This was spotted by Fred: When he tried to install JBDS and selected Oracle JDK 1.8.0, he got: "JBoss Developer Studio does not work with selected version of java."
It was on Windows and I managed to reproduced it there, but it is probably not limited to Windows. It works fine with Oracle JDK 1.8.0_05. So the key here is that this is the original 1.8.0 release.
Fred suspects that this commit broke this: