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https://issues.apache.org/jira/browse/QPID-2931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12929343#action_12929343
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Robbie Gemmell commented on QPID-2931:
--------------------------------------
Removed used of the AtomicReferenceUpdater to null/retrieve the entry during
release, and replaced with a guarding AtomicBoolean to ensure the continued
once-only effect of onRelease() when releasing the MessageReference.
> nulling the MessageReference handle on the Message during QueueEntry disposal
> can result in NPE
> -----------------------------------------------------------------------------------------------
>
> Key: QPID-2931
> URL: https://issues.apache.org/jira/browse/QPID-2931
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.6
> Reporter: Robbie Gemmell
> Assignee: Robbie Gemmell
> Priority: Critical
> Fix For: 0.7
>
>
> Nulling the MessageReference handle on the Message during QueueEntry disposal
> can result in NPE in various places throughout the broker, when attempts from
> seperate areas of the broker to retrieve details that are held only in the
> Message overlap the reference update and encounter unexpected NPE's. The
> reference nulling should be removed until this can be accounted for. (It is
> no longer as necessary as it once was, thanks to more aggressive QueueEntry
> scavenging in the QueueEntryList)
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