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https://issues.apache.org/jira/browse/QPID-6712?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Keith Wall updated QPID-6712:
-----------------------------
    Attachment: selectors_npe_fix.patch

WIP patch.  Need to address similar changes in the Derby store.  The change to 
the broswer code paths needs to be raised as a separate issue.

> Queue Runner may observe a message after it has been dequeued/deleted
> ---------------------------------------------------------------------
>
>                 Key: QPID-6712
>                 URL: https://issues.apache.org/jira/browse/QPID-6712
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Broker
>    Affects Versions: qpid-java-6.0
>            Reporter: Keith Wall
>         Attachments: selectors_npe_fix.patch
>
>
> We have observed a problem in the Broker where the QueueRunner can observe a 
> message after it has changed state to DEQUEUED/DELETED.  This gives rise to a 
> NPE.    This problem has been exposed by changes made by QPID-6662 which 
> agreessively null references when deleting messages from the store.



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