Seriously, perhaps Apple is trying to discourage people from developing MacOS applications using Java in order not to make the whole experience appear slow. Their OS is already quite inefficient (which, BTW, makes me wonder why on earth anybody would make a Mac their development machine).
Macs make good development machines if your production machines are also UNIX based. Even if my code is truly platform-independent, I still find it easier when I don't have to mentally switch back and forth between windows and unix. Of course, I also find Unix to be a much more powerful environment. That said, I also haven't found speed to be a problem on my mac (it is slower than the windows laptop that my work gave me, but it's also an older machine).
Of course, this only addresses Mac vs Windows - the argument becomes less compelling if you're comparing it to linux. I'm not sophisticated enough with Unix to appreciate the differences between linux and bsd, but I do like the Mac UI, and unlike windows, I get a unix prompt, which is pretty tremendous.
Seriously, perhaps Apple is trying to discourage people from developing MacOS applications using Java in order not to make the whole experience appear slow. Their OS is already quite inefficient (which, BTW, makes me wonder why on earth anybody would make a Mac their development machine).