Github user ijokarumawak commented on the issue: https://github.com/apache/nifi/pull/2363 Hi @mgaido91 @joewitt , I was investigating the root cause of the issue. Finally, I think I was able to reproduce the ArrayIndexOutOfBoundsException with JoltTransformJson processor. You can find details in this Gist with a reproducible NiFi flow template. NOTE, this is not reproducible anymore with current NiFi 1.5.0 snapshot, you need to test it with older version of NiFi. https://gist.github.com/ijokarumawak/65f51ea49029c1eafcc62c39e1a606bc Does it seem reasonable? If that is the root cause we're looking for, then it doesn't caused by concurrent use of JsonUtils.
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