Github user ijokarumawak commented on the issue: https://github.com/apache/nifi/pull/2510 @mcgilman Thanks for clarifying the String manipulation exception, I just didn't have enough imagination to come up with such invalid inputs. I switched to use regex to check and parse property keys. Now it should be more robust and provide more user friendly error messages. Also, added try/catch for EL parse failure. Thanks!
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