Github user vrozov commented on the pull request:
https://github.com/apache/incubator-apex-core/pull/199#issuecomment-170147744
Agree that whether or not "recommendation" should translate to warnings or
not is a different topic.
As compile prints both warnings and errors, I think it should be OK to
print both errors and warnings for checkstyle as well and we should not require
extra step.
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