Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/1504
Ran this with a simple netcat listener on port 9092 (`nc -l 9092`). First I
was able to reproduce the problem and see the connection attempt in netcat
(when I terminated the process, the test failed). I applied the patch, and ran
again, and saw the tests complete successfully and no requests in netcat. Also
ran in parallel and all tests succeeded.
```
hw12203:/Users/alopresto/Workspace/nifi (master) alopresto
ð 13s @ 23:00:37 $ nc -l 9092
~/testjdbc:h2:tcp://localhost/~/test����^C
hw12203:/Users/alopresto/Workspace/nifi (master) alopresto
ð 165s @ 23:03:23 $ nc -l 9092
^C
hw12203:/Users/alopresto/Workspace/nifi (pr1504) alopresto
ð 147s @ 23:05:51 $
```
Contrib-check passes. Merging.
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