用java渲染图像

你好，我正在尝试为我刚刚开始创建的游戏添加纹理，但我一直遇到错误，我只是想知道是否有人能帮忙。错误指向这个.java文件，代码如下。包com.mime.minefront.graphics；

import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
public class Texture {
public static Render floor = loadBitmap("textures.textures/floor.png");
public static Render loadBitmap(String fileName) {
    try {
        BufferedImage image = ImageIO.read(Texture.class.getResource(fileName));
        int width = image.getWidth();
        int height = image.getHeight();
        Render result = new Render(width, height);
        image.getRGB(0, 0, width, height, result.pixels, 0, width);
        return result;
    } catch (Exception e) {
        System.out.println("CRASH!");
        throw new RuntimeException(e);
    }
}
}

错误列表是.

 Exception in thread "Thread-2" java.lang.ExceptionInInitializerError
at com.mime.minefront.graphics.Render3D.floor(Render3D.java:42)
at com.mime.minefront.graphics.Screen.render(Screen.java:28)
at com.mime.minefront.Display.render(Display.java:144)
at com.mime.minefront.Display.run(Display.java:112)
at java.lang.Thread.run(Thread.java:724)
 Caused by: java.lang.RuntimeException: java.lang.IllegalArgumentException: input ==               null!
at com.mime.minefront.graphics.Texture.loadBitmap(Texture.java:20)
at com.mime.minefront.graphics.Texture.<clinit>(Texture.java:8)
... 5 more
Caused by: java.lang.IllegalArgumentException: input == null!
at javax.imageio.ImageIO.read(ImageIO.java:1388)
at com.mime.minefront.graphics.Texture.loadBitmap(Texture.java:12)
... 6 more