Please help me, input == null!

[Hoàng_32]

Here is my code:

package com.Main.tile;

import com.Main.GamePanel;
import com.Main.UtilityTool;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class TileManager {
    GamePanel gp;
    public Tile[] tile;
    public int mapTileNum[] [];

    public TileManager(GamePanel gp){
        this.gp = gp;
        tile = new Tile[10];
        mapTileNum = new int [gp.maxWorldCol] [gp.maxWorldRow];

        getTileImage();
        loadMap("/maps/world01.txt");
    }
    public void getTileImage(){

            setup(0, "grass", false);
            setup(0, "wall", true);
            setup(0, "water01", true);
            setup(0, "earth", false);
            setup(0, "tree", true);
            setup(0, "sand", false);

    }

    public void setup(int index, String imageName, boolean collision){

        UtilityTool uTool = new UtilityTool();

        try {
            tile[index] = new Tile();
            tile[index].image = ImageIO.read(getClass().getResourceAsStream("/tiles/"+imageName+".png"));
            tile[index].image = uTool.scaleImage(tile[index].image, gp.tileSize, gp.tileSize);
            tile[index].collision = collision;

        } catch (IOException e){
            e.printStackTrace();
        }
    }
    public void loadMap(String filePath){
        try{
            InputStream is = getClass().getResourceAsStream(filePath);
            BufferedReader br = new BufferedReader(new InputStreamReader(is));

            int col = 0;
            int row = 0;

            while(col < gp.maxWorldCol && row < gp.maxWorldRow){
                String line = br.readLine();
                while(col < gp.maxWorldCol){
                    String numbers[] = line.split(" ");

                    int num = Integer.parseInt(numbers[col]);
                    mapTileNum[col] [row] = num;
                    col++;
                }
                if(col == gp.maxWorldCol){
                    col = 0;
                    row++;
                }
            }
            br.close();
        }catch(Exception e){

        }
    }
    public void draw(Graphics2D g2){
        int worldCol = 0;
        int worldRow = 0;

        while(worldCol < gp.maxWorldCol && worldRow < gp.maxWorldRow){
            int tileNum = mapTileNum[worldCol] [worldRow];

            int worldX = worldCol * gp.tileSize;
            int worldY = worldRow * gp.tileSize;
            double screenX = worldX - gp.player.worldX + gp.player.screenX;
            double screenY = worldY - gp.player.worldY + gp.player.screenY;

            if(worldX + gp.tileSize > gp.player.worldX - gp.player.screenX &&
               worldX - gp.tileSize < gp.player.worldX + gp.player.screenX &&
               worldY + gp.tileSize > gp.player.worldY - gp.player.screenY &&
               worldY - gp.tileSize < gp.player.worldY + gp.player.screenY) {
                g2.drawImage(tile[tileNum].image, (int)screenX, (int)screenY, null);
            }
            worldCol++;
            //x += gp.tileSize; DISABLE FOR STABILITY
            if(worldCol == gp.maxWorldCol){
                worldCol = 0;
                //x = 0;
                worldRow++;
                //y += gp.tileSize;

            }
        }
    }
}

and it always shows the error:

Exception in thread "main" java.lang.IllegalArgumentException: input == null!
at java.desktop/javax.imageio.ImageIO.read(ImageIO.java:1358)
at com.Main.tile.TileManager.setup(TileManager.java:44)
at com.Main.tile.TileManager.getTileImage(TileManager.java:29)
at com.Main.tile.TileManager.<init>(TileManager.java:24)
at com.Main.GamePanel.<init>(GamePanel.java:30)
at com.Main.Main.main(Main.java:13)

[gce517]

My experience with Java is limited, but I have encountered this several times.

"input == null" means that the file requested in line 44 of your code snippet could not be found. This could be due to several factors, such as case-sensitive file names, the wrong path, or the file simply doesn't exist.

Hope this helps!