pourquoi ne reconnait il pas cette methode ?

CanvasApplet.java:41: cannot find symbol
symbol : method getDocumentBase()
location: class MyCanvas
this.theImage = this.getImage( this.getDocumentBase(), "portable.JPG" );

^
Note: DataStore.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
1 error
Voici mon code :

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 //The Canvas Applet that generates random colour circles
 
  import java.awt.*;
  import java.awt.event.*;
  import java.applet.*;
	import java.awt.Graphics;
import java.awt.Image;
 
  public class CanvasApplet extends Applet implements ActionListener
  {
 
    MyCanvas c;
 
    public void init()
    {
	Button b = new Button("Randomize!");
	b.addActionListener(this);
 
 
	c = new MyCanvas();
 
	this.setLayout(new BorderLayout());
	this.add("North", b);
	this.add("Center",this.c);
    }
 
    public void actionPerformed(ActionEvent e)
    {
	c.drawCircles();
    }
 
  }
 
 
  class MyCanvas extends Canvas
  {
     Color tempColor;
 	private Image theImage;
	    public void init()
    {
	this.theImage = this.getImage( this.getDocumentBase(), "portable.JPG" );
	}
 
     public void drawCircles()
     {
	this.repaint();
     }
 
     public void paint(Graphics g)
     {
	 g.drawImage( this.theImage, 10, 10, this);
 
	for(int i=0; i<200; i++)
	{
	  tempColor = new Color((float)Math.random(),(float)Math.random(),(float)Math.random());
	  g.setColor(tempColor);
	  g.drawOval((int)(Math.random()*200), (int)(Math.random()*200), 20, 20);
	}
     }
  }
J'ai inclus les bon package pourtatnt. Help !