JTabbedPane insérer une icone sur l'onglet

bonjour a tous,

j'aimerai inserer une icone sur le premier ongletet le probleme c'est que il ne trouve pas l'image.
c'est une image en .png et j'aimerai savoir si c'est le format qu'il n'accepte pas car il me balance l'erreur du test de ma methode createImage(String path) :

couldn't find file: "+path

Voila ce que j'ai fait :
Code:
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package modeles;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.event.KeyEvent;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;



@SuppressWarnings("serial")
public class Fenetre extends JPanel {

	private JPanel jpa1, jpa2;
	private JLabel jla1, jla2;
	private JTextField login;
	private JPasswordField password;
	private JTabbedPane jtp;
	private JButton bvalider;
	private ImageIcon icon;

	public Fenetre() {
		super(new BorderLayout());
		
		jtp = new JTabbedPane(JTabbedPane.TOP);
		icon = (ImageIcon) createImage("C:/Users/Oukna/Desktop/worskpaceTP/DiabetoMedical/connect.png");
		
		JComponent p1 = makeTextPanel("Connexion");
		//jtp.setMnemonicAt(1, KeyEvent.VK_1);
		
		jpa1 = new JPanel();
		jpa1.setLayout(new GridLayout(2,2));
		jpa2 = new JPanel();
		jpa2.setLayout(new FlowLayout());
		
		jla1 = new JLabel("Login: ");
		jla2 = new JLabel("Password: ");
		login = new JTextField(10);
		password = new JPasswordField(10);
		bvalider = new JButton("Submit");
		jpa1.add(jla1);
		jpa1.add(login);
		jpa1.add(jla2);
		jpa1.add(password);
		jpa2.add(jpa1);
		jpa2.add(bvalider);
		
		p1.add(jpa2);
		jtp.addTab("Connexion", icon,p1);
		
		bvalider.addActionListener(new Ecouteur(1));
		//login.addActionListener(new Ecouteur(2));
		//password.addActionListener(new Ecouteur(2));
		
		
		//add the tabbedpane to this panel
		add(jtp);
		
		//the following line enables to use scrolling tabs
		jtp.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);
		
	}
	protected JComponent makeTextPanel(String text) {
		JPanel panel = new JPanel(false);
		JLabel filler = new JLabel(text);
		filler.setHorizontalAlignment(JLabel.CENTER);
		panel.setLayout(new GridLayout(1, 1));
		panel.add(filler);
		return panel;
	}
	/** Returns an ImageIcon or null if the path was invalid.*/
	protected static ImageIcon createImage(String path) {
		java.net.URL imgURL = Fenetre.class.getResource(path);
		if(imgURL != null){
			return new ImageIcon(imgURL);
		}else{
		System.err.println("couldn't find file: "+path);
		return null;
	}
	}
	/**Create the GUI and show it. For thread safety.
	 * this method should be invoked from
	 * the event dispatch thread.
	 */
	private static void createAndShowGUI(){
		//create and set up the window
		JFrame frame = new JFrame("DiabetoMédical");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		//Add content ti the window.
		frame.add(new Fenetre(), BorderLayout.CENTER);
		
		//Display the window
		frame.pack();
		frame.setVisible(true);
	}
	public static void main(String[] args) {
        //Schedule a job for the event dispatch thread:
        //creating and showing this application's GUI.
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                //Turn off metal's use of bold fonts
		UIManager.put("swing.boldMetal", Boolean.FALSE);
		createAndShowGUI();
            }
        });
    }
merci