Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/17819
The issue is the in the trait `setXXX` returns `this.type` which in Java in
the concrete class doesn't work, so the `setXXX` methods need to be implemented
in the concrete subclass. See the decision tree algos for example of this. The
`getXXX` are ok since they typically return a concrete type.
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