JAVA...

Processing XML with Java

Processing XML with Java by Elliotte Rusty Harold is available online. It has chapters covering Writing XML with Java, SAX, DOM, JDOM, JAXP, TrAX, XPath, XSLT, SOAP, and lots of other information in 1000 pages.

1000 Java Tips

Now you can get 1000 Java Tips book for free. It has tips covering various Java topics.

Java Platform Performance: Strategies and Tactics

Java Platform Performance is a comprehensive field manual full of battle-tested strategies and tactics for developing high-performance applications and applets with Java technology.

How to Think Like a Computer Scientist Java Version

Free online book by Green Tea Press. How to Think Like a Computer Scientist Java Version is a good book to learn about programming.

Essentials of the Java Programming Language

This online book covers lessons like Compiling and Running a Simple Program, Building Applications, Building Applets, Building a User Interface, Writing Servlets and File Access and Permissions.