🚀 go-pugleaf

In javax.swing.Action, there was the addition of at least two new
constants:
Action.ACCELERATOR_KEY
Action.MNEMONIC_KEY

The documentation implies that these keys be used in preference to
manually
calling setMnemonic and setAccelerator in JMenuItem (though I'm not sure
whether this is really the case -- help me out here please.)

However, when I add an Action object which uses these new keys to a
JMenu via the add(Action) method, the graphical representation of the
menu item lacks the blue accelerator text it usually shows (Metal L&F),
the underlined mnemonic key isn't displayed, and the shortcut on the
action doesn't work.

This is bad karma, as it means I might have to manually use setMnemonic
and
setAccelerator still. :-(

Is there any other way around this?  Is it expected behaviour, even?