J2EE 1.3 tutorial
http://java.sun.com/j2ee/tutorial/1_3-fcs/index.html
Java Tutorial
http://java.sun.com/docs/books/tutorial/
DWR
http://directwebremoting.org/dwr/getstarted
Java Generics
http://java.sun.com/j2se/1.5/pdf/generics-tutorial.pdf
Spring Overview
http://www.theserverside.com/tt/articles/article.tss?l=SpringFramework
Spring MVC step by step tutorial
http://static.springframework.org/docs/Spring-MVC-step-by-step/
ExtJS 2.0
http://extjs.com/learn/Tutorial:Introduction_to_Ext_2.0
WSDL
http://www.w3.org/TR/wsdl
Apache Tomcat
http://tomcat.apache.org/
Java Itext Tables
http://tutorials.jenkov.com/java-itext/table.html