FactGuru is a knowledge base about Java.

The source for Java Technology Collaboration.

The content is not currently being updated at JavaWorld.

Java API By Example, From Geeks To Geeks.

Jboss, Netbeans, Tomcat, Cocoon; This document takes a user in obtaining these software and setting up a perfect development environment for designing and developing Multi-Tier Enterprise web applications utilizing the various java technologies supported by jboss – Ejb, Jndi, Jms, Jmx etc.

By Craig.