I installed NetBeans 7.2 under my Ubuntu 12.04. And to invoke javadoc, I press the HOT KEY Alt+F1 when mouse is on the word, but it will only trigger Ubuntu's Applications menu on the top-left corner of my desktop (Gnome). How to solve the conflict issue?
Pressing Ctrl-Space at the end of a class or variable name will also show JavaDoc in NetBeans. Alternatively, you can change or disable the Gnome shortcut, or change the NetBeans shortcut.