Github user dawidwys commented on the issue:
https://github.com/apache/flink/pull/3468
So as I mentioned in JIRA I don't see a way to do it in checkstyle rule.
I managed to implement a test that performs the check using `Reflections`
but I don't know where shall I place it. The problem is that only files from
packages that are dependencies to the module with this test will be checked.
First idea I had was to put it in the `filnk-tests` module, but it does not
depend on e.g. any of `flink-connectors`
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