加载图像的非法参数异常

Question

我正在编写游戏并尝试从ImageLoader类加载和映像，并且我一直收到此错误：

Exception in thread "main" java.lang.IllegalArgumentException: input == null!
at javax.imageio.ImageIO.read(ImageIO.java:1338)
at game.ImageLoader.getImage(ImageLoader.java:24)
at game.TestPanel.<init>(TestPanel.java:38)
at game.TestApplication.main(TestApplication.java:26)

以下是我的类调用ImageLoader类的代码，但我的catch块也收到错误：

    public TestPanel ()
        {
        try
        {
            ClassLoader myLoader = this.getClass().getClassLoader();
            ImageLoader loader = new ImageLoader();
            backdrop = loader.getImage("resources/Asteroid.jpg");
            ImageLoader test = new ImageLoader();
            ship = test.getImage("resources/Alien-Ship.png");
            InputStream pointStream = myLoader.getResourceAsStream("resources/path_1.txt");
            Scanner s = new Scanner (pointStream);
            objectPath = new PathPoints(s);
            squid = objectPath.getStart();


        }
        catch (IOException e)
        {
            System.out.println ("Could not load: " + e);
        }
        addMouseListener(this);
    }

以下是我的ImageLoader课程的代码：

    import java.awt.Image;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.Scanner;

    import javax.imageio.ImageIO;

    public class ImageLoader {

    public Image loadedImage;

        public ImageLoader(){


        }

        public Image getImage(String s){
        try
                {
                    ClassLoader myLoader = this.getClass().getClassLoader();
                    InputStream imageStream = myLoader.getResourceAsStream(s);
                    loadedImage = ImageIO.read(imageStream);
                }
                catch (IOException e)
                {
                    System.out.println ("Could not load: " + e);
                }

                return loadedImage;
         }

        }

为什么它会抛出空！我试图将resources/Asteroid.jpg的路径改为/resources/Asteroid.jpg但它没有改变任何内容。

编辑：resources与我的类路径有关，因为它是我存储图像和指向资源的包。