Github user YolandaMDavis commented on the issue:
https://github.com/apache/nifi/pull/690
@markap14 retried tests again using a similar setup as before yet included
an input port on the standalone server in addition to the output port.
Performed a variety of tests attempting to create and update connections made
to and from the Remote Processor Group. I did see (after deleting ports and
waiting 30 seconds) that an appropriate error message was received based on the
null checks you made on your last commit. And when I attempted to delete and
create/update a connection quickly I saw the system eventually display a
warning bulletin that the connection was invalid.
I was unable to trigger any of the IllegalArgumentExceptions that were
added to verifyCreate in the StandardConnectionDAO, which made me wonder
whether or not recent changes prevented that from even occurring? Or whether
that it's a very small edge case being accounted for?
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