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https://issues.apache.org/jira/browse/MYFACES-4049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15319048#comment-15319048
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Bill Lucy commented on MYFACES-4049:
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I've tested the patch locally, and it looks fine to me; this makes sense.
> JSF myfaces unsynchronized access to a WeakHashMap
> ---------------------------------------------------
>
> Key: MYFACES-4049
> URL: https://issues.apache.org/jira/browse/MYFACES-4049
> Project: MyFaces Core
> Issue Type: Bug
> Affects Versions: 2.0.24, 2.2.10
> Reporter: Eduardo Breijo
> Attachments: MYFACES-4049.patch
>
>
> WebContainer threads are hanging due to a thread safety issue in the
> underlying JSF 2.0 code. A non thread-safe WeakHashMap is being used in the
> getRelativePath method of the DefaultFacelet class. Apache JSF 2.0 code is
> not synchronizing on their usage of WeakHashMap in
> org.apache.myfaces.view.facelets.impl.DefaultFacelet.getRelativePath.
> In order to make the code thread-safe Collections.synchronizedMap method
> needs to be used.
> A patch has been provided.
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