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adamilardi
Release notes: http://java.sun.com/javase/6/webnotes/6u21.html
pohl
I noticed that a couple of items on the list were features that I thought would not arrive until JDK7: compressed 64-bit pointers, and the G1 garbage collector, for example.

http://en.wikipedia.org/wiki/Java_version_history#Java_SE_7....

oconnor0
I've ran into a few instances where Sun rewrote some fairly major subsystem (like their plugin architecture) on a point release. It's caused quite a few problems.
adamilardi
I'm really waiting for the dynamic language enhancements. They will be great!
riffraff
hey have been available as experimental options for quite a wile ( http://en.wikipedia.org/wiki/Java_version_history#Java_SE_6_... ), and at least for G1 they seem to still be.

I have the impression, reading the release notes, that compressed oops and escape analysis may be enabled by default now, but I'd be happy if someone could shed some light