Github user rmetzger commented on the issue:
https://github.com/apache/flink/pull/3933
Till and I had an offline discussion about this.
What you can do in your user code to set the TCCL properly is the following:
```
Thread.currentThread().setContextClassLoader(this.getClass().getClassLoader());
```
`this` points in user code to a class loaded through the user code
classlaoder. So `this.getClass().getClassLoader()` is the CL you need to set
for the thread.
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