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https://issues.apache.org/jira/browse/QPID-7001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15123429#comment-15123429
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Keith Wall commented on QPID-7001:
----------------------------------
This is related to the accepting channel and specifically that selection key's
attachment. The attachment object is coming back null. We change the
attachment in only three places only: SelectorThread#addAcceptingSocket when
the socket is first opened, when re-adding interest *after* processing the
socket's accept backlog and when temporarily deregister interest just after
being notified isAcceptable() before scheduling the backlog. The latter two in
SelectorThread.SelectionTask#processSelectionKeys().
Superficially the algorithm seems fine. The only time we register attachment
null is when are not interested, so we should never get into a situation where
we are notified with a null attachment. Whenever we register interest, we add
the attachment.
I think we need to run with more logging so understand the issue better.
> [Java Broker] NullPointerException can be thrown from Port IO Thread
> --------------------------------------------------------------------
>
> Key: QPID-7001
> URL: https://issues.apache.org/jira/browse/QPID-7001
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: qpid-java-6.0, qpid-java-6.1
> Reporter: Alex Rudyy
> Attachments: 0001-WIP-Add-system-test.patch, test.log.tar.gz
>
>
> I run into the following issue in my tests:
> {noformat}
> ########################################################################
> #
> # Unhandled Exception java.lang.NullPointerException in Thread
> IO-pool-Port-amqp-1
> #
> # Exiting
> #
> ########################################################################
> java.lang.NullPointerException
> at
> org.apache.qpid.server.transport.SelectorThread$SelectionTask$1.run(SelectorThread.java:190)
> at
> org.apache.qpid.server.transport.SelectorThread.run(SelectorThread.java:457)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> {noformat}
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