Chesnay Schepler created FLINK-9844:
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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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