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Editorial Team
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Asked: 2026-05-27T04:59:20+00:00

I’m creating a Java application in NetBeans, and I have the following code that

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I’m creating a Java application in NetBeans, and I have the following code that sometimes gets called after a button click to put a provided image and string onto a JLabel that was placed in the GUI Builder:

helpLabel.setIcon(new ImageIcon("/bepe/resources/" + e.imageFile));
helpLabel.setText(e.getMessage());

The images are located in the sub-directory “resources”, which is in the same location as the files for the program. The label’s text is set as expected, but the image does not appear. If I set an image ahead of time in the GUI Builder, the image shows up. The generated code for that is 

helpLabel.setIcon(new javax.swing.ImageIcon(getClass().getResource("/bepe/resources/orIntro.png")));

But when I try to set the icon in the same way, I get a run-time error. Is there something wrong with the way I’m setting the image?

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1 Answer

  1. Editorial Team

    This declaration presumes the image is on the run-time class-path of the application, and accesses it by URL. This is the way to access a resource in a Jar.

    helpLabel.setIcon(new javax.swing.ImageIcon(getClass().getResource("/bepe/resources/orIntro.png")));

    This declaration presumes the String argument represents a File path. It will not work for an ‘application resource’ that is (presumably) in a Jar.

    helpLabel.setIcon(new ImageIcon("/bepe/resources/" + e.imageFile));

    Use getResource consistently, and make sure the image is on the run-time class-path.

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