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https://issues.apache.org/jira/browse/NIFI-1636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15198147#comment-15198147
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Ricky Saltzer commented on NIFI-1636:
-------------------------------------

That is correct, except if your processor hits an exception you did not expect. 
The parent class ({{AbstractProcessor}}) eats the stacktrace and only throws 
the shorthand exception. 

See:
https://github.com/apache/nifi/blob/master/nifi-api/src/main/java/org/apache/nifi/processor/AbstractProcessor.java#L30

I have a patch and have tested it. Making sure all tests check out before 
uploading the patch. 

> Print entire stacktrace when unexpected exception occurs during onTrigger
> -------------------------------------------------------------------------
>
>                 Key: NIFI-1636
>                 URL: https://issues.apache.org/jira/browse/NIFI-1636
>             Project: Apache NiFi
>          Issue Type: Improvement
>            Reporter: Ricky Saltzer
>            Assignee: Ricky Saltzer
>
> As of now the try/catch clause in the {{AbstractProcessor}} class doesn't 
> print the entire stacktrace when a processor throws an unexpected exception. 
> Printing the entire stacktrace comes especially in handy when users are 
> creating custom processors for internal use.
> The difference in information can be seen below:
> *Before*
> {code}
> java.lang.NumberFormatException: For input string: "five"
> {code}
> *After*
> {code}
> java.lang.NumberFormatException: For input string: "five"
>       at 
> java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
>       at java.lang.Integer.parseInt(Integer.java:580)
>       at java.lang.Integer.parseInt(Integer.java:615)
>       at TestException.main(TestException.java:5)
> {code}



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