The big Java encyclopedia

At java.net you’ll find
 the Java encyclopedia Javapedia.
 In Javapedia you can find information about anything related to Java. The encyclopedia 
 is fairly new, but there’s already a lot of information, and it’s constantly growing
 to cover more topics.

Javapedia is organized by topic (Technology, Products, Practice, and so on). It explains individual terms
 and provides links to sources that cover the subject in depth. As I mentioned 
 at the start, Javapedia keeps growing, as does the community
 helping to build it.