Thanks gitman. No references to aliasing in the driver manual.
I'm getting empty gray windows for all the Java apps (Java 1.7). Applets run fine, and Java apps actually load, but all windows are just grey boxes.
One of many suggestions on the Java website is to turn off the video driver anti-aliasing. The problem must be video card related, as I have the exact same setup on another Fedora box, but with a different video card. On that machine Java apps run perfectly.