I have a JFrame and couple of JMenu with one or two JMenuItems.
I have enabled Screen Magnifier and when I move mouse over the JMenu screen magnifier does not show the JMenu name where as JMenuItem are shown. I compared with native application and menu text are shown on screen magnifier.

Showing Menu will be very much useful for the user.

Step to reproduce:
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1) Enable Screen magnifier on theMac
System Preference -> Accessibility -> Zoom -> Select ( Enable Hover Text)
2) Run the attached test with -Djavax.accessibility.screen_magnifier_present=true option
3) Move the mouse over the "File" or "Edit" menu by pressing "cmd" button. If the screen magnifier does not show the menu name then the bug is reproduced.

I have attached the screen recording to demonstrate the same.