Why are Images Not Displaying in My Eclipse Exported Runnable JAR?

Eclipse Exported Runnable JAR Not Displaying Images

When attempting to load images from a JAR file exported from Eclipse, users may encounter issues where the images fail to display.

To resolve this issue, ensure the following:

1. Image Resource Location:

Confirm that the images are properly packaged in a resource class package.

Alternatively, try creating an "images source folder" and placing the images there.

2. Image Loading Method:

Verify the image loading method used. The following methods have been successfully tested:

label.setIcon(new ImageIcon(MainFrame.class.getResource("/resources/header.jpg")));

URL url = getClass().getResource("/resources/header.jpg");
Image image = Toolkit.getDefaultToolkit().getImage(url);
label.setIcon(new ImageIcon(image));

try
{
    label.setIcon(new  ImageIcon(ImageIO.read(getClass().getResource("/resources/header.jpg"))));
}
catch (IOException e1)
{
    e1.printStackTrace();
}

3. Build Path Configuration:

If the resources are not directly in the source folder, ensure they are included in the build path:

Right-click the project and select "Build Path" > "Configure Build Path".

In the "Sources" tab, click "Add Folder" and navigate to the resources folder.

This will add the resources folder's contents to the build path.

4. Run Configuration:

When exporting as a runnable JAR, select the appropriate run configuration. This configuration should match the main class you are running in Eclipse.

5. Manifest File:

Ensure that the manifest file contains the following properties:

Rsrc-Class-Path: ./
Class-Path: .
Rsrc-Main-Class: <main class>
Main-Class: org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader</main>

Example:

The following example shows how to successfully load an image named "stackoverflow.png" from a resources folder:

File Structure:

- src
  - com.stackoverflow.test
    - Main.java
    - resources
      - stackoverflow.png

Code:

package com.stackoverflow.test;

import javax.swing.*;

public class Main {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            public void run() {
                URL url = Main.class.getResource("/resources/stackoverflow.png");
                ImageIcon icon = new ImageIcon(url);
                JFrame frame = new JFrame();
                frame.add(new JLabel(icon));
                frame.pack();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }
}

Export:

Right-click the project and select "Export" > "Runnable JAR File". Set up the appropriate launch configuration and export the JAR.

Result:

Running the exported JAR should display the "stackoverflow.png" image successfully.

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