Jerry Cwiklik created UIMA-5906:
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Summary: UIMA-AS: Fix NPE when sending thread is interrupted
Key: UIMA-5906
URL: https://issues.apache.org/jira/browse/UIMA-5906
Project: UIMA
Issue Type: Bug
Components: Async Scaleout
Reporter: Jerry Cwiklik
Assignee: Jerry Cwiklik
Fix For: 2.10.4AS
A user reported the following scenario:
when sendAndReceiveCas() of an AS Engine is Thread.interrupt()-ed it can happen
that the ActiveMQMessageSender does not have a cacheEntry of the CAS that's
sending the request anymore [1] for that a warning is logged.
However directly after that the cacheEntry is deferenced leading to a NPE [2].
This exception will then be swallowed by BaseMessageSender [3] and the process
will be retried [4].
This behavior is rather unfortunate.
It would be benefitial to add a null check at [2] that the cacheEntry is there
before accessing ist. Also at [3] instead of swallowing all exceptions they
should be logged at debug level.
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