Netty: ClosedChannelException when closing channel

Question

Why when i'm trying to close channel, I got ChannelClosedException thrown? Closing with Channel.close(), exception's stacktrace:

java.nio.channels.ClosedChannelException
    at org.jboss.netty.channel.socket.nio.NioWorker.cleanUpWriteBuffer(NioWorker.java:645)
    at org.jboss.netty.channel.socket.nio.NioWorker.close(NioWorker.java:601)
    at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.handleAcceptedSocket(NioServerSocketPipelineSink.java:119)
    at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.eventSunk(NioServerSocketPipelineSink.java:76)
    at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:60)
    at org.jboss.netty.channel.Channels.close(Channels.java:720)
    at org.jboss.netty.channel.AbstractChannel.close(AbstractChannel.java:200)
    at ru.greencubes.player.PlayerWorkerThread.closeConnection(PlayerWorkerThread.java:107)
    at ru.greencubes.player.PlayerWorkerThread.shutDown(PlayerWorkerThread.java:282)
    at ru.greencubes.player.NetworkPlayerThread.disconnect(NetworkPlayerThread.java:1289)
    at ru.greencubes.player.NetworkPlayerThread.disconnect(NetworkPlayerThread.java:1272)
    at ru.greencubes.server.Server.run(Server.java:1590)
    at ru.greencubes.server.ServerThread.run(ServerThread.java:12)

Answer 1

I think you should just ignore this. It just told you that the channel was already closed when it tried to write the remaining bytes to the channel. So nothing to worry about.