Updating Images in swing

[aianta]

So I have my code that displays a generated picture, and I made some text field where I can set some parameters and then see the effects on the picture. However I cant get the picture to update in the existing window. here's my code:

		if (event.getSource().equals(ytextField)){
			imageY = new JLabel(new ImageIcon(va.getImageFromImageCubeFixedY(Integer.parseInt(ytextField.getText()))));
			this.repaint();
			System.out.println("Done! Y");
		}
		
		if (event.getSource().equals(xtextField)){
			imageX = new JLabel(new ImageIcon(va.getImageFromImageCubeFixedX(Integer.parseInt(xtextField.getText()))));
			this.repaint();
			System.out.println("Done! X");
		}

How do I go about updating those images, I tried using a setImage Icon but received a null pointer in the AWT event queue.

And this is where I create the labels

		JLabel imageX = new JLabel(new ImageIcon(va.getImageFromImageCubeFixedX(1)));
		imageX.setBounds(310, 11, 300, 300);
		contentPane.add(imageX);
		
		
		JLabel imageY = new JLabel(new ImageIcon(va.getImageFromImageCubeFixedY(1)));
		imageY.setLocation(620, 11);
		imageY.setSize(300, 300);
		imageZ.setBounds(10, 11, 300, 300);
		contentPane.add(imageY);

Thanks in advance!

[aianta]

Never mind, declared variables when I didn't have to/