I'm new to Play for Scala (looking forward to the new book!), but my understanding is that it started out as a Java framework, migrated to Scala as well, and is now mostly Scala-based but with a Java version as well. Is this correct?
Given that you are supporting two distinct programming paradigms - FP and OOP - have you found any particular problems in achieving this synthesis, and what compromises do you feel were necessary that might not have been required in a purely OOP/FP context?