Github user jeffoxenberg commented on the issue:
https://github.com/apache/nifi/pull/602
Thanks for working with me on this.
The real flow's value was double quoted, it was parsed from JSON.
[Here's](https://gist.github.com/jeffoxenberg/6f12bb11b7359e10180712500cb528e7)
the flow that I originally got the error from and here's a sample of the json
message that nifi would consume from kafka: {"senstype": "temp3", "ts":
"2016-07-01T20:52:46Z", "value": 8.72}. It also gave me an error when I used
UpdateAttribute to insert the values directly instead of using variables from
parsed JSON.
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