json to collection (list) in SpringBoot - json

Question

I'm trying to get a list of orders from another service(url) with #GetMapping.
I can't get the json objects and convert them to a list.I keep getting these and similar errors:
org.springframework.web.client.HttpServerErrorException$InternalServerError:
500 Server Error: [java.lang.IllegalStateException: Not a JSON Object: null at com.google.gson.JsonElement.getAsJsonObject(JsonElement.java:91)
What should I do? please help me for how many days i can't find the right solution.
#Autowired
private final RestTemplate restTemplate;
#Value("${baseUrl}")
private String baseUrl;
public OrdersController(OrdersService ordersService, TradesService tradesService, RestTemplate restTemplate) {
this.ordersService = ordersService;
this.tradesService = tradesService;
this.restTemplate = restTemplate;
}
#GetMapping (value ="/restDeneme", produces="application/json")
public List <Orders> getOrders(){
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity<String> entity = new HttpEntity<String>(headers);
ResponseEntity<List<Orders>> response = restTemplate.exchange(
baseUrl , HttpMethod.GET,entity,
new ParameterizedTypeReference<List<Orders>>() {});
return response.getBody();
}

Answer 1

You should try to receive the data as a JSON object
for a JSON format like this;
{
"Kml": {
"bicak": "AWAKEN YOUR SENSES",
"jobsearch": "JOB SEARCH",
"contact": "CONTACT",
"video": "ENCHANTING BEACHSCAPES",
"createprofile": "CREATE PROFILE"
}
}
You can call it like this;
String loudScreaming = json.getJSONObject("Kml").getString("bicak");