I updated the tutorials I wrote about Shiro (http://shiro.apache.org, formerly known as JSecurity and Ki) to use the latest version of the library. Shiro is a "Java security framework that performs authentication, authorization, cryptography, and session management". Shiro became a Top Level Apache project in September 2010 and version 1.1.0 of the library was released in November 2010.
In 2009, when I wrote the tutorials, Shiro was known as JSecurity and was on version 0.9. With the move to the new name and to Apache, the package structure of the library changed. I wanted to update my tutorials so that users trying to learn Shiro would have a better reference.
Shiro is licensed under the Apache Software License, Version 2.0
You can view the tutorials on Shiro (version 1.1.0) starting here.