Useful links/reference for programming Java Web application

I will try to keep this post update as new as possible.
Here is the reference.
Javascript:

1. JavaScript Window Object
   

Tag library support:

1. JSTL API document link
2. Struts 2 Tag library
3. DisplayTag Tag reference
   

Tutorial

1. Compass Search
   
2. http://java.dzone.com/articles/introduction-joodamp-framework
3. Hibernate Search Documentation
   

Tools/Web services

1. http://www.findjar.com/ - When you encounter the ClassNotFoundException and you have no idea where is the jar file, check this site first.
   

Art Design:

1. Color schemer- to pick up the color code
2. High Performance JavaScript Vector Graphics Library
3. ColorZilla-a Firefox plugin for color pickup
   

Forum

1. Appfuse