Every Java programmer loves free eBooks on Java, don't you? When I shared my collection of top 5 Java programming books, one of my reader asked me to share some free Java books as well. Doing a quick search on internet, reveals lots of free books, resource and tutorials to learn Java. I have chosen some of the good Java books, which are FREE, available for download or you can read it online in HTML or PDF format. This books are excellent resource for any Java beginners, as well as experienced programmer, and since they are free, it makes absolute sense to have a look on this before buying any other book in Java.  This free Java books covers a wide range of technology including core Java, J2EE, JSP, Servlets, XML and general programming concepts. Though books like Effective Java or Java Concurrency in Practice are not free, they are worth of every penny spent. I didn't find any good FREE Java books on concurrency and multithreading, which I really wanted to include. If you come across a genuine FREE multithreading books for Java programmer, then please let us know.