je-ik commented on PR #31328:
URL: https://github.com/apache/beam/pull/31328#issuecomment-2120011239

   The problem seems to be related to classloading. When running the test using 
`mvn exec:java` I can see the code (sometimes) tries to load flink-related 
classes using AppClassLoader (which contains only 
`apache-maven-3.8.4/boot/plexus-classworlds-2.6.0.jar`). Maven exec plugin 
created URLClassLoader, which contains all the required dependencies, but that 
is _sometimes_ not used. I can see it is used for loading *some* classes. This 
is very likely Flink bug (1.18).
   
   I'll see if I can change the test to run using `mvn exec:exec`, with correct 
classpath.


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