Jan Gosmann created GROOVY-12142:
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Summary: 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: 4.0.29, 4.0.24
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
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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