docs: public void doStatus(@Param("pageIndex") int pageIndex, @Param("searchKey") String searchKey,
                           @Param("channelId") Long channelId, @Param("status") String status, Navigator nav)
                                                                                                             throws WebxException {
          String errorType = null;
          if (status.equals("start")) {
              try {
                  channelService.startChannel(channelId);
              } catch (ManagerException e) {
                  if (e.getCause() instanceof InvalidConfigureException) {
                      errorType = ((InvalidConfigureException) e.getCause()).getType().name();
                  }
              } catch (InvalidConfigureException rce) {
                  errorType = rce.getType().name();
              }
  
          } else if (status.equals("stop")) {
              channelService.stopChannel(channelId);
          }
  
          if (errorType != null) {
              nav.redirectToLocation("channelList.htm?pageIndex=" + pageIndex + "&searchKey=" + urlEncode(searchKey)
                                     + "&errorType=" + errorType);
          } else {
              nav.redirectToLocation("channelList.htm?pageIndex=" + pageIndex + "&searchKey=" + urlEncode(searchKey));
          }
      }