If you use Netbeans on Mavericks, and updated to Beta 6 (Build 13A558) you may have noticed your menu bar items fail to appear, looking something like this:

This comes from the default Java menu bar nib files being accidently removed from the build: /System/Library/Frameworks/JavaVM.framework/Versions/A/Resources/*.lproj/DefaultApp.nib

The workaround is to install the full Java SE 6 JDK from http://support.apple.com/kb/DL1572. This reinstalls the Java SDK in the correct locations, and will be deleted on the next Mavericks update (so there’s no harm in this temporary fix.)