public ModelAndView handleResourceRequest(
ResourceRequest request, ResourceResponse response) throws Exception {
if (!(this.portletInstance instanceof ResourceServingPortlet)) {
throw new NoHandlerFoundException("Cannot handle resource request - target portlet [" +
this.portletInstance.getClass() + " does not implement ResourceServingPortlet");
}
ResourceServingPortlet resourcePortlet = (ResourceServingPortlet) this.portletInstance;
// Delegate to PortletContentGenerator for checking and preparing.