Ajuda, imagem de fundo em um JTextField

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.TexturePaint;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class WatermarkTextField extends JTextField {
  BufferedImage img;

  TexturePaint texture;

  public WatermarkTextField(File file)  {
    super();
    try {
      img = ImageIO.read(file);
    } catch (IOException e) {
      e.printStackTrace();
    }
    Rectangle rect = new Rectangle(0, 0, img.getWidth(null), img.getHeight(null));
    texture = new TexturePaint(img, rect);
    setOpaque(false);
  }

  public void paintComponent(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    g2.setPaint(texture);
    g.fillRect(0, 0, getWidth(), getHeight());
    super.paintComponent(g);
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
    JTextField textfield = new WatermarkTextField(new File("waterMarkImage.png"));
    textfield.setText("www.java2s.com");
    frame.getContentPane().add(textfield);
    frame.pack();
    frame.setVisible(true);
  }

}

final ImageIcon imageIcon = new ImageIcon("C:\\Trisha.gif");
        jTextArea1 = new javax.swing.JTextArea(){
            Image image = imageIcon.getImage();
            public void paint (Graphics g) {
                Graphics2D g2 = (Graphics2D) g;  
                g.drawImage(image, 0, 0,(int)this.getSize().getWidth(),(int)this.getSize().getHeight(), this); 

                super.paint (g);   
            } 
        };
        jTextArea1.setText("Hello");
        jScrollPane1.setViewportView(jTextArea1);