Java Game engine Problem

[Lpokimo]

So I have A Error that I cant fix

Error{
Exception in thread "main" java.lang.NullPointerException
	at com.tbge.engine.Input.<init>(Input.java:32)
	at com.tbge.engine.GameContainer.start(GameContainer.java:26)
	at com.tbge.engine.GameContainer.main(GameContainer.java:124)
}

Line 32{
	public Input(GameContainer gc) {
        this.gc = gc;
        this.mouseX = 0;
        this.mouseY = 0;
        this.scroll = 0;

        gc.getWindow().getCanvas().addKeyListener(this); ( And THIS)
        gc.getWindow().getCanvas().addMouseListener(this); (THIS)
        gc.getWindow().getCanvas().addMouseMotionListener(this); (THIS)
        gc.getWindow().getCanvas().addMouseWheelListener(this);  (THIS)


        for (int i = 0; i < keys.length; i++) {
            keys[i] = false;
        }

		
		for(int i  = 0; i < NUM_BUTTONS; i++) {
			buttonslast[i] = buttons[i];
		}

}

Line 26{
	public void start() 
	{
		input = new Input(null); (This is the problem )
		window = new Window(this);
		renderer = new Renderer(this);
		
		thread = new Thread(this);
		thread.run();
	}
}

Line 124{

	public static void main(String args[])
	{
		GameContainer gc = new GameContainer();
		gc.start(); (This is the problem)
	}

}

If you can Help Thank you

[avan]

@Lpokimo said in Java Game engine Problem:

public Input(GameContainer gc) {

public Input(GameContainer gc) {

You provide it with a null argument so

gc.getWindow().getCanvas().addKeyListener(this); ( And THIS)

or any other reference to gc will produce an error because gc is null and therefore you cannot reference any methods or attributes.

I hope that makes sense. Please let me know.

[Lpokimo]

I Only have one question

How would I get this to work

[avan]

I would need to see the GameContainer class.

[Lpokimo]

package com.tbge.engine;

import java.awt.event.KeyEvent;

public class GameContainer implements Runnable
{
	private Thread thread;
	private Window window;
	private Renderer renderer;
	private Input input;
	private boolean running = false;
	private final double UPDATE_CAP = 1.0/60;
	private int width = 320, height = 240;
	private float scale = 3f;
	private String title = "TBGE Alpha 1";
	
	
	
	public GameContainer()
	{	
	
	}
	
	public void start() 
	{
		input = new Input(this);
		window = new Window(this);
		renderer = new Renderer(this);
		
		thread = new Thread(this);
		thread.run();
	}
	
	public void stop()
	{
		
	}
	
	public void run()
	{
		running = true;
		
		boolean render = false;
		double firstTime = 0;
		double lastTime = System.nanoTime() / 1000000000.0;
		double passedTime = 0;
		double unprocessedTime = 0;
		
		double frameTime = 0;
		int frames = 0;
		@SuppressWarnings("unused")
		int fps = 0;
		
		while(running)
		{
			render = false;
			
			firstTime = System.nanoTime() / 1000000000.0;
			passedTime = firstTime - lastTime;
			lastTime = firstTime;
			
			unprocessedTime += passedTime;
			frameTime += passedTime;
			
			while(unprocessedTime >= UPDATE_CAP) {
				
				unprocessedTime -= UPDATE_CAP;
				render = true;
				
				
				//TODO Update Game
				if(input.isKey(KeyEvent.VK_A))
				{
					System.out.println("YOU PRESSED A");
				}
				
				
				
				if(frameTime >= 1.0)
				{
					frameTime = 0;
					fps = frames;
					frames = 0;
					
					
					
				}
			}
			
			if(render)
			{
				renderer.clear();
				//TODO render game
				
				
				window.update();
				frames++;
			}
			
			else
			{
			try {
					Thread.sleep(1);
				} 
				catch (InterruptedException e) 
				{
					e.printStackTrace();
				}
			}
		}
		
		dispose();
	}
	
	@SuppressWarnings("unused")
	private void dispose()
	{
		
	}
	
	public static void main(String args[])
	{
		GameContainer gc = new GameContainer();
		gc.start();
	}

	public int getWidth() {
		return width;
	}

	public void setWidth(int width) {
		this.width = width;
	}

	public int getHeight() {
		return height;
	}

	public void setHeight(int height) {
		this.height = height;
	}

	public float getScale() {
		return scale;
	}

	public void setScale(float scale) {
		this.scale = scale;
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public Window getWindow() {
		return window;
	}
}

[avan]

Hey @Lpokimo

I would love to help however I am afraid I would need all and complete java classes in order to help. I am trying to replicate the problem on my computer.

[Lpokimo]

This post is deleted!

[Lpokimo]

This post is deleted!

[Lpokimo]

I found it

[avan]

@Lpokimo said in Java Game engine Problem:

input = new Input(null); (This

In your version you have

input = new Input(null);

in original version it is correct

input = new Input(this);

Line 26 in GameContainer.java file