Project Valhalla
Check out the official page on Project Valhalla at http://openjdk.java.net/projects/valhalla/
Valhalla project aims to enhance Value Types, Generics and Volatiles.
$ hg clone http://hg.openjdk.java.net/valhalla/valhalla/ valhalla
$ cd valhalla
$ chmod u+x get_source.sh
$ ./get_source.sh
$ make jimages
Download JDK/JRE binaries for Project Valhalla, from the Adopt OpenJDK Cloudbees build farm.