code: public WebAppFilterChain getFilterChain(String reqURI, ServletWrapper reqServlet) throws ServletException {
  
          return this.getFilterChain(reqURI, reqServlet, DispatcherType.REQUEST);
      }
docs: Returns a WebAppFilterChain object corresponding to the passed in uri and
  servlet. If the filter chain has previously been created, return that
  instance...if not, then create a new filter chain instance, ensuring that
  all filters in the chain are loaded
  
  @param uri
  - String containing the uri for which a filter chain is
  desired
  
  @return a WebAppFilterChain object corresponding to the passed in uri
  
  @throws ServletException