G1

 A lot of article deals with Hotspot, but since JDK 1.7 u4 i would say that most of those information are deprecated because of G1


What is behind G1 ?

a long presentation made by Charly Hunt one of the hotspot Guru
http://www.infoq.com/presentations/java-g1

and a smaller reading still on infoQ
http://www.infoq.com/articles/G1-One-Garbage-Collector-To-Rule-Them-All

this article has been followed by  a tunic tips
http://www.infoq.com/articles/tuning-tips-G1-GC