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Posted to dev@qpid.apache.org by "Andrew MacBean (Updated) (JIRA)" <ji...@apache.org> on 2012/02/09 12:57:00 UTC
[jira] [Updated] (QPID-3823) ServerSession unblock(AMQQueue) can
cause NPE when trying to remove a queue from _blockingQueues Map that is
not present
[ https://issues.apache.org/jira/browse/QPID-3823?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrew MacBean updated QPID-3823:
---------------------------------
Attachment: 0001-QPID-3823-ServerSession-unblock-AMQQueue-can-cause-N.patch
> ServerSession unblock(AMQQueue) can cause NPE when trying to remove a queue from _blockingQueues Map that is not present
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: QPID-3823
> URL: https://issues.apache.org/jira/browse/QPID-3823
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.15
> Reporter: Andrew MacBean
> Assignee: Andrew MacBean
> Fix For: 0.15
>
> Attachments: 0001-QPID-3823-ServerSession-unblock-AMQQueue-can-cause-N.patch
>
>
> When running multiple producers and a single consumer on a queue, the unblock code NPEs when trying to remove a queue entry, from the _blockingQueues Map, that is not present. This is due to the Map being given a Boolean keyed by Queue and in the case above the Map.remove() method returns null.
> The data structures used to hold the blocking queues and sessions used in SimpleAMQQueue and the AMQSessionModel implementations (ServerSession & AMQCHannel) should be changed from ConcurrentMaps to Sets - specifically ConcurrentSkipListSet. This will prevent the NPE from being possible.
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