Oracle changed their JDK 1.9 Early Access builds recently. Now the installed jdk reports its version as 9-ea instead of 1.9 used previously. This caused a problem with the JBDS installer: JBDS-3581

But even if I select jdk 1.8 in the installer and change jbdevstudio.ini to point to my 1.9 installation, JBDS won't start (I'm on Mac).
It just shows an error saying where to look for log. The log is linked here:
https://issues.jboss.org/secure/attachment/12396824/1453206771791.log

Upstream BZ: https://bugs.eclipse.org/bugs/show_bug.cgi?id=486213