Java framework for social network

Is there a Java analogue to Pinax/Django? (Perhaps an extension to Jboss Seam and/or functionality already built into Seam?)

Please analyse and compare Pinax/Django, Seam, and any other good Java/Python frameworks in the following criteria (ranked in order of importance):

• Security (sensitive financial information)
• Ability to interact with GWT/JSON-RPC (and possibly Pyjamas, though I'm leaning toward GWT due to the availability of visual design applications)
开发者_运维知识库
• Scalability
• Built-in functionality / social network backend logic (e.g. user management, "tweets", etc.)
• Simplicity in setting up and working with
• Synergy with Apache, PostgreSQL, GWT, and mobile applications (iPhone and Android)

If possible, a direct recommendation would be appreciated.

Thanks!

you might want to try Apache Shinding

http://incubator.apache.org/projects/shindig.html

And if you want a youtube demostration try

http://www.youtube.com/watch?v=ZcWszaReqXI

taken from this thread