I can\'t run the Maven Netbeans JavaFX example :
Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:exe
Try to run Maven from the command line or type "-X" in the text field - you can't break anything this way, at the worst, you'll get an error (I don't have Netbeans; in Eclipse, there is a checkbox "Debug" for this).
When running with debug output enabled, you should see the paths which the exec-maven-plugin plugin uses.
The next step would then be to copy the command into a command prompt or terminal and execute it manually to see if you get a useful error message there.