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Support Article

Agents do not run after a database interruption occurs



Agents do not run after a database interruption occurs. This occurs intermittently. Attempts to stop or restart an affected agent results in an error.

Error Messages

Exception during engine invocation:
java.lang.NoClassDefFoundError: com/pega/pegarules/session/internal/async/AgentQueue$AgentNotification
at com.pega.pegarules.session.internal.async.AgentQueue.notifyAgentTermination(

Steps to Reproduce

After a database interruption, attempt to stop or restart an affected agent.

Root Cause

A defect in Pegasystems’ code or rules.


Apply HFix-45055.


Published July 26, 2018 - Updated October 8, 2020

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