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https://issues.apache.org/jira/browse/OPENJPA-2725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16309803#comment-16309803
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Eran Levy commented on OPENJPA-2725:
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removed unnecessary if statement based on [~ilgrosso] code review
> fix ConcurrentModificationException during unrefed dependents cleanup
> ---------------------------------------------------------------------
>
> Key: OPENJPA-2725
> URL: https://issues.apache.org/jira/browse/OPENJPA-2725
> Project: OpenJPA
> Issue Type: Bug
> Components: kernel
> Affects Versions: 2.2.3, 2.4.2
> Reporter: Eran Levy
> Priority: Minor
>
> Committed a fix - pull request #9: https://github.com/apache/openjpa/pull/9
> In some situations there are state elements in _derefCache HashSet causing
> ConcurrentModificationException because set has been modified during
> iteration.
> Copy all elements into another set and calling the same
> deleteDeref(StateManagerImpl sm) function.
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