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Support Article

Production server hangs with NullPointerExceptions



You are working in the application and experience significant slowness of the process. Eventually the system just hangs and does not respond at all.

Error Messages

Before the server becomes unavailable, a null pointer exception is seen in the logs:
10:15:35,268 [ PegaRULES-Batch-2] (Rule1.Link_Attachment) ERROR MyListener - Exception caught while evaluating when

Steps to Reproduce

Not identified.

Root Cause

The root cause of this problem is a defect in Pegasystems’ code/rules. Error in list handling under certain conditions.


This issue is resolved by hotfix item HFix-21794.

Published January 31, 2016 - Updated October 8, 2020

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