Consider the following code fragment:

JMenuItem addMenuItem = new JMenuItem("Add");
addMenuItem.setMnemonis(KeyEvent.VK_A);
addMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_INSERT,
                                                  Event.ALT_MASK));

editMenu.add(addMenuItem);

The intent here is that A is the mnemonic, while Alt+Insert is the
menu accelator. Thus in the menu, A (of Add) should be underlined and
the menu item should look like "A_dd Alt+Insert".

The bug is that A of Alt also gets underlined. That is the menu item
looks like "A_dd A_lt+Insert"

This is causing confusion for the application users.