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https://issues.apache.org/jira/browse/QPID-3219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robbie Gemmell resolved QPID-3219.
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Resolution: Fixed
Patch applied.
> some logic used to find current/available messages may return a QueueEntry
> currently in the dequeued state.
> -----------------------------------------------------------------------------------------------------------
>
> Key: QPID-3219
> URL: https://issues.apache.org/jira/browse/QPID-3219
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.5, 0.6, 0.7, 0.8, 0.9, 0.10
> Reporter: Robbie Gemmell
> Assignee: Robbie Gemmell
> Fix For: 0.11
>
> Attachments: QPID-3219-adds-dequeued-checks.patch
>
>
> Some logic used to find current/available messages may incorrectly
> gather/return a QueueEntry in the dequeued state.
> The QueueEntry state model has an intermediate 'dequeued' state that the
> entry will enter before being disposed of and moved to the 'deleted' state.
> At present, most logic dealing with QueueEntry presence/availability checks
> only that they aren't deleted or that they can be acquired (typically both
> are done in the latter case, but checking the deletion is unnecessary in this
> case since the acquire attempt would fail if it were deleted). There is no
> intended path for a queue entry to transition from being dequeued to anything
> other than the deleted state, and so any logic inspecting for
> current/available messages should also disregard entries in the dequeued
> state.
> Areas known to be affected by the issues include the various
> SimpleAMQQueue#'getMessagesOnTheQueue' type operations in used for tasks
> such as viewing / copying / moving messages via JMX, and also the
> QueueEntryImpl#getNext method used to traverse the QueueEntryList during
> delivery operations.
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