Problème de null Pointer Exception sur le ContentPane d'une JApplet / JApplet Vide

Bonjour,

J'ai un problème avec ma JApplet.

Lorsque je la lance, elle ne semble pas capable d'ajouter des elements dans le ContentPane et ne semble meme pas le trouver.

Voici l'erreur que m'affiche la console :

Code:

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java.lang.NullPointerException
	at java.awt.Container.addImpl(Unknown Source)
	at java.awt.Container.add(Unknown Source)
	at appletcalendar.CalendarApplet.init(CalendarApplet.java:42)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Exception : java.lang.NullPointerException

Et voici le code ma JApplet :

Code:

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package appletcalendar;
 
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import com.toedter.calendar.JCalendar;
import java.net.URL;
import java.text.DateFormat;
import java.util.Date;
 
 
 
public class CalendarApplet extends JApplet implements ActionListener
{
 
    private javax.swing.JButton jButton1;
    private com.toedter.calendar.JCalendar jCalendar1;
 
    /** Initializes the applet CalendarApplet */
    @Override
    public void init()
    {
        jCalendar1 = new com.toedter.calendar.JCalendar();
        jCalendar1.setSize(new Dimension(50,50));
        jButton1 = new javax.swing.JButton();
        jButton1.setSize(new Dimension(50,50));
 
        // Liens d'ecoute
        jButton1.addActionListener(this);
 
        JPanel contentPane = new JPanel();
 
        contentPane.setLayout(new BorderLayout());
        contentPane.add(jCalendar1);
        contentPane.add(jButton1);
 
        this.setContentPane(contentPane);
 
    }
 
    // affichage
    @Override
    public void paint(Graphics g)
    {
        super.paint(g);
    }
 
    // methode qui reagit aux evenements
    public void actionPerformed (ActionEvent e)
    {
        repaint();
    }
 
    public void aller_au_jour()
    {
        try
        {
            /*Date date = this.jCalendar1.getDate();
 
            this.getAppletContext().showDocument(new URL("www.google.fr"));*/
 
            this.jCalendar1.setDate(new Date());
 
        }
        catch(Exception e)
        {
            System.out.println(e.getMessage());
        }
    }    
}

Merci d'avance.

package appletcalendar; import java.awt.*; import javax.swing.*; import java.awt.event.*; import com.toedter.calendar.JCalendar; import java.net.URL; import java.text.DateFormat; import java.util.Date; public class CalendarApplet extends JApplet implements ActionListener { private JCalendar jCalendar1; private JButton jButton1; /** Initializes the applet CalendarApplet */ @Override public void init() { jCalendar1 = new com.toedter.calendar.JCalendar(); jCalendar1.setSize(new Dimension(50,50)); jCalendar1.setVisible(true); jButton1 = new javax.swing.JButton(); jButton1.setSize(new Dimension(50,50)); jButton1.setVisible(true); jButton1.addActionListener(this); // Liens d'ecoute jButton1.addActionListener(this); JPanel contentPane = new JPanel(); contentPane.setLayout(new FlowLayout()); contentPane.add(jCalendar1); contentPane.add(jButton1); contentPane.setVisible(true); this.setContentPane(contentPane); this.setVisible(true); } // methode qui reagit aux evenements public void actionPerformed (ActionEvent e) { } public void aller_au_jour() { try { /*Date date = this.jCalendar1.getDate(); this.getAppletContext().showDocument(new URL("www.google.fr"));*/ this.jCalendar1.setDate(new Date()); } catch(Exception e) { System.out.println(e.getMessage()); } }