[jira] [Created] (MCHECKSTYLE-457) memory leak in checkstyle plugin

["James Nord (Jira)" <ji...@apache.org>]

James Nord created MCHECKSTYLE-457:
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             Summary: memory leak in checkstyle plugin
                 Key: MCHECKSTYLE-457
                 URL: https://issues.apache.org/jira/browse/MCHECKSTYLE-457
             Project: Maven Checkstyle Plugin
          Issue Type: Bug
          Components: checkstyle:check
    Affects Versions: 3.6.0
            Reporter: James Nord
         Attachments: image-2025-04-11-12-55-18-038.png

memory used by checkstyle:check mojo is not released after the mojo completes its analysis.

In a build on [Jenkins|https://github.com/jenkinsci/jenkins/] an analysis of a heapdump shows that there is 180+MB retained by the JavaLanguageParser



!image-2025-04-11-12-55-18-038.png|thumbnail!

After the invocation of the mojo it is expected that memory would be relinquished.

h3. Steps to reproduce

* clone https://github.com/jenkinsci/jenkins/
* switch to the {{jenkins-2.504}} branch
* edit .mvn/jvm.config so it contains the following (to force running out of memory and providing a heap dump): 

{code:properies}
-Xmx500M
-XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=D:\source\github\cloudbees\private-jenkins
{code}
* run {{mvn clean verify -DskipTests}}

h3. Expected results

500M should be enough to build, or if the build fails due to memory there is no memory held by mojos (for part of their actions) that have completed.

h3. Actual Results

the build fails producing the war in the maven-war-plugin (in the war project).
Inspection of the heap shows 180MB in use by com.puppycrawl.tools.checkstyle.grammar.java.JavaLanguageParser classloaders
   



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