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https://issues.apache.org/jira/browse/OAK-4682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15426527#comment-15426527
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Marcel Reutegger commented on OAK-4682:
---------------------------------------
The modification is caused by a concurrent commit updating
{{DocumentNodeStore#changes}}.
> ConcurrentModificationException in JournalEntry.TreeNode
> --------------------------------------------------------
>
> Key: OAK-4682
> URL: https://issues.apache.org/jira/browse/OAK-4682
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: core, documentmk
> Affects Versions: 1.5.6
> Reporter: Marcel Reutegger
> Assignee: Marcel Reutegger
> Fix For: 1.6
>
>
> The JournalDiffLoader introduced in OAK-4528 sometimes causes a
> ConcurrentModificationException in JournalEntry.TreeNode:
> {noformat}
> java.util.ConcurrentModificationException: null
> at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
> at java.util.HashMap$EntryIterator.next(HashMap.java:1463)
> at java.util.HashMap$EntryIterator.next(HashMap.java:1461)
> at
> org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:503)
> at
> org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
> at
> org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
> at
> org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
> at
> org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
> at
> org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
> at
> org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
> at
> org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
> at
> org.apache.jackrabbit.oak.plugins.document.JournalEntry.addTo(JournalEntry.java:312)
> at
> org.apache.jackrabbit.oak.plugins.document.JournalDiffLoader.readTrunkChanges(JournalDiffLoader.java:150)
> at
> org.apache.jackrabbit.oak.plugins.document.JournalDiffLoader.call(JournalDiffLoader.java:74)
> {noformat}
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