Matt Burgess created NIFI-5230:
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             Summary: InvokeScriptedProcessor can issue a NullPointerException 
in customValidate
                 Key: NIFI-5230
                 URL: https://issues.apache.org/jira/browse/NIFI-5230
             Project: Apache NiFi
          Issue Type: Bug
    Affects Versions: 1.6.0
            Reporter: Matt Burgess


NIFI-4968 improved the behavior of InvokeScriptedProcessor when the script has 
an error during parsing/interpretation/compilation, and an improvement was made 
to not output the same validation errors over and over again until manual 
action was taken. As part of that improvement though, a bug was introduced 
where a NullPointerException can occur.

Proposed fix is not to set the validation results to null on "clear", but 
rather to an empty Set (which the code is expecting)



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