Thread: png problem continued

this is the error i get when i try to run the application.Any Suggestions? I appreciate all help thank you!

import java.awt.*;
import java.util.*;
import javax.swing.*;
import java.net.*;
import java.awt.geom.*;

public class DrawImage extends JFrame
{
private Image image;

public static void main(String[] args)
{
new DrawImage();
}

public DrawImage()
{
super("DrawImage");
setSize(600,600);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Toolkit tk = Toolkit.getDefaultToolkit();
image=tk.getImage(getURL("castle.png"));
}

private URL getURL(String filename)
{
URL url=null;
try
{
url=this.getClass().getResource(filename);
}

catch(NullPointerException e)
{
}


return url;
}
public void paint(Graphics g)
{
Graphics2D g2d = (Graphics2D)g;

g2d.setColor(Color.BLACK);
g2d.fillRect(0,0,getSize().width,getSize().height) ;

g2d.drawImage(image,0,40,this);
}
}










Uncaught error fetching image:
java.lang.NullPointerException
at sun.awt.image.URLImageSource.getConnection(URLImag eSource.java:115)
at sun.awt.image.URLImageSource.getDecoder(URLImageSo urce.java:125)
at sun.awt.image.InputStreamImageSource.doFetch(Input StreamImageSource.java:263)
at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher. java:205)
at sun.awt.image.ImageFetcher.run(ImageFetcher.java:1 69)

i started a new one because i didnt have the errors on there and i wanted people to see the code and the errors. The code is written out of a book and should work perfectly fine it is word for word. And i dont think the book was published with errors. thats why im confused why it doesnt work. As for the exceptions I do catch them and do something with them but in this case it wasnt necessary because i was copying it from the book Java SE 6 Game Programming. I appreciate the help but can you give me an answer that i can help me figure it out?

I tried the stackTrace() the errors that i have up in the code are the only thing the IDE shows me as errors

thanks man thats what i think too