return read(b, 0, b.length);
         }
@@ -405,10 +415,12 @@ public class InBandBytestreamSession implements BytestreamSession {
             }
         }
 
+        @Override
         public boolean markSupported() {
             return false;
         }
 
+        @Override
         public void close() throws IOException {
             if (closeInvoked) {
                 return;
@@ -444,11 +456,13 @@ public class InBandBytestreamSession implements BytestreamSession {
      */
     private class IQIBBInputStream extends IBBInputStream {
 
+        @Override
         protected StanzaListener getDataPacketListener() {
             return new StanzaListener() {
 
                 private long lastSequence = -1;
 
+                @Override
                 public void processStanza(Stanza packet) throws NotConnectedException, InterruptedException {
                     // get data packet extension
                     DataPacketExtension data = ((Data) packet).getDataPacketExtension();
@@ -491,6 +505,7 @@ public class InBandBytestreamSession implements BytestreamSession {
             };
         }
 
+        @Override
         protected StanzaFilter getDataPacketFilter() {
             /*
              * filter all IQ stanzas having type 'SET' (represented by Data class), containing a
@@ -507,9 +522,11 @@ public class InBandBytestreamSession implements BytestreamSession {
      */
     private class MessageIBBInputStream extends IBBInputStream {
 
+        @Override
         protected StanzaListener getDataPacketListener() {
             return new StanzaListener() {
 
+                @Override
                 public void processStanza(Stanza packet) {
                     // get data packet extension
                     DataPacketExtension data = (DataPacketExtension) packet.getExtension(
@@ -555,6 +572,7 @@ public class InBandBytestreamSession implements BytestreamSession {
      */
     private class IBBDataPacketFilter implements StanzaFilter {
 
+        @Override
         public boolean accept(Stanza packet) {
             // sender equals remote peer
             if (!packet.getFrom().equals(remoteJID)) {
@@ -619,6 +637,7 @@ public class InBandBytestreamSession implements BytestreamSession {
          */
         protected abstract void writeToXML(DataPacketExtension data) throws IOException, NotConnectedException, InterruptedException;
 
+        @Override
         public synchronized void write(int b) throws IOException {
             if (this.isClosed) {
                 throw new IOException("Stream is closed");
@@ -632,6 +651,7 @@ public class InBandBytestreamSession implements BytestreamSession {
             buffer[bufferPointer++] = (byte) b;
         }
 
+        @Override
         public synchronized void write(byte[] b, int off, int len) throws IOException {
             if (b == null) {
                 throw new NullPointerException();
@@ -662,6 +682,7 @@ public class InBandBytestreamSession implements BytestreamSession {
             }
         }
 
+        @Override
         public synchronized void write(byte[] b) throws IOException {
             write(b, 0, b.length);
         }
@@ -698,6 +719,7 @@ public class InBandBytestreamSession implements BytestreamSession {
             bufferPointer += len - available;
         }
 
+        @Override
         public synchronized void flush() throws IOException {
             if (this.isClosed) {
                 throw new IOException("Stream is closed");
@@ -735,6 +757,7 @@ public class InBandBytestreamSession implements BytestreamSession {
 
         }
 
+        @Override
         public void close() throws IOException {
             if (isClosed) {
                 return;

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/ibb/InitiationListener.java

@@ -66,6 +66,7 @@ class InitiationListener extends AbstractIqRequestHandler {
     public IQ handleIQRequest(final IQ packet) {
         initiationListenerExecutor.execute(new Runnable() {
 
+            @Override
             public void run() {
                 try {
                     processRequest(packet);

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/ibb/packet/DataPacketExtension.java

@@ -126,10 +126,12 @@ public class DataPacketExtension implements ExtensionElement {
         return this.decodedData;
     }
 
+    @Override
     public String getElementName() {
         return ELEMENT;
     }
 
+    @Override
     public String getNamespace() {
         return NAMESPACE;
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/socks5/InitiationListener.java

@@ -62,6 +62,7 @@ final class InitiationListener extends AbstractIqRequestHandler {
     public IQ handleIQRequest(final IQ packet) {
         initiationListenerExecutor.execute(new Runnable() {
 
+            @Override
             public void run() {
                 try {
                     processRequest(packet);

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/socks5/Socks5BytestreamListener.java

@@ -32,6 +32,7 @@ import org.jivesoftware.smackx.bytestreams.BytestreamRequest;
  */
 public abstract class Socks5BytestreamListener implements BytestreamListener {
 
+    @Override
     public void incomingBytestreamRequest(BytestreamRequest request) {
         incomingBytestreamRequest((Socks5BytestreamRequest) request);
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/socks5/Socks5BytestreamManager.java

@@ -98,6 +98,7 @@ public final class Socks5BytestreamManager extends Manager implements Bytestream
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
 
+            @Override
             public void connectionCreated(final XMPPConnection connection) {
                 // create the manager for this connection
                 Socks5BytestreamManager.getBytestreamManager(connection);
@@ -198,6 +199,7 @@ public final class Socks5BytestreamManager extends Manager implements Bytestream
      * 
      * @param listener the listener to register
      */
+    @Override
     public void addIncomingBytestreamListener(BytestreamListener listener) {
         this.allRequestListeners.add(listener);
     }
@@ -208,6 +210,7 @@ public final class Socks5BytestreamManager extends Manager implements Bytestream
      * 
      * @param listener the listener to remove
      */
+    @Override
     public void removeIncomingBytestreamListener(BytestreamListener listener) {
         this.allRequestListeners.remove(listener);
     }
@@ -230,6 +233,7 @@ public final class Socks5BytestreamManager extends Manager implements Bytestream
      * @param listener the listener to register
      * @param initiatorJID the JID of the user that wants to establish a SOCKS5 Bytestream
      */
+    @Override
     public void addIncomingBytestreamListener(BytestreamListener listener, Jid initiatorJID) {
         this.userListeners.put(initiatorJID, listener);
     }
@@ -239,6 +243,9 @@ public final class Socks5BytestreamManager extends Manager implements Bytestream
      * 
      * @param initiatorJID the JID of the user the listener should be removed
      */
+    // TODO: Change parameter to Jid in Smack 4.3.
+    @Override
+    @SuppressWarnings("CollectionIncompatibleType")
     public void removeIncomingBytestreamListener(String initiatorJID) {
         this.userListeners.remove(initiatorJID);
     }
@@ -386,6 +393,7 @@ public final class Socks5BytestreamManager extends Manager implements Bytestream
      * @throws InterruptedException if the current thread was interrupted while waiting
      * @throws SmackException if there was no response from the server.
      */
+    @Override
     public Socks5BytestreamSession establishSession(Jid targetJID) throws XMPPException,
                     IOException, InterruptedException, SmackException {
         String sessionID = getNextSessionID();
@@ -405,6 +413,7 @@ public final class Socks5BytestreamManager extends Manager implements Bytestream
      * @throws SmackException if the target does not support SOCKS5.
      * @throws XMPPException 
      */
+    @Override
     public Socks5BytestreamSession establishSession(Jid targetJID, String sessionID)
                     throws IOException, InterruptedException, NoResponseException, SmackException, XMPPException{
         XMPPConnection connection = connection();

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/socks5/Socks5BytestreamRequest.java

@@ -170,6 +170,7 @@ public class Socks5BytestreamRequest implements BytestreamRequest {
      * 
      * @return the sender of the SOCKS5 Bytestream initialization request.
      */
+    @Override
     public Jid getFrom() {
         return this.bytestreamRequest.getFrom();
     }
@@ -179,6 +180,7 @@ public class Socks5BytestreamRequest implements BytestreamRequest {
      * 
      * @return the session ID of the SOCKS5 Bytestream initialization request.
      */
+    @Override
     public String getSessionID() {
         return this.bytestreamRequest.getSessionID();
     }
@@ -195,6 +197,7 @@ public class Socks5BytestreamRequest implements BytestreamRequest {
      * @throws XMPPErrorException 
      * @throws SmackException 
      */
+    @Override
     public Socks5BytestreamSession accept() throws InterruptedException, XMPPErrorException, SmackException {
         Collection<StreamHost> streamHosts = this.bytestreamRequest.getStreamHosts();
 
@@ -264,6 +267,7 @@ public class Socks5BytestreamRequest implements BytestreamRequest {
      * @throws NotConnectedException 
      * @throws InterruptedException 
      */
+    @Override
     public void reject() throws NotConnectedException, InterruptedException {
         this.manager.replyRejectPacket(this.bytestreamRequest);
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/socks5/Socks5BytestreamSession.java

@@ -64,14 +64,17 @@ public class Socks5BytestreamSession implements BytestreamSession {
         return !this.isDirect;
     }
 
+    @Override
     public InputStream getInputStream() throws IOException {
         return this.socket.getInputStream();
     }
 
+    @Override
     public OutputStream getOutputStream() throws IOException {
         return this.socket.getOutputStream();
     }
 
+    @Override
     public int getReadTimeout() throws IOException {
         try {
             return this.socket.getSoTimeout();
@@ -81,6 +84,7 @@ public class Socks5BytestreamSession implements BytestreamSession {
         }
     }
 
+    @Override
     public void setReadTimeout(int timeout) throws IOException {
         try {
             this.socket.setSoTimeout(timeout);
@@ -90,6 +94,7 @@ public class Socks5BytestreamSession implements BytestreamSession {
         }
     }
 
+    @Override
     public void close() throws IOException {
         this.socket.close();
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/socks5/Socks5Client.java

@@ -19,6 +19,7 @@ package org.jivesoftware.smackx.bytestreams.socks5;
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
+import java.io.UnsupportedEncodingException;
 import java.net.InetSocketAddress;
 import java.net.Socket;
 import java.net.SocketAddress;
@@ -34,6 +35,7 @@ import java.util.logging.Logger;
 import org.jivesoftware.smack.SmackException;
 import org.jivesoftware.smack.XMPPException;
 import org.jivesoftware.smack.XMPPException.XMPPErrorException;
+import org.jivesoftware.smack.util.StringUtils;
 import org.jivesoftware.smackx.bytestreams.socks5.packet.Bytestream.StreamHost;
 
 /**
@@ -82,6 +84,7 @@ class Socks5Client {
         // wrap connecting in future for timeout
         FutureTask<Socket> futureTask = new FutureTask<Socket>(new Callable<Socket>() {
 
+            @Override
             public Socket call() throws IOException, SmackException {
 
                 // initialize socket
@@ -199,7 +202,13 @@ class Socks5Client {
      * @return SOCKS5 connection request message
      */
     private byte[] createSocks5ConnectRequest() {
-        byte[] addr = this.digest.getBytes();
+        byte[] addr;
+        try {
+            addr = digest.getBytes(StringUtils.UTF8);
+        }
+        catch (UnsupportedEncodingException e) {
+            throw new AssertionError(e);
+        }
 
         byte[] data = new byte[7 + addr.length];
         data[0] = (byte) 0x05; // version (SOCKS5)

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/socks5/Socks5ClientForInitiator.java

@@ -69,6 +69,7 @@ class Socks5ClientForInitiator extends Socks5Client {
         this.target = target;
     }
 
+    @Override
     public Socket getSocket(int timeout) throws IOException, InterruptedException,
                     TimeoutException, XMPPException, SmackException {
         Socket socket = null;

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/socks5/Socks5Proxy.java

@@ -38,6 +38,7 @@ import java.util.logging.Level;
 import java.util.logging.Logger;
 
 import org.jivesoftware.smack.SmackException;
+import org.jivesoftware.smack.util.StringUtils;
 
 /**
  * The Socks5Proxy class represents a local SOCKS5 proxy server. It can be enabled/disabled by
@@ -381,6 +382,7 @@ public final class Socks5Proxy {
      */
     private class Socks5ServerProcess implements Runnable {
 
+        @Override
         public void run() {
             while (true) {
                 Socket socket = null;
@@ -470,7 +472,7 @@ public final class Socks5Proxy {
             byte[] connectionRequest = Socks5Utils.receiveSocks5Message(in);
 
             // extract digest
-            String responseDigest = new String(connectionRequest, 5, connectionRequest[4]);
+            String responseDigest = new String(connectionRequest, 5, connectionRequest[4], StringUtils.UTF8);
 
             // return error if digest is not allowed
             if (!Socks5Proxy.this.allowedConnections.contains(responseDigest)) {

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/socks5/packet/Bytestream.java

@@ -317,6 +317,7 @@ public class Bytestream extends IQ {
             return port;
         }
 
+        @Override
         public String getElementName() {
             return ELEMENTNAME;
         }
@@ -366,6 +367,7 @@ public class Bytestream extends IQ {
             return JID;
         }
 
+        @Override
         public String getElementName() {
             return ELEMENTNAME;
         }
@@ -408,6 +410,7 @@ public class Bytestream extends IQ {
             return target;
         }
 
+        @Override
         public String getElementName() {
             return ELEMENTNAME;
         }

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

@@ -65,6 +65,7 @@ import java.util.WeakHashMap;
 import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.logging.Level;
 import java.util.logging.Logger;
+import java.io.UnsupportedEncodingException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 
@@ -113,6 +114,7 @@ public final class EntityCapsManager extends Manager {
 
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(XMPPConnection connection) {
                 getInstanceFor(connection);
             }
@@ -346,6 +348,7 @@ public final class EntityCapsManager extends Manager {
         // XEP-0115 specifies that a client SHOULD include entity capabilities
         // with every presence notification it sends.
         StanzaListener packetInterceptor = new StanzaListener() {
+            @Override
             public void processStanza(Stanza packet) {
                 if (!entityCapsEnabled) {
                     // Be sure to not send stanzas with the caps extension if it's not enabled
@@ -403,7 +406,11 @@ public final class EntityCapsManager extends Manager {
      * @param user
      *            the user (Full JID)
      */
+    // TODO: Change parameter type to Jid in Smack 4.3.
+    @SuppressWarnings("CollectionIncompatibleType")
     public static void removeUserCapsNode(String user) {
+        // While JID_TO_NODEVER_CHACHE has the generic types <Jid, NodeVerHash>, it is ok to call remove with String
+        // arguments, since the same Jid and String representations would be equal and have the same hash code.
         JID_TO_NODEVER_CACHE.remove(user);
     }
 
@@ -658,6 +665,7 @@ public final class EntityCapsManager extends Manager {
                 // XEP-0128 data forms, sort the forms by the FORM_TYPE (i.e.,
                 // by the XML character data of the <value/> element).
                 SortedSet<FormField> fs = new TreeSet<FormField>(new Comparator<FormField>() {
+                    @Override
                     public int compare(FormField f1, FormField f2) {
                         return f1.getVariable().compareTo(f2.getVariable());
                     }
@@ -701,9 +709,16 @@ public final class EntityCapsManager extends Manager {
         // encoded using Base64 as specified in Section 4 of RFC 4648
         // (note: the Base64 output MUST NOT include whitespace and MUST set
         // padding bits to zero).
+        byte[] bytes;
+        try {
+            bytes = sb.toString().getBytes(StringUtils.UTF8);
+        }
+        catch (UnsupportedEncodingException e) {
+            throw new AssertionError(e);
+        }
         byte[] digest;
         synchronized(md) {
-            digest = md.digest(sb.toString().getBytes());
+            digest = md.digest(bytes);
         }
         String version = Base64.encodeToString(digest);
         return new CapsVersionAndHash(version, hash);

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

@@ -35,10 +35,12 @@ public class CapsExtension implements ExtensionElement {
         this.hash = hash;
     }
 
+    @Override
     public String getElementName() {
         return ELEMENT;
     }
 
+    @Override
     public String getNamespace() {
         return NAMESPACE;
     }

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

@@ -27,6 +27,7 @@ import org.xmlpull.v1.XmlPullParserException;
 
 public class CapsExtensionProvider extends ExtensionElementProvider<CapsExtension> {
 
+    @Override
     public CapsExtension parse(XmlPullParser parser, int initialDepth) throws XmlPullParserException, IOException,
             SmackException {
         String hash = null;

smack-extensions/src/main/java/org/jivesoftware/smackx/chatstates/ChatStateManager.java

@@ -119,6 +119,7 @@ public final class ChatStateManager extends Manager {
     }
 
 
+    @Override
     public boolean equals(Object o) {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
@@ -129,6 +130,7 @@ public final class ChatStateManager extends Manager {
 
     }
 
+    @Override
     public int hashCode() {
         return connection().hashCode();
     }
@@ -164,12 +166,14 @@ public final class ChatStateManager extends Manager {
         }
     }
 
-    private class IncomingMessageInterceptor implements ChatManagerListener, ChatMessageListener {
+    private static class IncomingMessageInterceptor implements ChatManagerListener, ChatMessageListener {
 
+        @Override
         public void chatCreated(final org.jivesoftware.smack.chat.Chat chat, boolean createdLocally) {
             chat.addMessageListener(this);
         }
 
+        @Override
         public void processMessage(org.jivesoftware.smack.chat.Chat chat, Message message) {
             ExtensionElement extension = message.getExtension(NAMESPACE);
             if (extension == null) {

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

@@ -457,12 +457,13 @@ public abstract class AdHocCommand {
          */
         sessionExpired("session-expired");
 
-        private String value;
+        private final String value;
 
         SpecificErrorCondition(String value) {
             this.value = value;
         }
 
+        @Override
         public String toString() {
             return value;
         }

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

@@ -17,6 +17,7 @@
 
 package org.jivesoftware.smackx.commands;
 
+import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
@@ -83,6 +84,7 @@ public final class AdHocCommandManager extends Manager {
      */
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(XMPPConnection connection) {
                 getAddHocCommandsManager(connection);
             }
@@ -200,8 +202,16 @@ public final class AdHocCommandManager extends Manager {
      */
     public void registerCommand(String node, String name, final Class<? extends LocalCommand> clazz) {
         registerCommand(node, name, new LocalCommandFactory() {
+            @Override
             public LocalCommand getInstance() throws InstantiationException, IllegalAccessException  {
-                return clazz.newInstance();
+                try {
+                    return clazz.getConstructor().newInstance();
+                }
+                catch (IllegalArgumentException | InvocationTargetException | NoSuchMethodException
+                                | SecurityException e) {
+                    // TODO: Throw those method in Smack 4.3.
+                    throw new IllegalStateException(e);
+                }
             }
         });
     }
@@ -393,6 +403,7 @@ public final class AdHocCommandManager extends Manager {
                     // See if the session reaping thread is started. If not, start it.
                     if (sessionsSweeper == null) {
                         sessionsSweeper = new Thread(new Runnable() {
+                            @Override
                             public void run() {
                                 while (true) {
                                     for (String sessionId : executingCommands.keySet()) {

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

@@ -248,9 +248,11 @@ public class AdHocCommandData extends IQ {
             this.condition = condition;
         }
 
+        @Override
         public String getElementName() {
             return condition.toString();
         }
+        @Override
         public String getNamespace() {
             return namespace;
         }
@@ -259,6 +261,7 @@ public class AdHocCommandData extends IQ {
             return condition;
         }
 
+        @Override
         public String toXML() {
             StringBuilder buf = new StringBuilder();
             buf.append('<').append(getElementName());

smack-extensions/src/main/java/org/jivesoftware/smackx/delay/packet/DelayInformation.java

@@ -88,10 +88,12 @@ public class DelayInformation implements ExtensionElement {
         return reason;
     }
 
+    @Override
     public String getElementName() {
         return ELEMENT;
     }
 
+    @Override
     public String getNamespace() {
         return NAMESPACE;
     }

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

@@ -25,18 +25,22 @@ import java.util.List;
 
 public abstract class AbstractNodeInformationProvider implements NodeInformationProvider {
 
+    @Override
     public List<DiscoverItems.Item> getNodeItems() {
         return null;
     }
 
+    @Override
     public List<String> getNodeFeatures() {
         return null;
     }
 
+    @Override
     public List<DiscoverInfo.Identity> getNodeIdentities() {
         return null;
     }
 
+    @Override
     public List<ExtensionElement> getNodePacketExtensions() {
         return null;
     }

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

@@ -91,6 +91,7 @@ public final class ServiceDiscoveryManager extends Manager {
     // Create a new ServiceDiscoveryManager on every established connection
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(XMPPConnection connection) {
                 getInstanceFor(connection);
             }

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

@@ -394,6 +394,7 @@ public class DiscoverInfo extends IQ implements TypedCloneable<DiscoverInfo> {
          * <a href="http://xmpp.org/extensions/xep-0115.html#ver-proc">XEP-0015 5.4 Processing Method (Step 3.3)</a>.
          *  
          */
+        @Override
         public boolean equals(Object obj) {
             if (obj == null)
                 return false;
@@ -437,6 +438,7 @@ public class DiscoverInfo extends IQ implements TypedCloneable<DiscoverInfo> {
          * @return a negative integer, zero, or a positive integer as this object is less than,
          *         equal to, or greater than the specified object.
          */
+        @Override
         public int compareTo(DiscoverInfo.Identity other) {
             String otherLang = other.lang == null ? "" : other.lang;
             String thisLang = lang == null ? "" : lang;
@@ -512,6 +514,7 @@ public class DiscoverInfo extends IQ implements TypedCloneable<DiscoverInfo> {
             return xml;
         }
 
+        @Override
         public boolean equals(Object obj) {
             if (obj == null)
                 return false;

smack-extensions/src/main/java/org/jivesoftware/smackx/filetransfer/FaultTolerantNegotiator.java

@@ -55,11 +55,13 @@ public class FaultTolerantNegotiator extends StreamNegotiator {
         secondaryNegotiator.newStreamInitiation(from, streamID);
     }
 
+    @Override
     InputStream negotiateIncomingStream(Stanza streamInitiation) {
         throw new UnsupportedOperationException("Negotiation only handled by create incoming " +
                 "stream method.");
     }
 
+    @Override
     public InputStream createIncomingStream(final StreamInitiation initiation) throws SmackException, XMPPErrorException, InterruptedException {
         // This could be either an xep47 ibb 'open' iq or an xep65 streamhost iq
         IQ initationSet = initiateIncomingStream(connection, initiation);
@@ -79,6 +81,7 @@ public class FaultTolerantNegotiator extends StreamNegotiator {
         }
     }
 
+    @Override
     public OutputStream createOutgoingStream(String streamID, Jid initiator, Jid target)
                     throws SmackException, XMPPException, InterruptedException {
         OutputStream stream;
@@ -92,6 +95,7 @@ public class FaultTolerantNegotiator extends StreamNegotiator {
         return stream;
     }
 
+    @Override
     public String[] getNamespaces() {
         String[] primary = primaryNegotiator.getNamespaces();
         String[] secondary = secondaryNegotiator.getNamespaces();

smack-extensions/src/main/java/org/jivesoftware/smackx/filetransfer/FileTransfer.java

@@ -292,12 +292,13 @@ public abstract class FileTransfer {
          */
         cancelled("Cancelled");
 
-        private String status;
+        private final String status;
 
         private Status(String status) {
             this.status = status;
         }
 
+        @Override
         public String toString() {
             return status;
         }
@@ -358,6 +359,7 @@ public abstract class FileTransfer {
             return msg;
         }
 
+        @Override
         public String toString() {
             return msg;
         }

smack-extensions/src/main/java/org/jivesoftware/smackx/filetransfer/IBBTransferNegotiator.java

@@ -58,6 +58,7 @@ public class IBBTransferNegotiator extends StreamNegotiator {
         this.manager = InBandBytestreamManager.getByteStreamManager(connection);
     }
 
+    @Override
     public OutputStream createOutgoingStream(String streamID, Jid initiator,
                     Jid target) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
         InBandBytestreamSession session = this.manager.establishSession(target, streamID);
@@ -65,6 +66,7 @@ public class IBBTransferNegotiator extends StreamNegotiator {
         return session.getOutputStream();
     }
 
+    @Override
     public InputStream createIncomingStream(StreamInitiation initiation)
                     throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
         /*
@@ -87,10 +89,12 @@ public class IBBTransferNegotiator extends StreamNegotiator {
         this.manager.ignoreBytestreamRequestOnce(streamID);
     }
 
+    @Override
     public String[] getNamespaces() {
         return new String[] { DataPacketExtension.NAMESPACE };
     }
 
+    @Override
     InputStream negotiateIncomingStream(Stanza streamInitiation) throws NotConnectedException, InterruptedException {
         // build In-Band Bytestream request
         InBandBytestreamRequest request = new ByteStreamRequest(this.manager,

smack-extensions/src/main/java/org/jivesoftware/smackx/filetransfer/IncomingFileTransfer.java

@@ -126,6 +126,7 @@ public class IncomingFileTransfer extends FileTransfer {
         }
 
         Thread transferThread = new Thread(new Runnable() {
+            @Override
             public void run() {
                 try {
                     inputStream = negotiateStream();
@@ -184,6 +185,7 @@ public class IncomingFileTransfer extends FileTransfer {
         FutureTask<InputStream> streamNegotiatorTask = new FutureTask<InputStream>(
                 new Callable<InputStream>() {
 
+                    @Override
                     public InputStream call() throws Exception {
                         return streamNegotiator
                                 .createIncomingStream(recieveRequest.getStreamInitiation());
@@ -220,6 +222,7 @@ public class IncomingFileTransfer extends FileTransfer {
         return inputStream;
     }
 
+    @Override
     public void cancel() {
         setStatus(Status.cancelled);
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/filetransfer/OutgoingFileTransfer.java

@@ -174,6 +174,7 @@ public class OutgoingFileTransfer extends FileTransfer {
         setFileInfo(fileName, fileSize);
         this.callback = progress;
         transferThread = new Thread(new Runnable() {
+            @Override
             public void run() {
                 try {
                     OutgoingFileTransfer.this.outputStream = negotiateStream(
@@ -192,7 +193,7 @@ public class OutgoingFileTransfer extends FileTransfer {
     }
 
     private void checkTransferThread() {
-        if (transferThread != null && transferThread.isAlive() || isDone()) {
+        if ((transferThread != null && transferThread.isAlive()) || isDone()) {
             throw new IllegalStateException(
                     "File transfer in progress or has already completed.");
         }
@@ -225,6 +226,7 @@ public class OutgoingFileTransfer extends FileTransfer {
         }
 
         transferThread = new Thread(new Runnable() {
+            @Override
             public void run() {
                 try {
                     outputStream = negotiateStream(file.getName(), file
@@ -298,6 +300,7 @@ public class OutgoingFileTransfer extends FileTransfer {
 
         setFileInfo(fileName, fileSize);
         transferThread = new Thread(new Runnable() {
+            @Override
             public void run() {
                 //Create packet filter
                 try {
@@ -398,6 +401,7 @@ public class OutgoingFileTransfer extends FileTransfer {
         return outputStream;
     }
 
+    @Override
     public void cancel() {
         setStatus(Status.cancelled);
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/geoloc/GeoLocationManager.java

@@ -34,6 +34,7 @@ public final class GeoLocationManager extends Manager {
 
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(XMPPConnection connection) {
                 getInstanceFor(connection);
             }

smack-extensions/src/main/java/org/jivesoftware/smackx/iqlast/LastActivityManager.java

@@ -108,6 +108,7 @@ public final class LastActivityManager extends Manager {
     // Enable the LastActivity support on every established connection
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(XMPPConnection connection) {
                 LastActivityManager.getInstanceFor(connection);
             }
@@ -135,6 +136,7 @@ public final class LastActivityManager extends Manager {
 
         // Listen to all the sent messages to reset the idle time on each one
         connection.addPacketSendingListener(new StanzaListener() {
+            @Override
             public void processStanza(Stanza packet) {
                 Presence presence = (Presence) packet;
                 Presence.Mode mode = presence.getMode();

smack-extensions/src/main/java/org/jivesoftware/smackx/iqprivate/packet/DefaultPrivateData.java

@@ -66,6 +66,7 @@ public class DefaultPrivateData implements PrivateData {
      *
      * @return the XML element name of the stanza(/packet) extension.
      */
+    @Override
     public String getElementName() {
         return elementName;
     }
@@ -75,10 +76,12 @@ public class DefaultPrivateData implements PrivateData {
      *
      * @return the XML namespace of the stanza(/packet) extension.
      */
+    @Override
     public String getNamespace() {
         return namespace;
     }
 
+    @Override
     public String toXML() {
         StringBuilder buf = new StringBuilder();
         buf.append('<').append(elementName).append(" xmlns=\"").append(namespace).append("\">");

smack-extensions/src/main/java/org/jivesoftware/smackx/iqversion/VersionManager.java

@@ -71,6 +71,7 @@ public final class VersionManager extends Manager {
 
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(XMPPConnection connection) {
                 VersionManager.getInstanceFor(connection);
             }

smack-extensions/src/main/java/org/jivesoftware/smackx/muc/DefaultParticipantStatusListener.java

@@ -32,48 +32,63 @@ import org.jxmpp.jid.parts.Resourcepart;
  */
 public class DefaultParticipantStatusListener implements ParticipantStatusListener {
 
+    @Override
     public void joined(EntityFullJid participant) {
     }
 
+    @Override
     public void left(EntityFullJid participant) {
     }
 
+    @Override
     public void kicked(EntityFullJid participant, Jid actor, String reason) {
     }
 
+    @Override
     public void voiceGranted(EntityFullJid participant) {
     }
 
+    @Override
     public void voiceRevoked(EntityFullJid participant) {
     }
 
+    @Override
     public void banned(EntityFullJid participant, Jid actor, String reason) {
     }
 
+    @Override
     public void membershipGranted(EntityFullJid participant) {
     }
 
+    @Override
     public void membershipRevoked(EntityFullJid participant) {
     }
 
+    @Override
     public void moderatorGranted(EntityFullJid participant) {
     }
 
+    @Override
     public void moderatorRevoked(EntityFullJid participant) {
     }
 
+    @Override
     public void ownershipGranted(EntityFullJid participant) {
     }
 
+    @Override
     public void ownershipRevoked(EntityFullJid participant) {
     }
 
+    @Override
     public void adminGranted(EntityFullJid participant) {
     }
 
+    @Override
     public void adminRevoked(EntityFullJid participant) {
     }
 
+    @Override
     public void nicknameChanged(EntityFullJid participant, Resourcepart newNickname) {
     }
 

smack-extensions/src/main/java/org/jivesoftware/smackx/muc/DefaultUserStatusListener.java

@@ -30,42 +30,55 @@ import org.jxmpp.jid.Jid;
  */
 public class DefaultUserStatusListener implements UserStatusListener {
 
+    @Override
     public void kicked(Jid actor, String reason) {
     }
 
+    @Override
     public void voiceGranted() {
     }
 
+    @Override
     public void voiceRevoked() {
     }
 
+    @Override
     public void banned(Jid actor, String reason) {
     }
 
+    @Override
     public void membershipGranted() {
     }
 
+    @Override
     public void membershipRevoked() {
     }
 
+    @Override
     public void moderatorGranted() {
     }
 
+    @Override
     public void moderatorRevoked() {
     }
 
+    @Override
     public void ownershipGranted() {
     }
 
+    @Override
     public void ownershipRevoked() {
     }
 
+    @Override
     public void adminGranted() {
     }
 
+    @Override
     public void adminRevoked() {
     }
 
+    @Override
     public void roomDestroyed(MultiUserChat alternateMUC, String reason) {
     }
 

smack-extensions/src/main/java/org/jivesoftware/smackx/muc/MultiUserChat.java

@@ -163,6 +163,7 @@ public class MultiUserChat {
 
         // Create a listener for subject updates.
         subjectListener = new StanzaListener() {
+            @Override
             public void processStanza(Stanza packet) {
                 Message msg = (Message) packet;
                 EntityFullJid from = msg.getFrom().asEntityFullJidIfPossible();
@@ -181,6 +182,7 @@ public class MultiUserChat {
 
         // Create a listener for all presence updates.
         presenceListener = new StanzaListener() {
+            @Override
             public void processStanza(Stanza packet) {
                 Presence presence = (Presence) packet;
                 final EntityFullJid from = presence.getFrom().asEntityFullJidIfPossible();
@@ -251,6 +253,7 @@ public class MultiUserChat {
         // Listens for all messages that include a MUCUser extension and fire the invitation
         // rejection listeners if the message includes an invitation rejection.
         declinesListener = new StanzaListener() {
+            @Override
             public void processStanza(Stanza packet) {
                 Message message = (Message) packet;
                 // Get the MUC User extension

smack-extensions/src/main/java/org/jivesoftware/smackx/muc/MultiUserChatManager.java

@@ -82,6 +82,7 @@ public final class MultiUserChatManager extends Manager {
 
     static {
         XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
             public void connectionCreated(final XMPPConnection connection) {
                 // Set on every established connection that this client supports the Multi-User
                 // Chat protocol. This information will be used when another client tries to
@@ -149,6 +150,7 @@ public final class MultiUserChatManager extends Manager {
         // Listens for all messages that include a MUCUser extension and fire the invitation
         // listeners if the message includes an invitation.
         StanzaListener invitationPacketListener = new StanzaListener() {
+            @Override
             public void processStanza(Stanza packet) {
                 final Message message = (Message) packet;
                 // Get the MUCUser extension

smack-extensions/src/main/java/org/jivesoftware/smackx/muc/Occupant.java

@@ -110,6 +110,7 @@ public class Occupant {
         return nick;
     }
 
+    @Override
     public boolean equals(Object obj) {
         if(!(obj instanceof Occupant)) {
             return false;
@@ -118,6 +119,7 @@ public class Occupant {
         return jid.equals(occupant.jid);
     }
 
+    @Override
     public int hashCode() {
         int result;
         result = affiliation.hashCode();

smack-extensions/src/main/java/org/jivesoftware/smackx/muc/packet/GroupChatInvitation.java

@@ -92,10 +92,12 @@ public class GroupChatInvitation implements ExtensionElement {
         return roomAddress;
     }
 
+    @Override
     public String getElementName() {
         return ELEMENT;
     }
 
+    @Override
     public String getNamespace() {
         return NAMESPACE;
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/muc/packet/MUCInitialPresence.java

@@ -72,10 +72,12 @@ public class MUCInitialPresence implements ExtensionElement {
         }
     }
 
+    @Override
     public String getElementName() {
         return ELEMENT;
     }
 
+    @Override
     public String getNamespace() {
         return NAMESPACE;
     }
@@ -282,6 +284,7 @@ public class MUCInitialPresence implements ExtensionElement {
             this.since = since;
         }
 
+        @Override
         public XmlStringBuilder toXML() {
             XmlStringBuilder xml = new XmlStringBuilder(this);
             xml.optIntAttribute("maxchars", getMaxChars());

smack-extensions/src/main/java/org/jivesoftware/smackx/muc/packet/MUCItem.java

@@ -158,6 +158,7 @@ public class MUCItem implements NamedElement {
         return role;
     }
 
+    @Override
     public XmlStringBuilder toXML() {
         XmlStringBuilder xml = new XmlStringBuilder(this);
         xml.optAttribute("affiliation", getAffiliation());

smack-extensions/src/main/java/org/jivesoftware/smackx/muc/packet/MUCUser.java

@@ -50,10 +50,12 @@ public class MUCUser implements ExtensionElement {
     private String password;
     private Destroy destroy;
 
+    @Override
     public String getElementName() {
         return ELEMENT;
     }
 
+    @Override
     public String getNamespace() {
         return NAMESPACE;
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/nick/packet/Nick.java

@@ -65,6 +65,7 @@ public class Nick implements ExtensionElement {
      * 
      * @see org.jivesoftware.smack.packet.PacketExtension#getElementName()
      */
+    @Override
     public String getElementName() {
         return ELEMENT_NAME;
     }
@@ -74,6 +75,7 @@ public class Nick implements ExtensionElement {
      * 
      * @see org.jivesoftware.smack.packet.PacketExtension#getNamespace()
      */
+    @Override
     public String getNamespace() {
         return NAMESPACE;
     }
@@ -83,6 +85,7 @@ public class Nick implements ExtensionElement {
      * 
      * @see org.jivesoftware.smack.packet.PacketExtension#toXML()
      */
+    @Override
     public String toXML() {
         final StringBuilder buf = new StringBuilder();