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Support Article

Frequent ConcurrentModificationException occurs in the logs

SA-54397

Summary



Frequent ConcurrentModificationException occurs in the logs.


Error Messages



[ WebContainer : 6] [TABTHREAD1] [ ] [ Loan:02.06] (gmt.base.AbstractPageDirectory) ERROR - Tried to remove page: 'pyWorkPage' that is in use: java.util.ConcurrentModificationException
java.util.ConcurrentModificationException
at java.util.AbstractList$SimpleListIterator.next(AbstractList.java:64)
at com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.checkNamedPageForwardLinks(ClipboardPageImpl.java:5470)
at com.pega.pegarules.session.internal.mgmt.base.ThreadPageDir$PageReferenceListener.onBeforeRemove(ThreadPageDir.java:358)
at com.pega.pegarules.session.internal.mgmt.base.handler.AbstractPageHandler.onBeforeRemove(AbstractPageHandler.java:173)
at com.pega.pegarules.session.internal.mgmt.base.handler.UserPageHandler.removePage(UserPageHandler.java:77)
at com.pega.pegarules.session.internal.mgmt.base.AbstractPageDirectory.removeUserPageInCurrentDir(AbstractPageDirectory.java:343)
at com.pega.pegarules.session.internal.mgmt.base.AbstractPageDirectory.removePage(AbstractPageDirectory.java:245)
at com.pega.pegarules.session.internal.mgmt.base.AbstractPageDirectory.removePage(AbstractPageDirectory.java:383)
at



Steps to Reproduce



Unknown.


Root Cause



A defect in Pegasystems’ code or rules.


Resolution

Apply HFix-42609.



Suggest Edit

Published March 27, 2018 - Updated October 8, 2020

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