xsocket的提前关闭异常

google到的资源好少，基本都是xsocket自己的文档，难道没什么人在用吗？

这个错误

java.nio.channels.ClosedChannelException
        at org.xsocket.connection.AbstractNonBlockingStream.ensureStreamIsOpenAndWritable(AbstractNonBlockingStream.java:1420)
        at org.xsocket.connection.AbstractNonBlockingStream.write(AbstractNonBlockingStream.java:1135)
       ...

        at org.xsocket.connection.HandlerAdapter.onData(HandlerAdapter.java:132)
        at org.xsocket.connection.MultithreadedHandlerAdapter.access$2(MultithreadedHandlerAdapter.java:1)
        at org.xsocket.connection.MultithreadedHandlerAdapter$2.run(MultithreadedHandlerAdapter.java:80)
        at org.xsocket.SerializedTaskQueue.performPendingTasks(SerializedTaskQueue.java:121)
        at org.xsocket.SerializedTaskQueue.access$0(SerializedTaskQueue.java:105)
        at org.xsocket.SerializedTaskQueue$MultithreadedTaskProcessor.run(SerializedTaskQueue.java:147)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
        at java.lang.Thread.run(Thread.java:619)


貌似是返回时检查socket是否打开并且可写时出错，应该是socket被关闭。

但是关闭的原因是什么？超时？我设置了很长的idletimeout，connectiontimeout是系统默认，应该更长。还是其他地方使用不当？