Java Native Interface: Programmer's Guide and Specification

This book is the definitive resource and a comprehensive guide to working with the JNI. Entirely up-to-date, the book offers a tutorial, a detailed description of JNI features and programming techniques, JNI design justifications, and the official specification for all JNI types and functions.

Developing for the J2EE Tomcat Platform

This online J2EE guide include topics: Java Server Pages, JavaBeans, Tag Libraries, Introduction to Struts, Advanced Struts, Enterprise JavaBeans, A Case Study, Enterprise Objects Framework.

Java 2 Enterprise Edition Developer's Guide

This is an online guide covering J2EE 1.2.1 edition.

 

The Advanced Java/J2EE Tutorial

This is an online J2EE guide by Gopalan Suresh Raj.