docs: private void lookupInstances(String args[]) {
          String serviceName = args[1];
          System.out.println("lookupInstances, serviceName=" + serviceName);
          try {
              List<ServiceInstance> instances = ServiceDirectory.getLookupManager().lookupInstances(serviceName);
              if (instances.size() == 0) {
                  print("");
              } else {
                  for (ServiceInstance instance : instances) {
                      printServiceInstance(instance);
                  }
              }
          } catch (ServiceException e) {
              e.printStackTrace();
              fail(e.getServiceDirectoryError().getErrorMessage());
          }
      }