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https://issues.apache.org/jira/browse/COLLECTIONS-330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12720974#action_12720974
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Sebb commented on COLLECTIONS-330:
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It works for me - but there needs to be an iter.next() before the 
map.get(iter.getValue()).

> ConcurrentModificationException using remove from the keySet the LRUMap
> -----------------------------------------------------------------------
>
>                 Key: COLLECTIONS-330
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-330
>             Project: Commons Collections
>          Issue Type: Bug
>          Components: Collection
>    Affects Versions: 3.3
>            Reporter: Joerg Schaible
>
> Even if the access to a LRUMap is synced and the remove method of the 
> iterator is used that has been returned from the keySet of the LRUMap, it is 
> possible to get a ConcurrentModificationException. This does not happen for 
> remove of the iterators returned by the entrySet or values of the LRUMap. See 
> currently not executed unit test in TestLRUMap (marked as TODO for 
> COLLECTION-3).

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