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https://issues.apache.org/jira/browse/UIMA-6399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17478744#comment-17478744
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Richard Eckart de Castilho commented on UIMA-6399:
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Superseded by UIMA-6412 (stop using ThreadGroup in CPE).
> RutaPatternCache prevents CPEEngine from terminating
> ----------------------------------------------------
>
> Key: UIMA-6399
> URL: https://issues.apache.org/jira/browse/UIMA-6399
> Project: UIMA
> Issue Type: Bug
> Components: Ruta
> Reporter: Richard Eckart de Castilho
> Assignee: Richard Eckart de Castilho
> Priority: Major
> Fix For: 2.9.0ruta, 3.1.1ruta
>
> Attachments: Screenshot 2021-12-10 at 17.38.08.png
>
>
> The {{RutaPatternCache}} creates a Caffeine cache internally which spawns a
> cleanup worker thread. If this thread is spawed while Ruta is running in a
> CPE, then the thread is added to the CPE's thread group. When the CPE is done
> processing, it waits for all the worker threads in its group to terminate.
> Normally, these are only the reader thread, the processor threads, the
> consumer thread, and the thread-group destroyer thread. The extra thread
> added via Caffeine causes the thread-group destroyer to believe that there
> are still workers running and thus it will never terminate the CPEEngine.
> That means, the engines and resources used in the engine will never be GCed.
> !Screenshot 2021-12-10 at 17.38.08.png|width=50%!
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