[jira] [Created] (FLINK-16245) Use a delegating classloader as the user code classloader to prevent class leaks.

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-16245:
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             Summary: Use a delegating classloader as the user code classloader to prevent class leaks.
                 Key: FLINK-16245
                 URL: https://issues.apache.org/jira/browse/FLINK-16245
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Task
            Reporter: Stephan Ewen
             Fix For: 1.11.0


As reported in FLINK-11205, a reference to the user-code ClassLoader can be held by some libraries, causing class leaks.

One way to circumvent this class leak is if the ClassLoader that we set as the user-code ClassLoader is a delegating ClassLoader to the real class loader, and when closing the user code ClassLoader we null out the reference.



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