Github user chiwanpark commented on the pull request:
https://github.com/apache/flink/pull/1033#issuecomment-135360987
I'm inclined to the @tillrohrmann 's comment. I think that it is okay to
call GraphAlgorithm based on Scala API in Java API and the user has the
responsibility to verify type.
Since cf88407, we have to add return type into generic parameter.
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