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https://issues.apache.org/jira/browse/DIRMINA-1047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Emmanuel Lecharny resolved DIRMINA-1047.
----------------------------------------
    Resolution: Fixed

Marked as fixed.

> NullPointerException in AbstractIoSession.destroy()
> ---------------------------------------------------
>
>                 Key: DIRMINA-1047
>                 URL: https://issues.apache.org/jira/browse/DIRMINA-1047
>             Project: MINA
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.0.15
>         Environment: Any
>            Reporter: Carl Wicklow
>             Fix For: 2.0.16
>
>
> After upgrading to *v2.0.15*, we get this NPE ...
> {noformat}
> java.lang.NullPointerException
>       at 
> org.apache.mina.core.session.AbstractIoSession.destroy(AbstractIoSession.java:369)
>       at 
> org.apache.mina.core.session.AbstractIoSession.closeNow(AbstractIoSession.java:350)
>       at 
> org.apache.mina.core.session.DefaultIoSessionDataStructureFactory$DefaultWriteRequestQueue.poll(DefaultIoSessionDataStructureFactory.java:222)
>       at 
> org.apache.mina.core.polling.AbstractPollingIoProcessor.flushNow(AbstractPollingIoProcessor.java:827)
>       at 
> org.apache.mina.core.polling.AbstractPollingIoProcessor.flush(AbstractPollingIoProcessor.java:767)
>       at 
> org.apache.mina.core.polling.AbstractPollingIoProcessor.access$700(AbstractPollingIoProcessor.java:68)
>       at 
> org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1125)
>       at 
> org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>       at java.lang.Thread.run(Thread.java:745)
> {noformat}
> If I'm reading it right, the destroy also needs to allow that the 
> writeRequest  returned by the poll() of the WriteRequestQueue may return null 
> if the queue is empty.
> In our case the destroy was invoked after polling a CLOSE_REQUEST caused by 
> an earlier closeOnFlush(), and the write request queue was empty.
> {code:title=AbstractIoSession.java|borderStyle=solid}
>     protected void destroy() {
>         if (writeRequestQueue != null) {
>             while (!writeRequestQueue.isEmpty(this)) {
>                 WriteRequest writeRequest = writeRequestQueue.poll(this);
>                 WriteFuture writeFuture = writeRequest.getFuture();
>                 
>                 // The WriteRequest may not always have a future : The 
> CLOSE_REQUEST
>                 // and MESSAGE_SENT_REQUEST don't.
>                 if (writeFuture != null) {
>                     writeFuture.setWritten();
>                 }
>             }
>         }
>     }
> {code}



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