private static List<Server> parseServers(DeployConfig config, String targetServer) {
    List<Server> result = new ArrayList<Server>();
    boolean flag = true;
    String[] serverList = targetServer.split(C.separator);
    Server server = null;
    for (String target : serverList) {
      server = config.getServers().getServerById(target);
      flag = flag && server != null;
      if (!flag) {
        logger.error("Not found server with id:" + target);
        result.clear();
        break;
      }
      result.add(server);
    }
    return result;
  }