Java based user account management system

I want开发者_开发问答 to implement user account system for my site just like this, http://getsatisfaction.com/login allowing the user to login using Facebook, Twitter, Google, Yahoo and the like. The site is built using Struts 2 + Spring + Hibernate.

Any Java libraries that would help me in building this kind of user account system?

You might try Scribe.

You might want to look to JOpenID, it is an OpenID 2.0 Java 5 implementation for Google Federated Login. Also SocialAuth for google, yahoo, windows live, twitter and fb. Or maybe a look to JanRain Engage it is free up to 2,500 users.