TinyRadius is a simple, small and fast Java Radius library capable of sending and receiving Radius packets of all types. It is released under the terms of the LGPL.
For documentation, please have a look at doc/tinyradius.html and doc/apidoc. Every method has got JavaDoc comments, and every package has got a package.html document detailing the package usage.
Please do not hesitate to contact me if you have got questions or suggestions.