Java Parent class receives null on BufferedImage

I am trying to create multiple doors from the parent Door and Grandparent Objects. Every variable has the value I expect it to have EXCEPT the BufferedImage ones. For some reason every BufferedImage after IronDoor receives null. It does have the value I want it to have in IronDoor. Closed, padlocked and open are all null. So I get why drawThis is null, but why the others too? What am I doing wrong with BufferedImage?

This is my code:

public class Objects {

public boolean collision = true;
public int x, y, width, height;
public Rectangle solidArea;
public int tileSize, solidAreaX, solidAreaY, solidAreaWidth, solidAreaHeight;
protected ScreenPosition position;
protected BufferedImage drawThis;
public Keyboard keyboard;

    public Objects() {
            this.position = new ScreenPosition();
            Screen screen = new Screen();
            this.tileSize = 48;
            this.width = tileSize;
            this.height = tileSize;
            this.solidAreaX = 0;
            this.solidAreaY = 0;
            this.solidAreaWidth = tileSize;
            this.solidAreaHeight = tileSize;
            this.solidArea = new Rectangle(solidAreaX, solidAreaY, solidAreaWidth, solidAreaHeight);
    }
}

    public class Door extends Objects {
    
    public boolean locked = true, opened = false;
    BufferedImage closed, padlocked, open;
    Image image = new Image();
    
    public Door () {
        this.drawThis();
        this.height = tileSize * 2;
    }
    
        private void drawThis() { 
            if(locked) { 
                opened = false; 
                super.drawThis = padlocked; 
            } 
            else if(opened) { 
                locked = false; 
                super.drawThis = open; 
            } 
            else { 
                super.drawThis = closed; 
            } 
        } 
    }

    public class IronDoor extends Door {
    
        public IronDoor(Keyboard keyboard, int x, int y, boolean locked) {
            super.closed = image.getImage("/Objects/iron door closed.png");
            super.padlocked = image.getImage("/Objects/iron door locked.png");
            super.open = image.getImage("/Objects/iron door open.png");
            super.keyboard = keyboard;
            super.x = x;
            super.y = y;
            super.locked = locked;
        }
    }
    
    //This is outside the classes:
    
    ArrayList<Objects> objects = new ArrayList<Objects>(); 
    objects.add(new IronDoor(keyboard, 180, 190, true)); 
    objects.add(new IronDoor(keyboard, 300, 190, false));

//And this is where I make the image:
//I've been able to draw every other object I wanted with this class. But those objects weren't part of an inheritance.

    public class Image {
        public BufferedImage getImage(String path) {
            BufferedImage image = null;
            try {
                image = ImageIO.read(getClass().getResourceAsStream(path));
            }
            catch (IOException e) {
                e.printStackTrace();
            }
            return image;
        }
    }

Answer

Ensure following files exists in the same location that files for working components are:

• "/Objects/iron door closed.png"
• "/Objects/iron door locked.png"
• "/Objects/iron door open.png"

Note that leading slash is meaningful.