code: void savePreviousActionInfo( ActionForm form, HttpServletRequest request, ActionMapping mapping,
                                   ServletContext servletContext )
      {
          //
          // Save this previous-action info in the *current page flow*.
          //
          PageFlowController currentJpf = PageFlowUtils.getCurrentPageFlow( request, getServletContext() );
          if ( currentJpf != null ) currentJpf.savePreviousActionInfo( form, request, mapping, servletContext );
      }
docs: Store information about the most recent action invocation.  This is a framework-invoked method that should not
  normally be called directly