Why 500 error when post request to server on Spring?

Question

Java

Please tell me why the error org.springframework.web.client.HttpServerErrorException: 500 appears when a post request is received, while the get request is processed normally (on the client it is written in the same way as post, only the getForObject method is used). The client is on android, the server is made using Spring mvc. What is wrong?
Customer:

public class postFinder extends AsyncTask<Void, Void, String> {
   @Override
    protected String doInBackground(Void... voids) {
       RestTemplate restTemplate = new RestTemplate();
       restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
       String id = restTemplate.postForObject(Constans.GET_MY_ID, ServisConnecter.id, String.class);
       return id;
    }
}

Server:

@RestController
@RequestMapping("/remind")
public class MyController {
    String ip;
    @Autowired
    public AdressServiceInterf adressServiceInterf;

    @RequestMapping(value = "get", method = RequestMethod.GET)
    @ResponseBody
    public long getUserId(HttpServletRequest request){
        ip=getClientIpAddr(request);
        return createMockAdresses(ip);
    }

    @RequestMapping(value = "getrand", method = RequestMethod.POST)
    @ResponseBody
    public String getRandomAdress(@RequestBody Long id){
         return "my id = " + id;
    }
}

Answer 1

well, you don’t have a method for which the POST request is rooted, add it and get another response better than five hundred