java.nio.channels.CancelledKeyException
   at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:55)
   at sun.nio.ch.SelectionKeyImpl.interestOps(SelectionKeyImpl.java:64)
   at org.netbeans.modules.web.common.websocket.SocketServer.run(SocketServer.java:92)
   at java.lang.Thread.run(Thread.java:680)