[jtheory]

I've done my share of Java GUI programming (and still have Java applets running on a fairly active site... I can't replace them -- HTML5 and Flash aren't likely to support MIDI input, ever), and the "write once run anywhere" flaws are generally all in GUI programming.

But I think everyone has known for a long time now; that's not Java's sweet spot. It's do-able, but for obvious reasons it's harder to do cross-platform, and they made a few large missteps along the way trying to crack that particular nut.

Nowadays the vast majority of my Java work is server-side, and it all runs anywhere, without a hitch. The last time I had cross-platform Java issues with server-side code was on an AS/400.