Axel Magnuson created BEAM-5454:
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             Summary: Improve Beam Fn API Artifact Staging Service Error 
Handling
                 Key: BEAM-5454
                 URL: https://issues.apache.org/jira/browse/BEAM-5454
             Project: Beam
          Issue Type: Improvement
          Components: java-fn-execution
            Reporter: Axel Magnuson
            Assignee: Axel Magnuson


I noticed that the onComplete logic is not wrapped in a try/catch block.  This 
led to an uncaught NPE in a problem I was debugging.  It also does not log 
errors, preferring to just use the observer's callback to pass these errors to 
the SDK.  However some SDKs such as golang's do not surface these errors, and 
they get lost. 



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