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[jira] [Created] (FLINK-9844) PackagedProgram does not close URLClassLoader

Chesnay Schepler created FLINK-9844:

             Summary: PackagedProgram does not close URLClassLoader
                 Key: FLINK-9844
                 URL: https://issues.apache.org/jira/browse/FLINK-9844
             Project: Flink
          Issue Type: Improvement
          Components: Core, Job-Submission
            Reporter: Chesnay Schepler

The {{PackagedProgram}} class creates a user-code classloader to execute the programs {{main}} method.
This classloader is a {{URLClassLoader}} (except in the case of some tests), which contains opened {{JarFiles}} for all accessed jars.

The {{URLClassLoader}} class implements {{Closeable}} for the purpose of cleaning up closeable resources, however we never actually call this method. The {{PackagedProgram}} only works against the {{ClassLoader}} class, which doesn't implement {{Closeable}}.

As a result, deleting a jar after submitting it with the {{JarRunHandler}} currently fails on Windows, since the jar is still in use.

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