To echo other comments, Play! + Java is awesome and refreshing. However, I tried Play with Scala a few months ago and found it to be unstable (slower start-up times and regularly occurring segfaults during code reloading). I'm hoping v1.2 is a little better in this regard. Has anyone else tried Play with Scala?
It would be good to know if Play+Scala will have feature parity with Play+Java in the future, or if it's always going to be playing catch up. I'm considering Play for a new project and would prefer to use Scala, but the impression I get is that the Java version is the primary focus.