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https://issues.apache.org/jira/browse/UIMA-1751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jerry Cwiklik closed UIMA-1751.
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Resolution: Fixed
Modified getMessageProducer() in ActiveMQMessageSender to check the state of
the engine before returning the Producer.
> Fix NPE while looking up MessageProducer
> ----------------------------------------
>
> Key: UIMA-1751
> URL: https://issues.apache.org/jira/browse/UIMA-1751
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Affects Versions: 2.3AS
> Reporter: Jerry Cwiklik
>
> ActiveMQMessageSender throws NPE in getMessageProducer() sometimes when the
> UIMA AS client is stopping. A race condition seems to be the cause. A thread
> doing a send tries to dereference engine object after the engine was forced
> to stop.
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