Spring RestTemplate Send List an get List
java, resttemplate, spring, spring-boot
Solution
Check if your code is like below. This should work.
//header
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
//person list
List<Person> personList = new ArrayList<Person>();
Person person = new Person();
person.setName("UserOne");
personList.add(person);
//httpEnitity
HttpEntity<Object> requestEntity = new HttpEntity<Object>(personList,headers);
ResponseEntity<List<Person>> rateResponse = restTemplate.exchange(url, HttpMethod.POST, requestEntity,new ParameterizedTypeReference<List<Person>>() {});
Problem
I want to make a service with Spring's `RestTemplate`, in my service side the code is like this : ``` @PostMapping(path="/savePersonList") @ResponseBody public List<Person> generatePersonList(@RequestBody List<Person> person){ return iPersonRestService.generatePersonList(person); } ``` In client side if I call the service with this code: ``` List<Person> p = (List<Person>) restTemplate.postForObject(url, PersonList, List.class); ``` I can't use the `p` object as `List<Person>`, it will become a `LinkedHashList`. After some research I find a solution that said I have to call the service with exchange method: ``` ResponseEntity<List<Person>> rateResponse = restTemplate.exchange(url, HttpMethod.POST, personListResult, new ParameterizedTypeReference<List<Person>>() {}); ``` and with this solution the server can't take the object and raise an exception , what's the correct way?