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https://issues.apache.org/jira/browse/MPMD-297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17032627#comment-17032627
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Andreas Dangel commented on MPMD-297:
-------------------------------------
A snapshot of the plugin with this fix is available at
[https://repository.apache.org/content/repositories/snapshots/org/apache/maven/plugins/maven-pmd-plugin/3.13.1-SNAPSHOT/]
Just use
{code:java}
<repository>
<id>apache.snapshots</id>
<url>https://repository.apache.org/content/repositories/snapshots/</url>
</repository> {code}
and version 3.13.1-SNAPSHOT of maven-pmd-plugin to test.
> Classloader not being closed after PMD run
> ------------------------------------------
>
> Key: MPMD-297
> URL: https://issues.apache.org/jira/browse/MPMD-297
> Project: Maven PMD Plugin
> Issue Type: Bug
> Reporter: Andreas Dangel
> Assignee: Andreas Dangel
> Priority: Major
> Fix For: 3.14.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> In order to support type resolution, PMD uses the compile-time classpath of
> the analyzed project in order to resolve types. This is done by creating a
> extra URLClassloader. However, this classloader is not closed at the end of
> the PMD run which causes file leaks and might lead to "too many open files"
> errors for large projects.
> See MNG-6836.
>
> The classloader should be closed here in PmdReport
> ([https://github.com/apache/maven-pmd-plugin/blob/0068cebdad1c79ffa21bba648cbfb7e6c2007da9/src/main/java/org/apache/maven/plugins/pmd/PmdReport.java#L568-L569)]
> with e.g. the following code:
>
> {code:java}
> finally
> {
> ClassLoader classLoader = pmdConfiguration.getClassLoader();
> if (classLoader instanceof ClasspathClassLoader)
> {
> IOUtil.tryCloseClassLoader(classLoader);
> }
> }
> {code}
> ClasspathClassLoader and IOUtil are from PMD and need to be used until PMD
> provides a better API (like pmdConfiguration.close(), etc.).
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