@Stateless
@ServerEndpoint(value = "/chat/{room}", decoders = { MessageDecoder.class }, encoders = { MessageEncoder.class }, configurator = ServletAwareConfig.class)
public class ChatEndpoint {

	private static final Logger log = Logger.getLogger(ChatEndpoint.class
			.getName());

	@OnOpen
	public void open(Session session, EndpointConfig config,
			@PathParam("room") String room) {
		log.info("Client joined: " + session);		
	}

	@OnClose
	public void close(Session session, CloseReason closeReason) {
		log.info("Client left: " + session);
	}

	@OnMessage
	public void onMessage(AbstractMessage abstractMessage, Session session) {

	}

	@OnError
	public void error(Session session, Throwable t) {
		log.log(Level.WARNING, "General error. " + session, t);
	}
}

16:02:53,853 WARNING [de.apaxo.chat.ChatEndpoint] (default task-17) General error. io.undertow.websockets.jsr.UndertowSession@2c302c48: java.nio.channels.ClosedChannelException
	at io.undertow.server.protocol.framed.AbstractFramedChannel.receive(AbstractFramedChannel.java:260) [undertow-core-1.0.15.Final.jar:1.0.15.Final]
	at io.undertow.websockets.core.AbstractReceiveListener.handleEvent(AbstractReceiveListener.java:20) [undertow-core-1.0.15.Final.jar:1.0.15.Final]
	at io.undertow.websockets.core.AbstractReceiveListener.handleEvent(AbstractReceiveListener.java:15) [undertow-core-1.0.15.Final.jar:1.0.15.Final]
	at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
	at io.undertow.server.protocol.framed.AbstractFramedChannel$FrameReadListener.handleEvent(AbstractFramedChannel.java:632) [undertow-core-1.0.15.Final.jar:1.0.15.Final]
	at io.undertow.server.protocol.framed.AbstractFramedChannel$FrameReadListener.handleEvent(AbstractFramedChannel.java:618) [undertow-core-1.0.15.Final.jar:1.0.15.Final]
	at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
	at org.xnio.conduits.ReadReadyHandler$ChannelListenerHandler.readReady(ReadReadyHandler.java:66)
	at org.xnio.nio.NioSocketConduit.handleReady(NioSocketConduit.java:87)
	at org.xnio.nio.WorkerThread.run(WorkerThread.java:539)