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https://issues.apache.org/jira/browse/FLINK-16245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17501342#comment-17501342
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lizhiqiang commented on FLINK-16245:
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Very helpful
> 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
> Assignee: Arvid Heise
> Priority: Critical
> Labels: pull-request-available, usability
> Fix For: 1.12.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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