Github user yanboliang commented on the pull request:
https://github.com/apache/spark/pull/13353
@jkbradley Yes, we can fix it, but it may involves lots of changes which is
not reasonable to be get in during QA. The main cause of this bug is that we
only implement abstract class ```JavaParams``` who is the wrappers of Scala
trait ```Params```, and we still need Java-friendly wrappers for all other
traits who extends from Scala ```Params```. Then all inherited traits will be
generated correctly in Java.
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