A DESCRIPTION OF THE PROBLEM :
After applying setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT) to the JMenuBar the arrow keys started to behave the opposite of what expected. Right arrow goes left and Left arrow goes right when trying to traverse through keyboard. Note that I'm using Native look and feel.

Here is the code:

import java.awt.BorderLayout;
import java.awt.ComponentOrientation;
import java.awt.Dimension;
import java.awt.Toolkit;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;

@SuppressWarnings("serial")
public class MenuBarProblem extends JFrame {
        
    private JMenuBar menuBar;
    
    private JMenu firstMenu;
    private JMenuItem a;
    private JMenuItem b;
    
    private JMenu secondMenu;
    private JMenuItem c;
    private JMenuItem d;
    
    private JMenu thirdMenu;
    private JMenuItem e;
    private JMenuItem f;
    
    public MenuBarProblem() {
        this.setLayout(new BorderLayout());
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        this.setExtendedState(JFrame.MAXIMIZED_BOTH);
        this.setSize(screenSize);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        this.firstMenu = new JMenu("first");
        this.a = new JMenuItem("a");
        this.b = new JMenuItem("b");
        this.firstMenu.add(this.a);
        this.firstMenu.add(this.b);
        
        this.secondMenu = new JMenu("second");
        this.c = new JMenuItem("c");
        this.d = new JMenuItem("d");
        this.secondMenu.add(this.c);
        this.secondMenu.add(this.d);
        
        this.thirdMenu = new JMenu("third");
        this.e = new JMenuItem("e");
        this.f = new JMenuItem("f");
        this.thirdMenu.add(this.e);
        this.thirdMenu.add(this.f);
        
        this.menuBar = new JMenuBar();
        this.menuBar.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT); //Here is the reason
        this.menuBar.add(this.firstMenu);
        this.menuBar.add(this.secondMenu);
        this.menuBar.add(this.thirdMenu);
        this.setJMenuBar(this.menuBar);
    }

}


FREQUENCY : always