Gautam Worah created LUCENE-10077:
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Summary: 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
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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