code: public void addServletMapping( String servletName, String urlPattern )
      {
          if ( ! urlPattern.endsWith( PageFlowConstants.PAGEFLOW_EXTENSION ) )
          {
              super.addServletMapping( servletName, urlPattern );
          }
      }
docs: Struts keeps track of the action servlet URL pattern (e.g., *.do) so it can construct action
  URIs.  We want to prevent it from noticing *.jpf so it doesn't use that to construct the URIs.
  
  @exclude