if your application is part of multiple applications that share the same login screen and you need to just login once and be able to use any application without any other login you for sure need SSO, what do you think  about CAS?

yes its a fascinating solutionbut for sure if your company is not an open source solution it will refuse deploying anything (cas.war) on tomcate.

if this was your case so this blog post is for you.

Now we will try to implement a trivial simple SSO implementation using Acegi.