AlreadyConnectedException when using netty for client connection

[Y. J. Chun]

Hello.

I'm using netty to connect to remote server. The connection is
established successfully. But handleUpstream() receives ExceptionEvent
which is java.nio.channels.AlreadyConnectedException. Not sure if
affects the channel in one way or another because connection seems to
be processed without problem. Please tell me if this is normal or
something is wrong.

Exception message is following.
java.nio.channels.AlreadyConnectedException: null
	at sun.nio.ch.SocketChannelImpl.ensureOpenAndUnconnected(SocketChannelImpl.java:474)
[na:1.6.0_16]
	at sun.nio.ch.SocketChannelImpl.bind(SocketChannelImpl.java:446) [na:1.6.0_16]
	at sun.nio.ch.SocketAdaptor.bind(SocketAdaptor.java:132) [na:1.6.0_16]
	at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink.bind(NioClientSocketPipelineSink.java:131)
[netty-3.1.0.GA.jar:na]
	at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink.eventSunk(NioClientSocketPipelineSink.java:102)
[netty-3.1.0.GA.jar:na]
	at <DELETING:My class name> [classes/:na]
	at org.jboss.netty.channel.Channels.fireChannelBound(Channels.java:239)
[netty-3.1.0.GA.jar:na]
	at org.jboss.netty.channel.socket.nio.NioWorker$RegisterTask.run(NioWorker.java:760)
[netty-3.1.0.GA.jar:na]
	at org.jboss.netty.channel.socket.nio.NioWorker.processRegisterTaskQueue(NioWorker.java:260)
[netty-3.1.0.GA.jar:na]
	at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:199)
[netty-3.1.0.GA.jar:na]
	at org.jboss.netty.util.internal.IoWorkerRunnable.run(IoWorkerRunnable.java:53)
[netty-3.1.0.GA.jar:na]
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
[na:1.6.0_16]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
[na:1.6.0_16]
	at java.lang.Thread.run(Thread.java:619) [na:1.6.0_16]

channel was created by following bootstrap
		bootstrap = new ClientBootstrap(
				new NioClientSocketChannelFactory(Executors	.newCachedThreadPool()
						, Executors.newCachedThreadPool()));
	
		bootstrap.getPipeline().addLast("handler", this);


Thanks.