Getting values from JSON using REST client - spring

Question

My api is working fine and I did get back JSON result when tested in POSTMAN. I have problem retrieving the JSON value through a controller using a REST client. I am using spring and hibernate.
#RequestMapping(value = "/viewForm/{id}")
public String viewForm(#Valid #PathVariable("id") String id, Model model) {
RestTemplate restTemplate = new RestTemplate();
String fooResourceUrl
= "http://localhost:8080/api/delivery/searchDanceform/"+ id;
System.out.println(fooResourceUrl);
ResponseEntity<DanceApplicationForm> rateResponse =
restTemplate.exchange(fooResourceUrl,
HttpMethod.GET, null, DanceApplicationForm.class);
DanceApplicationForm response = rateResponse.getBody();
System.out.println(response);
logger.info("result = {}", response);
return VIEW_PATH + "dance-profile";
}
I got this error,
SEVERE: Servlet.service() for servlet [dispatcher] in context with path [/intranet-web] threw exception [Request processing failed; nested exception is org.springframework.web.client.HttpClientErrorException: 404 null] with root cause
org.springframework.web.client.HttpClientErrorException: 404 null
at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:78)
at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:700)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:653)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:613)
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:531)
at sg.com.ctc.intranet.web.training.controller.DanceController.viewDanceApplicationForm(DanceController.java:239)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
I have also tried this way.
String response = restTemplate.getForObject(fooResourceUrl, String.class);
but is still not working.

Answer 1

You are passing null value in exchange method, actually in place of null you have to pass entity refrence.
HttpHeaders headers = new HttpHeaders();
headers.set("Accept", "application/json");
HttpEntity entity = new HttpEntity(headers);
ResponseEntity<DanceApplicationForm> rateResponse = restTemplate.exchange(url, HttpMethod.GET, entity, DanceApplicationForm.class);

Answer 2

I place it in the answer section because I am not too sure where I can reply with my code.
#RequestMapping(value = "/viewDanceApplication/{id}")
public String viewDanceApplicationForm(#Valid #PathVariable("id") String id, Model model) {
RestTemplate restTemplate = new RestTemplate();
String fooResourceUrl
= "http://localhost:8080/api/delivery/searchDanceform/"+ id;
HttpHeaders headers = new HttpHeaders();
headers.set("Accept", "application/json");
HttpEntity entity = new HttpEntity(headers);
ResponseEntity<DanceApplicationForm> rateResponse = restTemplate.exchange(fooResourceUrl, HttpMethod.GET, entity, DanceApplicationForm.class);
logger.info("result = {}", rateResponse);
model.addAttribute("showProfile",rateResponse);
return VIEW_PATH + "dance-profile";
}

Answer 3

This is your handler controller of
http://localhost:8080/api/delivery/searchDanceform/
#RequestMapping(value = "/searchDanceform/{id}")
public String searchDanceform(#Valid #PathVariable("id") String id, Model model) {
// do your code and return response
}