Github user tillrohrmann commented on the pull request: https://github.com/apache/flink/pull/1033#issuecomment-133332575 I guess that all the tests should then be reworked as you've stated before merging this PR. I think it's fair enough to say that the developer of the algorithm can decide on the input types of the algorithm and the user has the responsibility to convert the input data in the right format. Well as far as I know, you can use Breeze from Java. The only problem is that you have to assemble the implicit operations yourself, because Java is lacking this feature. But once you've done this, it should actually work.
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