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Support Article

MDB Listeners stop processing and cannot be restarted



Pega 7.3 is run on WebSphere Application Server (WAS) 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$RequestToken.lock( Code))
at com/pega/pegarules/priv/util/KeybasedLock.lock( Code))
at com/pega/pegarules/exec/internal/basic/dictionary/ConclusionTypeCacheImpl$ConclusionKeyBasedLock.lock( Code))

at com/pega/pegarules/exec/internal/declare/infengine/cbi/DeclarativeCacheManagerImpl.getPropertyUsageType( Code))
at com/pega/pegarules/exec/internal/declare/infengine/cbi/DeclarativeCacheManagerImpl.isPropertyDeclarativeSource( Code))
at com/pega/pegarules/data/internal/dictionary/PropertyInfoConclusionImpl.initialize(

Steps to Reproduce


Root Cause

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


Perform the following local-change:

Disable high usage agents while deploying new applications.

Published August 1, 2018 - Updated October 8, 2020

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