How to use your own database with your users to authenticate in a Web app?

Hello, everybody!
I'm starting to write my first web application and I'm going to use JSF, JPA and EJB3 in this application. One of the first things that I have to do on it is the authentication part where I'll have a page with a user name and a password for the user to login. So, as I'm new to all this in Java (I've already implemented this on .NET in the past), I was studying the Java EE 5 Tutorial, especifically the section "Example: Using Form-Based Authentication with a JSP Page". But I saw that the users that the sample application uses come from the file realm on the Application Server. The users are created there and assigned a name, a password and a group. After the users are in the Application Server we can simply uses forms authentication declaratively in the deployment descriptor (web.xml).
But the problem is that this doesn't work to me as I already have my own database with my users, so I want to use it instead of having to create the users on the Application Server.
So, I'm asking you how to do that. Of course I'm not expecting that you place the code here to me as I know that such a thing could be complicated. Instead, I'm asking if you know about some tutorial, article, book or something that teaches how to do what I want. But I would like to see theses examples using JSF and/or EJB3 because these are the technologies that I'm using to develop. It's a pity that the Java EE 5 Tutorial doesn't have an example using a custom database as I know that this situation is very common in the majority of web sites.
Thank you very much.
Marcos

From memory, it goes like this... You just create a
raw jdbc connection on your user database using a
special "login" DB user account, which has
permissions only to an "authenticate" stored query,
which accepts two arguments: username & password, and
returns a boolean 0 or 1 rows found.When I implemented this in .NET's ASP.NET I had the same solution. I had an special user created in the database that I used to log in. When the real user entered his username and password I was already logged in and I had just to check his username and password agains the right table in my database.
But that was only possible bacause when I connected to the database using my hidden user, I used the rights APIs in ASP.NET that coordinate the authentication process. This means that before login in, no one could access any resources (pages, atc...). So what I'm saying is that I can't manager this manually in Java. Java has to have some API or whatever to allow me to control the login process programmatically, while letting the Application Server control the access to the resources.

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