Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/2919
I merged this but made two changes. First, the `nifi-web-utils` tests were
not running, because they are Groovy tests and there is nothing in
`src/test/java`. Without a file (even empty) in that directory, the Groovy
tests do not get picked up (neither compiled nor run). I added the
`groovy-eclipse-compiler` plugin to `nifi-web-utils/pom.xml` to ensure this is
run. That commit is
[5c0232c](https://github.com/alopresto/nifi/commit/5c0232c9dd8009dc69bc5adb1fb1ef7942832911).
Second, there was a warning about a duplicate definition of `httpclient`
dependency in `nifi-web-utils/pom.xml`. I removed it, and that commit is
[5f538c6](https://github.com/alopresto/nifi/commit/5f538c69f1aebc0b6b0d6dbabf0f09c8e9854a57).
Both of those commits were rebased onto Nathan's rebased commits as well.
A gist demonstrating the issue is
[here](https://gist.github.com/alopresto/184f3631ec44a4c036d323d622ea97aa).
Ran `contrib-check` and all tests pass. +1, merging.
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