Just to add to Chris and Erik's mails, I would encourage everyone that pushes to jdk9/dev or the other jdk9 project integration forests to clone and build jigsaw/stage and get familiar with the proposed layout, new build targets, and the very different output emitted during the build. The changes are arguably as significant as the transition in JDK 8 from the "old build" to the "new build" so the more people taking the forest for a test drive the better. If you maintain your our own own IDE project then you'll likely have to adjust file paths so any issues encountered would be useful to hear about too.
-Alan.
