I snapped a picture of a GNOME menu overlayed on top of Netbeans, so Netbeans' complete failure to match the fonts of the GNOME desktop is made crystal clear: http://bit.ly/eSQy3d
The fix would be to roll our own matching ~/.fonts.conf or /etc/fonts/local.conf for all the non-GNOME applications.
Rather quickly you'll find that there are two tracks, one is to change the config/command line parameter to launch it (I believe it's: -J-Dswing.aatext=true), the other is to use the official Oracle JVM/JDK, and version 6, along with ensure Netbeans is launching with that (see JAVA_HOME). It has better font rendering/handling. I've done the former, but haven't bothered with the latter, as I prefer Fedora managing my packages.
I hope that helps.
sudo java -jar jpui.jar
and set that property under System. `jpui.jar` can be get from http://jpui.sourceforge.net/The other related property is `awt.useSystemAAFontSettings=on`