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Hi, I am doing a project on picture editing and i have a null pointer exception in blur and i can't find out what's wrongs.. AIn this project i only can load .bmp images below is the code. Help me pls.

Code:

Effect Class

import java.awt.image.BufferedImage;


public abstract class Effect 
{
	private BufferedImage image;
	
	public Effect (BufferedImage image)
	{
		this.setImage(image);
	}

	public Effect ()
	{}
	

	public void setImage(BufferedImage image) {
		this.image = image;
	}

	public BufferedImage getImage() {
		return image;
	}
	
	public abstract BufferedImage execute();


}

Blur Class

import java.awt.image.BufferedImage;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;


public class Blur extends Effect
{
	public Blur(BufferedImage image)
	{
		super(image);
	}
	
	/*public BufferedImage execute (BufferedImage image)
	{
		//float weight = 1.0f/9.0f;
		float weight = 1.0f/9.0f;
		
		float [] elements = {weight, weight, weight, weight, weight, weight, weight, weight, weight};
		
		Kernel k = new Kernel (3,3,elements);
		ConvolveOp op = new ConvolveOp(k);
		
		BufferedImage dest = new BufferedImage(image.getWidth(), image.getHeight(), image.getType());
		
		op.filter(image, dest);
		return dest;
	}*/
	@Override
	
	public BufferedImage execute() {
		// TODO Auto-generated method stub
		float weight = 1.0f/9.0f;
		
		float [] elements = {weight, weight, weight, weight, weight, weight, weight, weight, weight};
		
		Kernel k = new Kernel (3,3,elements);
		ConvolveOp op = new ConvolveOp(k);
		
		BufferedImage dest = new BufferedImage(getImage().getWidth(), getImage().getHeight(), getImage().getType());
		
		op.filter(getImage(), dest);
		return dest;
	}

}

The stack trace tells you exactly which line the exception occurs on. Read it and figure out why the variable you are calling a method on is null.

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