"Not all requested modules can be enabled"

Java - Netbeans - JDK

JDK is needed for running some modules on Netbeans for Java.

And if you got a problem, try this : http://wiki.netbeans.org/FaqRunningOnJre
I prefer using this command :))

 --jdkhome command-line option e.g. ./bin/netbeans --jdkhome /usr/local/share/java/jdk1.6.0_07/