Composite with Image

For some reason, I need to have a class extending composite with only an image inside. When I use it I can never get the image to display + other strange behaviours. So I simplified the code and it turns out even the code below doesn't display anything. Is it possible to composite with an Image?

public class TestImage extends Composite {
   
    public TestImage(){
        initWidget(new Image());
    }
   
    public void setResource(ImageResource resource) {
        ((Image) getWidget()).setResource(resource);
    }
   
}

image = new TestImage();
image.setResource(xxx);
panel.add(image);

The image is there but no resource is being displayed.
I am sure it is somethign pretty trivial that I have overlooked.

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