Top Rated Apache Shiro Alternatives
13 Apache Shiro Reviews
Shiro offers an out of the box functionality to secure your apps easily and without any hassle. It's the library we use in a Grails application we built and it's always reliable. Review collected by and hosted on G2.com.
It might be hard to get into Shiro's terminology of Realms Review collected by and hosted on G2.com.

I used Apache Shiro in one of my projects. It's a highly configurable authentication framework for Java based web applications. It provides role and permission based authentication and authorization facility. The hashing algorithm used for storing the credentials are also user pluggable and you can switch them to the latest and greatest industrial algorithms you want to use. No sweat in using it Review collected by and hosted on G2.com.
Some more how-to guides would be nice to have for using the framework. Review collected by and hosted on G2.com.