IMP JAVA Links

JAVA-> From creator of the JAVA - http://java.sun.com/docs/books/tutorial/

Basic Java Books:
object oriented programming java. By - balaguruswamy

The Complete Reference, Fifth Edition By - Herbert Schildt

Advance Java Books :
Effective JAVA - Effective Java (2nd Edition) (Java Series) By - Joshua Bloch (Author)

JAVA Puzzle - Java(TM) Puzzlers By - Joshua Bloch (Author), Neal Gafter (Author)

Best java example::
http://java.sun.com/docs/books/tutorial/
javaexplain.com

JSP:
http://java.sun.com/developer/Books/javaserverpages/

Servlets:
http://java.sun.com/products/servlet/resources.html

Servlets & JSP:
Head First Servlets and JSP (Explain both in a simple way)

Best java,jsp,servlet,jdbc,hibernate, PostgreSQL interview Q&A.

JAVA IDE:
NetBeans:http://www.netbeans.org/
Eclipse:www.eclipse.org/

Others IMP. Links:

free ebooks Downloading site: www.esnips.com/

Learn How Everything Works! : www.howstuffworks.com