Using anything build in Scala from Java is abysmal. Have fun with no default parameters, creating Seq$.MODULE$ everywhere etc. I'm not from US, so I've never have seen so much dollars anywhere.
I had a little success by simplifying the interop layer. If you can wrap your scala code in simple classes that expose only Java-compatible structure, then you can remove additional complexity of java into scala interop.
You might be able to write a shim layer in Scala. Java interfaces, Scala classes that implement those interfaces and call the third-party code. That's the nicest way to do it IME.
