hey everyone, im having some troubles displaying the background image for a GUI interface in java. Here is what i have at the moment, and with current stage of code it shows default(gray) background.

import javax.swing.*;
import java.awt.event.*;
import java.util.Scanner;
import java.awt.*;
import java.io.File;
import javax.imageio.ImageIO;                    
import java.awt.image.BufferedImage;     
import java.io.IOException;  
    //////////////////////////////////
    //   3nriched Games Presents: //
    //     MIPS The Mouse!!  //
    //////////////////////////////////           


  public class mipsMouseGUI extends JFrame implements ActionListener
{

 private static String ThePDub = ("mouse"); //the password
 JPasswordField pass;
 JPanel panel;
 JButton btnEnter;
 JLabel lblpdub;

 public mipsMouseGUI()
 {
  BufferedImage image = null;

  try 
  { 
   //attempts to read picture from the folder
              image = ImageIO.read(getClass().getResource("/mousepics/mousepic.png"));
         } 
  catch (IOException e) 
  {  
   //catches exceptions
              e.printStackTrace();
         }

   ImagePanel panel = new ImagePanel(new ImageIcon("/mousepics/neonglowOnwill.png").getImage());


         setIconImage(image);  
  //sets icon  picture                  
  setTitle("Mips The Mouse Login");

  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


        pass = new JPasswordField(5);  //sets password length to 5   
  pass.setEchoChar('@');   //hide characters as @ symbol
  pass.addActionListener(this);    //adds action listener 

  add(panel);  //adds panel to frame
  btnEnter = new JButton("Enter"); //creates a button  
  btnEnter.addActionListener(this);// Register the action listener.

  lblpdub = new JLabel("       Your Password: "); // label that says enter password

  panel.add(lblpdub, BorderLayout.CENTER);//  adds label and inputbox 
  panel.add(pass, BorderLayout.CENTER); // to panel and sets location
  panel.add(btnEnter, BorderLayout.CENTER); //adds button to panel
  pack(); // packs controls and

  setLocationRelativeTo(null);    // Implicit "this" if inside JFrame constructor.

  setVisible(true);// makes them visible (duh)

 }

 public void actionPerformed(ActionEvent a)
 {

  Object source = a.getSource();
  //char array that holds password
  char[] passy = pass.getPassword();
  //characters array to string
  String p = new String(passy);

  //determines if user entered correct password
  if(p.equals(ThePDub))
  {
   JOptionPane.showMessageDialog(null, "Welcome beta user: USERNAME.");
  }
  else
   JOptionPane.showMessageDialog(null, "You have enter an incorrect password. Please try again.");
 }

 public class ImagePanel extends JPanel 
 {
  private BufferedImage img;

  public ImagePanel(String img) 
  {
   this(new ImageIcon(img).getImage());
  }

  public ImagePanel(Image img) 
  {

   Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));

    }

  public void paintComponent(Graphics g) 
  {
   g.drawImage(img, 0, 0, null);
    }

 }
}