RestTemplate.postForObject() works, but exchange() does not

Question

I have an application that sends api calls to another application, with this code:

objreq.setReq(request);
HttpEntity<Request> entity = new HttpEntity<Request>(objreq, headers);

ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.POST, entity, String.class);

where headers contains application/json of course.

The problem is, is that the objreq is set correctly, however, when it calls the other api:

@PostMapping
  public ResponseEntity<Response> insertRequest(
          @RequestBody @Valid Request request) {
    requestService.insertRequest(request);
    return ResponseEntity.ok(new ResponseSuccess<>());
  }

all the fields are null. This is really annoying as the fields are set correctly in the request, but in everything is null in the response.

Note: this code works fine

restTemplate.postForObject(url, request, String.class);

Would like to know why the exchange does not work, unfortunately I don't have much experience with RestTemplate, so not sure if the issue is here. Many Thanks

Answer 1

根据本文档 ， ok(T body)从参数T body构造ResponseSuccess T body ，您传递了ResponseSuccess对象，这可能是这里的问题，我不知道ResponseSuccess类的内部内容（无法查找此类的文档，因此我无法确定问题可能在此类中的什么地方），但我会在那里查找问题。