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https://issues.apache.org/jira/browse/LUCENE-10077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17408321#comment-17408321
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Marc D'Mello commented on LUCENE-10077:
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Since the results in this JIRA suggest that the cache might not be doing as
good of a job as we thought it was, it might get removed. I'll get back to this
issue in a few days.
> Closing the DirTaxonomyReader while another thread access the cache can throw
> NPE
> ---------------------------------------------------------------------------------
>
> Key: LUCENE-10077
> URL: https://issues.apache.org/jira/browse/LUCENE-10077
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Affects Versions: main (9.0)
> Reporter: Gautam Worah
> Priority: Minor
>
> When we close a {{DirectoryTaxonomyReader}} in {{doClose}}, we set the
> {{categoryCache}} to null. But if a thread is next after this {{doClose}}
> call, it will still try to acquire a lock and {{synchronize}} on it. This
> will result in an NPE.
> This works well today, because we operate on the assumption that the user
> will always call {{doClose}} after all threads have completed.
> One suggestion by [~mikemccand] in this
> [PR|https://github.com/apache/lucene/pull/179#discussion_r697880516] was to
> make categoryCache final and throw an AlreadyClosedException.
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