One login for multiple apps?

How easy is it under J2EE to implement applications which share a single login?
Specifically, what I'm implementing are a collection of snap-in applications, which will share the user database to some extent (or at least, a common part of it).. So I might have the following applications and web contexts set up..
news.ear (/news/)
forum.ear (/forum/)
games-dice.ear (/games/dice/)
.. and each of the applications running here would ask something central for the user permissions.
I can't just use a single user database, because I want to separate user information specific to one area (per-area admin priveleges, forum settings) from those which are global for the user (email address, web site).
What I'm thinking at the moment, is in the session (there's one of these for the entire server, regardless of which web application the user is in, right?) I'll store the specific user objects for each individual app under different attributes.
If it doesn't exist, and the global user info doesn't exist either, then I ask the user to login, which will associate in the global info. (How do I get to this global info from another app easily?) If the app-specific info doesn't exist in the session, but the global user info does exist, then I'll look up the username in the list for the current application, and use that to decide whether they're permitted to use that specific application.
It all seems very messy. There must be a better way to do it, right?

That's a start ..
Actually, my situation is a little simpler than that, because all those peoples' problems dealt with systems where the username/password were different between the different apps. In my case, I was thinking of the case of one username and password for the site, and a separate kind of ForumUser, NewsUser, etc object for each application, backed by a different database, and with no passwords.
So actually, all I really need (I think) is to have each application aware of the global User classes, so they can pull them out of the session and inspect the username, then use that to look up their own *User objects.
It's looking like a bunch of nearly-identical code in each app to do this .. perhaps I'll implement some sort of taglib to take care of it for me.

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Message was edited by:
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One login for multiple apps?

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