Load Buffered Image in Java

Question

My Game Class:

public class Game implements Runnable{

    .....
private BufferedImage test;

    private void initial(){
        test=ImageLoader.loadImage("/img/back.jpg");
    }
    ......
}

My ImageLoader Class:

public class ImageLoader {

    public static BufferedImage loadImage(String path){
        try {
            return ImageIO.read(ImageLoader.class.getClassLoader().getResource(path));
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(1);
        }
        return null;
    }
}

There is a img folder under res folder.

The error message:

Exception in thread "Thread-0" java.lang.IllegalArgumentException: input == null!
    at javax.imageio.ImageIO.read(Unknown Source)
    at ImageLoader.loadImage(ImageLoader.java:10)
    at Game.initial(Game.java:25)
    at Game.run(Game.java:49)
    at java.lang.Thread.run(Unknown Source)

I think it cant read the image but i didnt find alternative way.I want to read BufferedImage.

SOLUTION: Create a package and add the image in this package. And use package name.