Write-once-run-anywhere. Ha. Hahahahaha.
A bit of background, for the people in the audience who aren't familiar with Java: essentially, one of Sun's early marketing promises about Java was that you could write code once and run it on every computer on the planet, with Sun taking care of the tricky parts of actually talking to hardware. (This technique's called a 'virtual machine', in case you care.)
The problem is, it doesn't work. The abstraction leaks.
Not that this is actually news or anything -- I just felt like pointing it out.