Cote, from the Drunk and Retired Podcast has made his book on the Java Authentication and Authorization Service available for free. In it, he explains how to create Policy, Configuration, and LoginModules that are backed by a database. This should be of interest to some folks I know.
Bieber Labs
Bieber Labs 
Thanks, again, for a link to my stuff! Hopefully, someone out there will like and/or find useful the book.
Hi,
you should look towards jGuard (http://sourceforge.net/projects/jguard) , which implements many concepts present in these chapters….and much more!
enjoy!
Charles(jGuard team).