[jira] [Created] (FLINK-32029) FutureUtils.handleUncaughtException swallows exceptions that are caused by the exception handler code

[Matthias Pohl (Jira)]

Matthias Pohl created FLINK-32029:
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             Summary: FutureUtils.handleUncaughtException swallows exceptions 
that are caused by the exception handler code
                 Key: FLINK-32029
                 URL: https://issues.apache.org/jira/browse/FLINK-32029
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Coordination
    Affects Versions: 1.16.1, 1.17.0, 1.18.0
            Reporter: Matthias Pohl


I ran into an issue in FLINK-31773 where the passed exception handler relies on 
the {{leaderContender}} field of the {{DefaultLeaderElectionService}}. This 
field can become {{null}} with the changes of FLINK-31773. But the {{null}} 
check was missed in the error handling code. This bug wasn't exposed because 
{{FutureUtils.handleUncaughtException(..)}} expects the passed error handler 
callback to be bug-free.



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