The J2EE 1.4 Tutorial - This tutorial is a beginner's guide to developing enterprise applications using the Java 2 Platform, Enterprise Edition (J2EE) version 1.4.
The J2EE Tutorial for the Sun ONE Platform - This tutorial is a beginner's guide to developing J2EE applications for the Sun Open Networking Environment (Sun ONE) platform.
The Java Language Environment: A White Paper - An eleven part introduction to the Java programming language that starts with why you should learn Java, and continues with detailed explanations to teach you the language.