Skip to main content

This content has been archived and is no longer being updated. Links may not function; however, this content may be relevant to outdated versions of the product.

Support Article

MDB Listeners stop processing and cannot be restarted

SA-55565

Summary



Pega 7.3 is run on WebSphere Application Server (WAS) 8.5.5.12 which is connected to an IBM WebSphere MQ Queue Manager.

MDB Listeners listen for incoming messages on several different IBM WebSphere MQ Queues.
When running MDB Listeners for several weeks, the listeners stop processing. Unable to restart the listeners without restarting the WAS.



Error Messages



Java "Stack-Trace" of the running Application Server is obtained.
Based upon the contents of this file, the reason that the MDB Listeners have stopped processing seems to be because of a Java "Deadlock" between code within:

...
at com/pega/pegarules/priv/util/KeybasedLock$RequestToken.lock(KeybasedLock.java:170(Compiled Code))
at com/pega/pegarules/priv/util/KeybasedLock.lock(KeybasedLock.java:93(Compiled Code))
at com/pega/pegarules/exec/internal/basic/dictionary/ConclusionTypeCacheImpl$ConclusionKeyBasedLock.lock(ConclusionTypeCacheImpl.java:1287(Compiled Code))
...

and
...
at com/pega/pegarules/exec/internal/declare/infengine/cbi/DeclarativeCacheManagerImpl.getPropertyUsageType(DeclarativeCacheManagerImpl.java:922(Compiled Code))
at com/pega/pegarules/exec/internal/declare/infengine/cbi/DeclarativeCacheManagerImpl.isPropertyDeclarativeSource(DeclarativeCacheManagerImpl.java:715(Compiled Code))
at com/pega/pegarules/data/internal/dictionary/PropertyInfoConclusionImpl.initialize(PropertyInfoConclusionImpl.java:298)
...



Steps to Reproduce



Unknown


Root Cause



A defect in Pegasystems’ code or rules.
Deadlock between Declarative Cache and Conclusion Cache while deploying a new application.



Resolution



Perform the following local-change:

Disable high usage agents while deploying new applications.

Published August 1, 2018 - Updated October 8, 2020

Was this useful?

0% found this useful

Have a question? Get answers now.

Visit the Collaboration Center to ask questions, engage in discussions, share ideas, and help others.

Did you find this content helpful?

Want to help us improve this content?

We'd prefer it if you saw us at our best.

Pega Community has detected you are using a browser which may prevent you from experiencing the site as intended. To improve your experience, please update your browser.

Close Deprecation Notice
Contact us