Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/5330
@zentol FYI
Problem with this is that the tests pass even before the fix, because the
fallback path works. The meiling list thread misses some info as to why the
fallback path does not work for them. The second exception postes is a red
herring, it comes from a dependency messup that shows through child-first
classloading.---
