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https://issues.apache.org/jira/browse/GROOVY-12142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18105190#comment-18105190
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Paul King commented on GROOVY-12142:
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It seems like we didn't document the option meant for cases like yours: use
-Dgroovy.use.classvalue=false on the Tomcat JVM (JVM-wide, per-webapp Groovy
copies each honor it).
As an alterbative, add a ServletContextListener.contextDestroyed that calls
ClassInfo.remove(c) for every ClassInfo.getAllClassInfo() entry — the public
API's javadoc even names this use case.
Unfortunately, looks like the option was "cleaned up" along with some other
changes for Groovy 5/6. I'm looking at what is involved in reinstating that
functionality.
> Metaspace memory leak with parallel deployments on Tomcat
> ---------------------------------------------------------
>
> Key: GROOVY-12142
> URL: https://issues.apache.org/jira/browse/GROOVY-12142
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 4.0.24, 4.0.29, 5.0.8, 5.1.0, 6.0.0-beta-2
> Environment: Tomcat: 10.1.55
> openjdk version "17.0.19" 2026-04-21 LTS
> OpenJDK Runtime Environment (Red_Hat-17.0.19.0.10-1) (build 17.0.19+10-LTS)
> OpenJDK 64-Bit Server VM (Red_Hat-17.0.19.0.10-1) (build 17.0.19+10-LTS,
> mixed mode, sharing)
> Reporter: Jan Gosmann
> Assignee: Paul King
> Priority: Major
> Attachments: Screenshot 2026-07-09 at 09.46.46.png, spring-test.tar.gz
>
>
> We are using [Tomcat parallel
> deployments|https://tomcat.apache.org/tomcat-10.0-doc/config/context.html#Parallel_deployment]
> to achieve downtimeless deployments. However, we with each new deployment
> the metaspace grows (see attached image). Even after undeploying the old
> version it does not shrink. If we configure a maximum metaspace size, new
> parallel deployments fail with an out-of-memory error.
> I was able to reproduce this with a very simple Spring Boot application
> (attached). As long as I had no Groovy in there, metaspace was reclaimed
> before hitting the maximum on new deploys. After introducing Groovy,
> metaspace is no longer reclaimed.
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