Nicolas Filotto created GROOVY-10957:
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Summary: How to prevent ClassLoader leaks when using ClassValue?
Key: GROOVY-10957
URL: https://issues.apache.org/jira/browse/GROOVY-10957
Project: Groovy
Issue Type: Question
Reporter: Nicolas Filotto
Attachments: JNI-Global-Reference.png
I'm using [rest-assured|https://github.com/rest-assured/rest-assured] for my
tests which is partially written in Groovy.
In my application, I use a custom ClassLoader to load rest-assured and groovy
classes, after each test the ClassLoader is closed and released to be collected
by the GC.
In case, I launch my tests with {{-Dgroovy.use.classvalue=false}}, the
ClassLoaders are properly removed from the heap but when I use
{{-Dgroovy.use.classvalue=true}}, I end up with an OOME.
I can see thanks to my profiler that each {{ClassLoader}} is actually retained
by a JNI Global Reference to each primitive class ({{void.class}},
{{float.class}}, {{boolean.class}}, {{int.class}}, {{double.class}},
{{long.class}}, {{char.class}}, {{byte.class}}).
If I naively call {{InvokerHelper.removeClass(Class)}} on each of these
classes, my {{ClassLoader}}s don't have any GC root anymore but unfortunatlly
they are still in the heap.
I created a small project to reproduce https://github.com/essobedo/testCLLeak,
any idea/help is more than welcome.
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