[gridlockd]

No it isn't!

Sure, you can run some sort of Java VM on a lot of platforms. That's no big distinction, you can say the same about Javascript, Python, Lua and so on.

Once you enter the realm of graphical applications, it's a clusterfuck, just like any other "cross-platform" thing.

[mrguyorama]

Does Swing not run pretty much the same on Mac, Linux, and Windows?

[gridlockd]

Yes, it sucks on all these platforms equally badly.