I've really enjoyed using Play framework 1.X on Google App Engine with Siena for data storing.
Now I'm looking into using Play framework 2.0 for a new project. As Play isn't ready for GAE I'm going to try out Heroku. What are my options if I want the simplicity of annotating my classes like with Siena and having them stored in some NoSQL database at Heroku? Can I use the built in data storage support in Play or are there any modules that support some NoSQL addon at Heroku?
Edit:
I want to use Play's Java API (not Scala).