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https://issues.apache.org/jira/browse/WICKET-2526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12769623#action_12769623
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Martin Grigorov commented on WICKET-2526:
-----------------------------------------
Quick solution here is to replace in HomePage newTreeState() with
getTreeState():
> ConcurrentModification Exception in TreeState
> ---------------------------------------------
>
> Key: WICKET-2526
> URL: https://issues.apache.org/jira/browse/WICKET-2526
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.4.2
> Reporter: count negative
> Attachments: sessionSet.zip
>
>
> When the TreeState ist saved in the session, pressing F5 (refresh) in browser
> many times, leds to an ConcurrentModificationException. Example project is
> submitted.
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