[keefe]

I responded before reading the full post, stick with what you know and do restful json, couchdb is also worth looking into for prototyping. As long as your interfaces are clean you should be good. Also consider security.

[manish_chhabra]

Thanks, I have decided to use RESTful JSON with Spring 3 + Jackson, mysql db.

[keefe]

why mysql instead of postgres?

[manish_chhabra]

I have been reading about postgres after your comment but still not able to see how feature rich and less mature postgres would benefit me more?

I haven't used postgres before so I am not the best person to comment on it. Is there any significant advantage of using Postgres of MySql?