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https://issues.apache.org/jira/browse/MRESOURCES-291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17611179#comment-17611179
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Michael Osipov commented on MRESOURCES-291:
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Provide a sample project.
> CopyResourcesMojo and TestResourcesMojo is NOT thread-safe
> ----------------------------------------------------------
>
> Key: MRESOURCES-291
> URL: https://issues.apache.org/jira/browse/MRESOURCES-291
> Project: Maven Resources Plugin
> Issue Type: Bug
> Reporter: Jin Xu
> Priority: Major
>
> If you try to make several sub-projects using this plugin to copy resources
> from some folter to a same folder, or even overwriting some files, it would
> crush.
> I don't think this be thread-safe.
> I see the codes. you are using File.mkdirs, which is actually not
> thread-safe. also, you are using file writing functions, which is not thread
> safe if multiple threads trying to write to a same file.
> So I don't think it is good to annote these 2 mojos as thread-safe.
> Please either remake that part, or remove the thread-safe annotation.
> Or simply add a synchronized to that function might also be acceptable.
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