setIconImage intellij Project javax.swing

Question

i'm heaving a problem in setting the icon for my swing project in intellij.

I tried this

iconpath = execPath + File.separator +  "images" + File.separator + "icon.png";

this.setIconImage(new ImageIcon(getClass().getResource(iconpath)).getImage());

but got

java.lang.ExceptionInInitializerError
Caused by: java.lang.NullPointerException
    at javax.swing.ImageIcon.<init>(ImageIcon.java:217)
    at cgui.FormApp.<init>(FormApp.java:52)
    at controller.Main.<clinit>(Main.java:39)
Exception in thread "main"

and

iconpath = execPath + File.separator +  "images" + File.separator + "icon.png";
InputStream resource = getClass().getResourceAsStream(iconpath);

Image image = null;
try {
      image = ImageIO.read(resource);
} catch (IOException e) {
  e.printStackTrace();
}
this.setIconImage(new ImageIcon(image).getImage());

and got

java.lang.ExceptionInInitializerError
Caused by: java.lang.IllegalArgumentException: input == null!
    at javax.imageio.ImageIO.read(ImageIO.java:1348)
    at cgui.FormApp.<init>(FormApp.java:58)
    at controller.Main.<clinit>(Main.java:39)
Exception in thread "main" 

I have my project structured like. Do you guys have any idea to how make this work?

Answer 1

You get the image path relative to Main.java.

You should get the image from the absolute path with getClassLoader() .

this.setIconImage(new ImageIcon(getClass().getClassLoader().getResource("images/icon.png")).getImage());