code: public Template findTemplate(String uri,
                                   HttpServletRequest request,
                                   HttpServletResponse response)
          throws ServletException, IOException {
  
          return findTemplate(uri, request, response, getTemplateSource());
      }
docs: Finds a template based on the given URI. If path ends in a slash, revert
  to loading default template. If default not found or not specified,
  return null.
  
  @param uri  the URI of the template to find
  @return the template that maps to the URI or null if no template maps to
  the URI