NullPointerException in WsCloseFilter$1.operationComplete

[cmebarrow]

The following extract from the log files for support ticket 3240 shows a NullPointerException in WsCloseFilter occurring immediately after writing a WS_CLOSE frame in response to a received one. This was using Enterprise Gateway release 5.0.2-RC003 (which uses Gateway version 5.1.1).

2016-08-19 15:24:58,640 transport.tcp.accept [New I/O worker #3] INFO  [tcp#119775 126.246.166.113:61228] CLOSED: (#00119775: kaazing niosocketchannel, server, /126.246.166.113:61228 => /126.246.166.103:1080)
2016-08-19 15:24:58,639 org.apache.mina.util.DefaultExceptionMonitor [New I/O worker #1] WARN  Unexpected exception.
java.lang.NullPointerException
    at org.kaazing.gateway.transport.wsn.WsCloseFilter$1.operationComplete(WsCloseFilter.java:187)
    at org.kaazing.gateway.transport.wsn.WsCloseFilter$1.operationComplete(WsCloseFilter.java:169)
    at org.kaazing.mina.core.future.DefaultIoFutureEx.notifyListener(DefaultIoFutureEx.java:423)
    at org.kaazing.mina.core.future.DefaultIoFutureEx.notifyListeners(DefaultIoFutureEx.java:411)
    at org.kaazing.mina.core.future.DefaultIoFutureEx.setValue(DefaultIoFutureEx.java:327)
    at org.kaazing.mina.core.future.DefaultWriteFutureEx.setWritten(DefaultWriteFutureEx.java:89)
    at org.kaazing.mina.netty.ChannelWriteFutureListener.setFutureWritten(ChannelWriteFutureListener.java:51)
    at org.kaazing.mina.netty.ChannelWriteFutureListener.operationComplete(ChannelWriteFutureListener.java:41)
...
    at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:143)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:144)
    at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:348)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:120)
    at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:243)
    at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
    at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

The NPE happens because WsnSession wsnSession = SESSION_KEY.get(session) returns null. The relevant code from Gateway 5.1.1 is WsCloseFilter.java.
Here is one of the gateway log files containing this exception:

error.log.txt

[cmebarrow]

Related bug: #685

[cmebarrow]

The error.log file in 112_ES.zip from support ticket 4404 contains the same exception stack, showing this bug is also present in 5.1.4-RC005. Here's a copy:

error.log.txt

[sbadugu]

@cmebarrow Does the related bug #685 fix this issue too ? I am just confirming so that someone doesn't spend time on this issue, if it is already fixed.

[cmebarrow]

@sbadugu No, #685 does not fix this issue.

[StCostea]

I am not able to reproduce this exception. I have tried to kill the client process or to disable the network interface. Currently I'm trying to throw the error myself from the code. So far, I did not succeed.

Do you have any suggestion on how to reproduce it ?

[sbadugu]

@StCostea Please move on to the other tickets, if you can't reproduce it.