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https://issues.apache.org/jira/browse/LUCENE-5532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13937585#comment-13937585
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Simon Willnauer commented on LUCENE-5532:
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+1 to the patch - I agree with the change to go away from acceptsSameLanguage!
speedups are also good though. Let's make sure we put this on the change
runtime behavior section in CHANGES.TXT
> AutomatonQuery.hashCode is not thread safe
> ------------------------------------------
>
> Key: LUCENE-5532
> URL: https://issues.apache.org/jira/browse/LUCENE-5532
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-5532.patch, LUCENE-5532.patch
>
>
> This hashCode is implemented based on #states and #transitions.
> These methods use getNumberedStates() though, which may oversize itself
> during construction and then "size down" when its done. But numberedStates is
> prematurely set (before its "ready"), which can cause a hashCode call from
> another thread to see a corrupt state... causing things like NPEs from null
> states and other strangeness. I don't think we should set this variable until
> its "finished".
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