Mine

package main;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;


public class MainView extends javax.swing.JPanel {
    private Image img;
   
    public MainView() {
        try {
            initComponents();
            img = ImageIO.read(new File("a.jpg"));
      
        } catch (IOException ex) {
            Logger.getLogger(MainView.class.getName()).log(Level.SEVERE, null, ex);
        }
        this.repaint();
        
    
    }
   public void paint(Graphics g) {

        g.drawImage(img, 0, 0, null);
    }
 
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        canvas1 = new java.awt.Canvas();

        setName("Form"); // NOI18N
        setLayout(new java.awt.BorderLayout());

        canvas1.setName("canvas1"); // NOI18N
        add(canvas1, java.awt.BorderLayout.CENTER);
    }// </editor-fold>                        
    // Variables declaration - do not modify                     
    private java.awt.Canvas canvas1;
    // End of variables declaration                   


}