Java game not loading

[Justin_44]

I am not quite sure why I am getting this error

package tile;

import java.awt.Graphics2D;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import javax.imageio.ImageIO;

import main.GamePanel;
import main.UtilityTool;

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

    public TileManager(GamePanel gp) {

        this.gp = gp;

        tile = new Tile[42];
        mapTileNum = new int[gp.maxWorldCol][gp.maxWorldRow];

        getTileImage();
        loadMap("/maps/worldV2.txt");

    }
    public void getTileImage() {

            //Placeholder
            setup(0,"grass00", false);
            setup(1,"grass00", false);
            setup(2,"grass00", false);
            setup(3,"grass00", false);
            setup(4,"grass00", false);
            setup(5,"grass00", false);
            setup(6,"grass00", false);
            setup(7,"grass00", false);
            setup(8,"grass00", false);
            setup(9,"grass00", false); 
            setup(10,"grass00", false);
            setup(11,"grass01", false);
            setup(12,"water00", true);
            setup(13,"water01", true);
            setup(14,"water02", true);
            setup(15,"water03", true);
            setup(16,"water04", true);
            setup(17,"water05", true);
            setup(18,"water06", true);
            setup(19,"water07", true);
            setup(20,"water08", true);
            setup(21,"water09", true);
            setup(22,"water10", true);
            setup(23,"water11", true);
            setup(24,"water12", true);
            setup(25,"water13", true);
            setup(26,"road00", false);
            setup(27,"road01", false);
            setup(28,"road02", false);
            setup(29,"road03", false);
            setup(31,"road04", false);
            setup(32,"road05", false);
            setup(33,"road06", false);
            setup(34,"road07", false);
            setup(35,"road08", false);
            setup(36,"road09", false);
            setup(37,"road10", false);
            setup(38,"road11", false);
            setup(39,"road12", false);
            setup(40,"wall", true);
            setup(41,"tree", true);


    }
    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;
            int screenX = worldX - gp.player.worldX + gp.player.screenX;
            int 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, screenX, screenY, null);
            }

            worldcol++;

            if(worldcol == gp.maxWorldCol) {
                worldcol =0;
                worldrow ++;

            }
        }

    }
}





public void paintComponent(Graphics g) {
        super.paintComponent(g);

        Graphics2D g2 = (Graphics2D)g;

        tileM.draw(g2);

        for(int i = 0; i < obj.length; i++){
            if(obj[i] != null) {
                obj[i].draw(g2, this);
            }
        }

        player.draw(g2);

        g2.dispose();
    }

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: Cannot read field "image" because "this.tile[tileNum]" is null
at tile.TileManager.draw(TileManager.java:138)
at main.GamePanel.paintComponent(GamePanel.java:109)

[JamesCherrill]

The code you posted looks ok. Maybe the problem is in the GamePanel Class?
Maybe it’s this scenario…
A JPanel class adds some children and that triggers a repaint on the Swing thread. But the child’s constructor is still running on the main thread so it’s possibly not complete when the repaint runs. This is most probable when the child constructor does any I/O.

.UPDATE.

ignore the above. You didn’t call setup for index 30!

Ps. The empty catch block when trying to read files is a really good way to make any problems totally undebuggable.