E.g., what about someone who hasn't touched Java in a while, but does have gobs of C++ and Python experience and is willing to dive back into Java?
If your are an awesome Scala (or other) developer who wants to work in Scala (or other) then this is not the place for you.
With that said, productivity in Java is important!
E.g., what about someone who hasn't touched Java in a while, but does have gobs of C++ and Python experience and is willing to dive back into Java?