Steps to reproduce in Windows:
-----------------------------
1. Run the following program.
2. Click "Alt+A". It does not work at all.

In Solaris, it is slightly better. "Alt+A" takes the user to next level. But that is it. Nothing works beyond that.

Tried and found happening in Windows2000, Windows98 and Solaris2.6.

Code used:
---------
import javax.swing.*;
import java.awt.event.*;

public class testMenu extends JFrame {
  public testMenu() {
    JMenuBar menuBar;
    JMenu menu, subMenu;
    JMenuItem menuItem;
    
    menuBar = new JMenuBar();
    setJMenuBar(menuBar);
    
    menu = new JMenu("First");
    menu.setMnemonic(KeyEvent.VK_F);
    menuBar.add(menu);
    
    menuItem = new JMenuItem("One", KeyEvent.VK_O);
    menu.add(menuItem);
    
    menu.addSeparator();
    subMenu = new JMenu("Subway");
    subMenu.setMnemonic(KeyEvent.VK_S);
    
    menuItem = new JMenuItem("Within subway", KeyEvent.VK_W);
    subMenu.add(menuItem);
    menu.add(subMenu);
  }
  
  public static void main(String args[]) {
    testMenu frame = new testMenu();
    
    frame.setTitle("testMenu");
    frame.pack();
    frame.setVisible(true);
  }
}