I'm using Solaris 10 both SPARC and x86, also using Fedora Core 5. I also tried
GTK look&feel on Swing Apps, e.g. NetBeans 5.0 IDE. It seems that Anti-Alias
does not work with these apps when I use GTK L&F and change my font setting of
Solaris JDS and GNOME on Fedora Core 5.

JDK1.5 works fine with swing.aatext=true.

1. Install IPA fonts
There is free TrueType fonts called IPA fonts, which can be downloaded
from https://sourceforge.jp/projects/opfc/. Fonts are included in
module tarball of "ModuleHP". Please contact me if you need fonts.

2. Install these fonts into JDS or GNOME
copy these font files to ~/.fonts
3. Change Desktop and App fonts to these fonts on setting dialog
Now you can see these fonts on GNOME apps
4. Try swingset2 with GTK Look&Feel in Japanese locale

Results are,

JDK1.5:
AA does not work at default option, but -Dswing.aatext=true can
solve this problem.

% java -Dswing.aatext=true SwingSet2.jar

AA now works.

Mustang (b81):
AA does not work. -Dswing.aatext=true also could not help.

I attached screenshot, it shows JDS menu, JDK1.5 swingset2 with aatext=true,
Mustang b81 swingset2.