Github user cestella commented on the issue:
https://github.com/apache/metron/pull/703
Ah, so the setters were correct (which is why things worked in the parser
topology), but the getters weren't, so it couldn't generate valid JSON from
objects with them! I'm +1 on the solution, but will defer to nick if he's
spinning it up. If not, then I'm +1 by inspection as the additional tests
should validate the jackson functionality and there was no version bump for
jackson.
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