Support Article

ConcurrentModificationException is blocking sync queues

SA-31987

Summary



The number of agent's queues are blocked and not synced to the server due to a ConcurrentModificationException. This affects select agents and is systemic for those agents. Most of the queues are long with older items.

Error Messages



**Date and time**,121 [.PRPCWorkManager : 0] [ STANDARD] [tionOffline:01.02.01] (ReceiveItems._baseclass.Action) ERROR
A2031969 - Start async HTTP service for SYSTEM-QUEUE-EXECUTIONREQUEST-SERVICE-DEFAULT SYSTEM-QUEUE-EXECUTIONREQUEST-
SERVICE-DEFAULT 147780734495600031592B9B017CFC0CE65119CABEFA1C90
**Date and time**,348 [.PRPCWorkManager : 0] [ STANDARD] [tionOffline:01.02.01] ( internal.mgmt.Executable) ERROR A2031969 - Exception
java.util.ConcurrentModificationException


Steps to Reproduce



Unknown

Root Cause



A defect in Pegasystems' code or rules is identified as root cause for the issue.

Resolution

  1. Apply HFix-30822.
  2. Restart the application server.
  3. Apply HFix-30574.

Published December 29, 2016 - Updated January 3, 2017

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