Can pass my own object with RestTemplate PUT - json

Question

I want to build a small RESTful Service, send a PUT request with an Object of a class I created (MyObject), and getting a response with only status.
My controler:
#RestController
public class MyControler {
#RequestMapping(path = "/blabla/{id}", method = RequestMethod.PUT)
#ResponseBody
public ResponseEntity<String> putMethod (#PathVariable("id") Long id,
#RequestBody MyObject t) {
/*todo*/
return new ResponseEntity<String>(HttpStatus.OK);
}
My Test App
#SpringBootApplication
public class App {
public String httpPut(String urlStr) {
MyObject myObject = new MyObject(p,p,....);
URI url = null;
HttpEntity<MyObject> requestEntity;
RestTemplate rest = new RestTemplate();
rest.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
HttpHeaders headers = new HttpHeaders();
List<MediaType> list = new ArrayList<MediaType>();
list.add(MediaType.APPLICATION_JSON);
headers.setAccept(list);
headers.setContentType(MediaType.APPLICATION_JSON);
headers.add("Content-Type", "application/json");
requestEntity = new HttpEntity<Transaction>(t, headers);
ResponseEntity<String> response =
rest.exchange(url, HttpMethod.PUT, requestEntity, MyObject.class);
return response.getStatusCode().getValue();
}
Im getting an HttpClientErrorException: 400 Bad Request
Where is my mistake? What I want is for Spring to automaticly serialize the MyObject. MyObject class is implementing serializable.
What do I miss?
}

Answer 1

Maybe you're doing to much?
Did you try to put the object as json via postman or something similar? If so what is the response?
Nevertheless i created a minimal example for consuming a service via Springs RestTemplate.
This is all needed code for getting a custom object AND putting a custom object via RestTemplate
public void doTransfer(){
String url = "http://localhost:8090/greetings";
RestTemplate restTemplate = new RestTemplate();
ResponseEntity<Greeting> greeting = restTemplate.getForEntity(url, Greeting.class);
LOGGER.info(greeting.getBody().getValue());
Greeting myGreeting = new Greeting();
myGreeting.setValue("Hey ho!");
HttpEntity<Greeting> entity = new HttpEntity<Greeting>(myGreeting);
restTemplate.exchange(url, HttpMethod.PUT, entity, Greeting.class);
}
I've provided a sample project with a sender (maybe not a good name .. it is the project with the greetings endpoint) and a receiver (the project which consumes the greetings endpoint) on Github

Answer 2

Try to do this:
ResponseEntity<MyObject> responseSerialized =
rest.exchange(url, HttpMethod.PUT, requestEntity, MyObject.class);