Loading image from .jar, Null Pointer Exception

Question

I'm running this code, and it's returning the following stack trace:

Uncaught error fetching image:
java.lang.NullPointerException
at sun.awt.image.URLImageSource.getConnection(URLImageSource.java:115)
at sun.awt.image.URLImageSource.getDecoder(URLImageSource.java:125)
at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:263)
at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:205)
at sun.awt.image.ImageFetcher.run(ImageFetcher.java:169)

I'm not sure where I made the mistake to output a Null Pointer exception. Tips on how to fix this?

import java.awt.BorderLayout;  
import java.awt.EventQueue;  
import java.awt.Graphics;  
import java.awt.Image;  
import java.awt.Toolkit;  
import javax.swing.JFrame;  
import javax.swing.JPanel;  
import javax.swing.border.EmptyBorder;  

public class MyFrame extends JFrame {  
     private JPanel contentPane;  

     public static void main(String[] args) {  
          EventQueue.invokeLater(new Runnable() {  
              public void run() {  
                    try {  
                         MyFrame frame = new MyFrame();  
              frame.setVisible(true);  
               } catch (Exception e) {  
                         e.printStackTrace();  
                   }  
               }  
        });  
     }   
   public MyFrame() {  
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
        setBounds(100, 100, 450, 300);  
        contentPane = new JPanel() {  
             public void paintComponent(Graphics g) {  
                  Image img = Toolkit.getDefaultToolkit().getImage(  
                           MyFrame.class.getResource("/images/Ella and Louis_front.jpg"));  
                 g.drawImage(img, 0, 0, this.getWidth(), this.getHeight(), this);  
             }  
        };  
       contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));  
        contentPane.setLayout(new BorderLayout(0, 0));  
        setContentPane(contentPane);         }

}

possible duplicate of What is a Null Pointer Exception, and how do I fix it? — Martijn Pieters
– Martijn Pieters, Commented Dec 14, 2014 at 0:12
When you get an EXCEPTION, or "error" please post the stack trace, which will tell us in which line the exception occurred. The stack trace is meant to make your life simpler. Post it here. — Erran Morad
– Erran Morad, Commented Dec 14, 2014 at 0:14
I answered the question, please reply if it helped/didn't help — Victor2748
– Victor2748, Commented Dec 14, 2014 at 0:19

Victor2748 · Accepted Answer · 2014-12-14 06:10:51Z

1

when getting a resource: MyFrame.class.getResource("/images/Ella and Louis_front.jpg") it returns a null, I suggest doing a check: I suggest doing a check:

URL url = MyFrame.class.getResource("/images/Ella and Louis_front.jpg")
if (url != null) {
    Image img = Toolkit.getDefaultToolkit().getImage(url);
}

edited Dec 14, 2014 at 6:10

answered Dec 14, 2014 at 0:16

Victor2748

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