http://openjdk.java.net/projects/graal/
Jaroslav Tulach is the founder and initial architect of NetBeans, which is not just a well known IDE, but also the first modular desktop application framework written in Java. I have seen, made and helped to recover from many API design mistakes. Such experiences forced me to write a book titled “Practical API Design”. These days I am helping OracleLabs to design the API of Truffle which is the fastest virtual machine on the planet.