Github user zenfenan commented on the issue: https://github.com/apache/nifi/pull/2585 @sbouchex The project has checkstyle configuration which is checked/enabled when you build with the `contrib-check` Maven profile. The nifi-grpc-processors has some problem in getting built with the complete project. You can do this first `mvn clean -Pinclude-grpc` and then run `mvn -Pcontrib-check install`
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