Install JDK 5.0 U2 B03 on Solaris AMD.
Run demo from usr/jdk1.5.0_02/demo/jfc/SwingSet2/SwingSet2.jar (java -jar SwingsSet2.jar)
Change the Look and Feel to GTK Style. Error messages can be seen at the terminal..

/usr/share/themes/Crux/gtk-2.0/gtkrc:66: Failed to parse property value " GTK_SHADOW_NONE " for `GtkToolBar::shadow-type'
/usr/share/themes/Crux/gtk-2.0/gtkrc:402: Engine "crux-engine" is unsupported, ignoring
/usr/share/themes/Crux/gtk-2.0/gtkrc:418: Engine "crux-engine" is unsupported, ignoring
/usr/share/themes/Crux/gtk-2.0/gtkrc:439: Engine "crux-engine" is unsupported, ignoring
/usr/share/themes/Crux/gtk-2.0/gtkrc:453: Engine "crux-engine" is unsupported, ignoring
/usr/share/themes/Crux/gtk-2.0/gtkrc:466: Engine "crux-engine" is unsupported, ignoring
/usr/share/themes/Crux/gtk-2.0/gtkrc:479: Engine "crux-engine" is unsupported, ignoring
/usr/share/themes/Crux/gtk-2.0/gtkrc:495: Engine "crux-engine" is unsupported, ignoring

###@###.### 2004-11-17 19:42:57 GMT

Same error messages are also visible for Mustang b12..
###@###.### 2004-11-18 20:51:52 GMT