Having trouble loading image to screen

Question

I am making a game and I am stuck trying to get the image to screen. I states that-

java.lang.IllegalArgumentException: input == null!
    at javax.imageio.ImageIO.read(Unknown Source)

I am sure that my image path is the right path, but it keeps stating that it's not.

background = new Background("C:/hello/flappybird.png");

The "debug" section of my workspace states that there is a problem with

background.render(g);

specifically, with

g.drawImage(img,(int)x,(int)y,null);

and I have no idea why it is doing this. I am 100% sure my build path is right!

EDIT: just incase you want to know the constructor of the background class:

public Background(String s) {

      try {
        img = ImageIO.read(this.getClass().getResource(s));
    } catch (IOException e) {
        e.printStackTrace();
    }

    }

Answer 1

I have found a solution!

it seems that in gamePanel, after I declared my BufferedImage, I forgot to add-

Graphics g = image.getGraphics();

sorry guys, I feel so stupid XD

Answer 2

This error indicates the image file wasn't found. To be sure that this is really the case, I urge you to execute ImageIO.read() directly and check the result:

BufferedImage icon = ImageIO.read("C:/hello/flappybird.png");

Also, it's not a good practice to use resources outside the classpath. I strongly suggest you to change your class Background to use classpath resources. Somewhere inside your Background class, you could add:

public class Background {

    public Background(String filename) {
        // Some code here
        BufferedImage image = ImageIO.read(getClass().getResource("/resources/images/" + filename));
        // More code here
    }
}