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https://issues.apache.org/jira/browse/FLINK-25972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17500666#comment-17500666
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Francesco Guardiani commented on FLINK-25972:
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This seems to be fine, look at the method {{JaninoRelMetadataHandler#compile}}:
The generated class always generates a classloader, and this classloader will
use {{JaninoRexCompiler.class.getClassLoader()}} as parent classloader, which
should be the {{AppClassLoader}}. So I don't see the leak here. Does it makes
sense? Also [~twalthr]
> org.apache.calcite.rel.metadata.JaninoRelMetadataProvider#HANDLERS might
> cause class leaks
> ------------------------------------------------------------------------------------------
>
> Key: FLINK-25972
> URL: https://issues.apache.org/jira/browse/FLINK-25972
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Planner
> Affects Versions: 1.15.0
> Reporter: Yun Gao
> Priority: Major
>
> JaninoRelMetadataProvider -> static field HANDLERS -> generated class
> GeneratedMetadataHandler_ColumnNullCount loaded by
> org.codehaus.janino.ByteArrayClassLoader. This cache seems to use the strong
> references.
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