Волшебный пинок в правильном направлении

package zetcode;
 
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
 
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.SwingUtilities;
 
 
public class Example extends JFrame {
 
    public Example() {
        initUI();
    }
 
    public final void initUI() {
 
        JMenuBar menubar = new JMenuBar();
        ImageIcon icon = new ImageIcon(getClass().getResource("exit.png"));
 
        JMenu file = new JMenu("File");
        file.setMnemonic(KeyEvent.VK_F);
 
        JMenuItem eMenuItem = new JMenuItem("Exit", icon);
        eMenuItem.setMnemonic(KeyEvent.VK_C);
        eMenuItem.setToolTipText("Exit application");
        eMenuItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                System.exit(0);
            }
 
        });
 
        file.add(eMenuItem);
 
        menubar.add(file);
 
        setJMenuBar(menubar);
 
        setTitle("Simple menu");
        setSize(300, 200);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }
 
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                Example ex = new Example();
                ex.setVisible(true);
            }
        });
    }
}

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at javax.swing.ImageIcon.<init>(Unknown Source)
    at zetcode.Example.initUI(Example.java:24)
    at zetcode.Example.<init>(Example.java:18)
    at zetcode.Example$2.run(Example.java:54)
    at java.awt.event.InvocationEvent.dispatch(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$000(Unknown Source)
    at java.awt.EventQueue$1.run(Unknown Source)
    at java.awt.EventQueue$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

 ImageIcon icon = new ImageIcon(getClass().getResource("exit.png"));