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https://issues.apache.org/jira/browse/JCR-4121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Reschke closed JCR-4121.
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> ConcurrentModificationException in InternalVersionHistoryImpl.fixLegacy()
> -------------------------------------------------------------------------
>
> Key: JCR-4121
> URL: https://issues.apache.org/jira/browse/JCR-4121
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: jackrabbit-core
> Affects Versions: 1.4, 1.5, 1.6, 2.0, 2.1, 2.2, 2.4, 2.6, 2.8, 2.10,
> 2.12.0, 2.14
> Reporter: Marcel Reutegger
> Assignee: Marcel Reutegger
> Priority: Minor
> Fix For: 2.12.7, 2.14.1, 2.10.6, 2.4.8, 2.6.9, 2.8.6, 2.15.2
>
> Attachments: JCR-4121.patch, JCR-4121-test-attempt.diff
>
>
> In some cases the method {{InternalVersionHistoryImpl.fixLegacy()}} may
> trigger a {{ConcurrentModificationException}}. The exception is caused by the
> iterator on the {{nameCache.keySet()}}. It only happens when the root version
> points to a successor version which has a same name sibling. In this case the
> {{legacyResolveSuccessors()}} will trigger a {{reload()}}, which in turn
> calls {{init()}} and then clears the {{nameCache}}. A version history does
> not actually allow same name sibling child nodes, but one of the repository
> instance I have access to does show this kind of structure.
> See also related issues JCR-3086 & JCR-1111.
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