Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/951
The fix looks like it solves the issue. I imported the `webcrawler.xml`
template from [NiFi
templates](https://cwiki.apache.org/confluence/display/NIFI/Example+Dataflow+Templates)
and configured the controller services, then exported the template
successfully. Without further instructions on how to reproduce the
`NullPointerException`, I believe this is fixed.
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