I always forget these names.
Troubleshooting Java & JVM issues
This is a collection of links to articles discussing troubleshooting and tuning Java programs and JVMs.
Java Type Notation
Quick reference for Java type notation.
A series of articles building up to a functioning Web Application that uses J2EE Security on JBoss 4.3.x with OpenLDAP as a User Repository.
Information regarding the J2EE/JEE family of specifications.