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https://issues.apache.org/jira/browse/COLLECTIONS-340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13639470#comment-13639470
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Thomas Neidhart commented on COLLECTIONS-340:
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It looks like this change has been lost during the generics_branch merge.
I think we can keep it as is and highlight it in the release notes.
> NOPClosure has a broken equals method
> -------------------------------------
>
> Key: COLLECTIONS-340
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-340
> Project: Commons Collections
> Issue Type: Bug
> Components: Functor
> Reporter: Goran Hacek
> Priority: Minor
> Fix For: 4.0
>
>
> Equals method of NOPClosure class doesn't follow objects equals contract. It
> isn't symmetric nor transitive and it is just plain wrong.
> Following code evaluates to true on most (if not all) JVM implementations:
> {noformat} NOPClosure.INSTANCE.equals(new
> Integer(System.identityHashCode(NOPClosure.INSTANCE))) {noformat}
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