Erik Helin

Much has happened in the last year for developers contributing to OpenJDK: - the repositories have been consolidated into a single repository - the run-test make target has been introduced - the JTReg (and jcov, asmtools and jtharness) build have been greatly improved - there is now a binary build of OpenJDK that can be used as --boot-jdk (on Linux x86-64)

The situation for HotSpot developers has also improved over the years: - the HotSpot build system was converted to the "new" build system - a proper unit test framework for C++ code (googletest) was added - debug symbols are no longer zipped by default - the JDK and HotSpot JTReg testlibraries were combined into one

This talk will show how all these changes make the OpenJDK developer experience a lot smoother. The speakers will also share their personal tips and tricks on how to work even faster on OpenJDK!

We also realize that the OpenJDK developer experience is far from optimal, and would therefore like this talk to initiate a discussion on what could be improved and how people can get involved.

The G1 garbage collector is currently proposed to become the default garbage collector in JDK 9. Recently three new ideas for G1 were described on the hotspot-gc-dev at openjdk.java.net mailing list: - parallel full GC - throughput write barriers - rebuilding remembered sets during concurrent mark

This talk will present these three new ideas so that people who are interested in getting into G1 development know where to start, see what the existing code looks like today and highlight how one can contribute (it is not only about code!).

The presentation can be made longer if people want to dive deeper into the details (but it can also fit in a 25 minute slot).