Drawing the contents of JPanel into an image file

Question

I have the following code and it generates a jpg file but for some reason its not working (i open the jpg file with microsoft paint and i see nothing):
JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.setPreferredSize(new Dimension(700, 500));
panel.add(webBrowser, BorderLayout.CENTER);  //WebBrowser is a subclass of JPanel
BufferedImage img = new BufferedImage(1500, 1500, BufferedImage.TYPE_INT_RGB);
panel.paint(img.getGraphics());
try{
     JPEGImageEncoder enc = JPEGCodec.createJPEGEncoder(new FileOutputStream("c:\\haha.jpg"));  
}catch(FileNotFoundException ex) {
    System.out.println(ex.getMessage());
}So what's wrong ?? why its not writing the output file correctly ??

Answer 1

Got it ...i just forgot the 3rd line:
fos = new FileOutputStream("c:\\majjooo.jpg");
JPEGImageEncoder enc = JPEGCodec.createJPEGEncoder(fos);
enc.encode(img);but am still having a problem is that the picture is black ...eventhough the panel has contents and i can see it but the picture has nothing but pitch black ...what do you think ??