Colocating images with Wicket

Say you want to keep all your images in one directory for easy management. It's not always possible with Wicket 1.2.x to keep your images in WEB-INF/images. Wicket wants them to be in the source hierarchy. For example, say you are using a wicket.markup.html.tree.Tree, and you want to override the node images. You need to provide a wicket.markup.html.image.Image, as follows:

public class NavTree extends Tree
{
    @Override
    protected Image getNodeImage(DefaultMutableTreeNode node)
    {
        ...
    }
}

To colocate my images for such purposes, I created a package, say com.my.images, and in that directory, I created an empty class called ImageAnchor.java. Then to create my image I can call:

new Image(Tree.NODE_IMAGE_NAME,
new ResourceReference(com.my.images.ImageAnchor.class, "penguin.gif"));

But what if I also want to refer to my images from html or css? Fortunately, there is a way to do this. For example, in CSS:

background-image:url(/app/resources/com.my.images.ImageAnchor/penguin.gif);