Some best books on Java

Effective Java















Java in a Nutshell














Thinking in java

















Head First Java
















Java Puzzlers













Core Java - volume 1 and volume 2













However if you a java programmer, their are other parts in programming as well, like concurrency, design patterns and many more.  So there are books on that as well. You can read about these books over here.

If you some good book is not included here, please tell me that in comment. I will include that book. Thanks :)

Some good books on Domain Driven Development

 Domain Driven Design By Eric Evans














 Applying Domain Driven Design and Pattern by Jimmy Nilsson


















 Domain Driven Design quickly by Abel Avram












Domain Driven Design using Naked Object by Dan Haywood

Free downloadable tech books

http://www.freetechbooks.com/
As you'd expect, the list includes a lot of stale and/or not-very-valuable titles, but there's also a lot of genuinely worthwhile stuff there. Judging from their "most popular" list, the site is a big hit with C++ programmers. But there are also few free Java books, and lots of timeless reference material for programmers of all stripes.