@After
 @SuppressWarnings("unchecked")
 public void testShutdown() throws Exception {
   APIResponse response = userAPI.show("all");
   if (response.isDone()) {
     Collection<User> users = (Collection<User>) response.getMessage();
     for (User user : users) {
       response = userAPI.delete(user.getId());
       if (response.isDone()) {
         assertEquals("User Deleted!", response.getMessage().toString());
       } else {
         logger.log(Level.SEVERE, response.getMessage().toString());
       }
     }
   } else {
     logger.log(Level.SEVERE, response.getMessage().toString());
   }
   sender = null;
   receiver = null;
   mail = null;
   userAPI = null;
   mailAPI = null;
 }