ADDITIONAL SYSTEM INFORMATION :
java version "10.0.2" 2018-07-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode)

A DESCRIPTION OF THE PROBLEM :
An ActionListener that is invoked via an accelerator key is called twice. The same ActionListener invoked via the menu is called once.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
run program, use cmd-d

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
modifiers: 0, isSelected: true
ACTUAL -
modifiers: 4, isSelected: true
modifiers: 0, isSelected: false


---------- BEGIN SOURCE ----------
package com.bytezone.swing.bugs;

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class Bug001 extends JFrame
{
  final JMenuBar menuBar = new JMenuBar ();
  final JMenu fileMenu = new JMenu ("File");

  final JMenuItem debuggingItem = new JCheckBoxMenuItem ("Debugging");
  // final JMenuItem debuggingItem = new JMenuItem ("Debugging");

  public Bug001 ()
  {
    super ("Bug001");

    menuBar.add (fileMenu);
    fileMenu.add (debuggingItem);
    debuggingItem.setAccelerator (KeyStroke.getKeyStroke ("meta D"));
    setJMenuBar (menuBar);

    debuggingItem.addActionListener (new ActionListener ()
    {
      @Override
      public void actionPerformed (ActionEvent e)
      {
        System.out.printf ("modifiers: %d, isSelected: %s%n", e.getModifiers (),
            ((JMenuItem) e.getSource ()).isSelected ());
      }
    });
  }

  public static void main (String[] args)
  {
    EventQueue.invokeLater (new Runnable ()
    {
      @Override
      public void run ()
      {
        try
        {
          UIManager.setLookAndFeel (UIManager.getSystemLookAndFeelClassName ());
          System.setProperty ("apple.laf.useScreenMenuBar", "true");
          new Bug001 ().setVisible (true);
        }
        catch (Exception e)
        {
          e.printStackTrace ();
        }
      }
    });
  }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Don't use apple.laf.useScreenMenuBar or don't use JCheckBoxMenuItem.

FREQUENCY : always