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Since 'J' in _J_ackport is already used in editor it cannot be used most of the user's time spent in the IDE. You may consider either Jack_p_ot or Jackp_o_t which seems to be unused nither by editor, global actions nor as other mnemonic among menu items. Probably P4, for shortcut-addictive P3 :). Workaround exist: Alt+b, j.
....Alt-j is used for select identifier in the editor
The editor is violating the Java Look & Feel Design Guidelines, and GNOME accessibility rules, by declaring shortcuts using the ALT key. NetBeans can't violate L&F rules just because Emacs did, especially since Emacs was created before windowing systems were widely available. Besides, doesn't having so many ALT shortcuts prevent other locales from having standard mnemonics? But it doesn't matter for this case, since I'm working with the UI team on eliminating or at least renaming the Jackpot menu. I will make sure that its mnemonics don't clash with existing uses. In the meantime, on Windows you can hit and release ALT to select the menu bar, then hit J.