Canvas won't draw on composite (SWT)

I can't get a canvas to draw on a composite with SWT. I've made the composite on a shell and given it a layout but the canvas won't draw the image. Please help me and bare with me because I'm new to java. The relevant code is below.

public static void main(String[] args) {

    final Display display = new Display();
    final Image img = new Image(display,"C:\\Users\\Public\\Pictures\\Sample 
                                  Pictures\\Lighthouse.jpg");

    final Shell shell = new Shell(display);
    shell.setText("Canvas in Composite");

    Composite comp = new Composite(shell, SWT.BORDER);
    comp.setBounds(0, 0, 500, 500);
    comp.setLayout(new FillLayout());

    final Canvas can = new Canvas(comp, SWT.NONE);
    can.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            e.gc.drawImage(img, 0, 0);
        }
    });

    shell.open();

    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            display.sleep();
        }
    }

    img.dispose();
    display.dispose();
}