I am creating a game in which I import images from files to represent characters, etc. I have created a class called Contents which represents anything that can be placed on a tile of the gameboard. A subclass of Contents (by several levels) is Wizard, to create a wizard character. I have it set up so that Contents contains several protected variables whose values are set in Wizard.

protected Tile currentTile; //The tile of the contents
protected final Toolkit tools=Toolkit.getDefaultToolkit();
protected URL url; //url of the image corresponding to the contents
protected Image image; //the image itself

In Wizard,


Contents also contains a draw method to draw it on a specified tile.

public void draw(Graphics g, ImageObserver i)
        g.drawImage(image, (currentTile.getX()*30)+10, (currentTile.getY()*30)+10, 29, 29, i); //EXCEPTION
    catch(NullPointerException e)

I get a NullPointerException on the line where I try to draw the image. However, when I go to Wizard and print out both the URL and the image, both come out as expected. Not sure why the image is seen as being null. Any help would be awesome.

What object reference is null causing the NPE?
On that line there are three object references. Which one is null?

Wow... I feel like an idiot. Instead of using a method to set currentTile, I used the method to return the tile that I wanted to set it to... thanks and sorry about that!

This question has already been answered. Start a new discussion instead.