FULL PRODUCT VERSION :
Java(TM) SE Runtime Environment (build 9-ea+122)

ADDITIONAL OS VERSION INFORMATION :
Mac OS X, 10.11.5 build: 15F34

A DESCRIPTION OF THE PROBLEM :
On macOS (Mac OS X) selecting a menu item with mouse, does not fire actionPerformed when menubar is a screen menu bar (Dapple.laf.useScreenMenuBar=true)
    
If a keystroke is assigned to the menu item, the action is fired when pressing the keystroke.
Using latest JDK8 this works.

REGRESSION. Last worked in version 8u92

ADDITIONAL REGRESSION INFORMATION:
it worked in JDK 8 versions
Java(TM) SE Runtime Environment (build 1.8.0_92-b14)


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a menubar in a JFrame that is a screenmenubar on macOS (-Dapple.laf.useScreenMenuBar=true)
Select an menu item with mouse.
Or use attached example.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Action of menuitem is fired.
ACTUAL -
Action of menuitem is not fired

ERROR MESSAGES/STACK TRACES THAT OCCUR :
no message

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;

import javax.swing.AbstractAction;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.KeyStroke;

/*
Synopsis:
    On macOS (Mac OS X) selecting a menu of screen menu bar item does not fire actionPerformed
Full OS version:
    Mac OS X, 10.11.5 build: 15F34
Additional Configuration Information:
    
Development Kit or Runtime version:
    Java(TM) SE Runtime Environment (build 9-ea+122)
    
Description:
    On macOS (Mac OS X) selecting a menu item with mouse, does not fire actionPerformed when
    menubar is a screen menu bar (-Dapple.laf.useScreenMenuBar=true)
    
    If a keystroke is assigned to the menu item, the action is fired when pressing the keystroke.
    Using latest JDK8 this works.
    
Steps to Reproduce:
    Create a menubar in a JFrame that is a screenmenubar on macOS (-Dapple.laf.useScreenMenuBar=true)
    Select an menu item with mouse.
    Or use attached example.
    
Expected Results:
    Action of menuitem is fired.
    
Actual Result:
    Action of menuitem is not fired
    
Frequency: Allways
Error Message: No message
Workarround: none
Severity: In screen menu bar menu items do not work!

 */
public class ScreenMenuBar
{
    
    
    private static void createAndShowGUI()
    {
        System.err.println("java.version: " + System.getProperty("java.runtime.version"));
        int shortcutKeyMask = Toolkit.getDefaultToolkit().getMenuShortcutKeyMask();
        
        JFrame frame = new JFrame("ScreenMenuBar");
        frame.setSize(300, 300);
        
        // create a menubar with one menu and one menu item
        JMenuBar mb = new JMenuBar();
        JMenu menu = new JMenu("Test");
        mb.add(menu);
        JMenuItem mi = new JMenuItem(new AbstractAction("A Menu Item")
        {
            @Override
            public void actionPerformed(ActionEvent arg0)
            {
                // show a message when action is fired
                JOptionPane.showMessageDialog(null, "Menu Item selected: \n" + arg0);
            }
        });
        // assign a keystroke
        mi.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, shortcutKeyMask));
        menu.add(mi);
        frame.setJMenuBar(mb);
        
        frame.setVisible(true);
    }
    
    public static void main(String[] args)
    {
        // on macOS show menubar as ScreenMenuBar
        System.setProperty("apple.laf.useScreenMenuBar", "true");
        
        javax.swing.SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowGUI();
            }
        });
    }
}

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

CUSTOMER SUBMITTED WORKAROUND :
no workaround