I just spotted this on Amazon.co.uk http://www.amazon.co.uk/Java-Nutshell-Benjamin-J-Evans/dp/1449370829/ It looks like a link to the 6th Edition of Java in a Nutshell, pretty cool news.
Here is a really interesting Java advent calendar with lots of interesting, technical articles: e.g. http://www.javaadvent.com/2013/12/mastering-java-bytecode.html http://www.javaadvent.com/2013/12/anatomy-of-java-decompiler.html http://www.javaadvent.com/2013/12/applying-forkjoin-from-optimal-to-fast.html