POST request via RestTemplate in JSON

Question

I didn t find any example how to solve my problem  so I want to ask you for help  I can t simply send POST request using RestTemplate object in JSON  Every time I get      org springframework web client HttpClientErrorException  415 Unsupported Media Type   I use RestTemplate in this way       restTemplate   new RestTemplate    List lt HttpMessageConverter lt   gt  gt  list   new ArrayList lt HttpMessageConverter lt   gt  gt     list add new MappingJacksonHttpMessageConverter     restTemplate setMessageConverters list       Payment payment  new Payment  Aa4bhs    Payment res   restTemplate postForObject  http   localhost 8080 aurest rest payment   payment  Payment class     What is my fault

User · Answer

The  415 Unsupported Media Type  error is telling you that the server will not accept your POST request  Your request is absolutely fine  it s the server that s mis-configured   MappingJacksonHttpMessageConverter will automatically set the request content-type header to application json  and my guess is that your server is rejecting that   You haven t told us anything about your server setup  though  so I can t really advise you on that

User · Answer

If you don t want to map the JSON by yourself  you can do it as follows   RestTemplate restTemplate   new RestTemplate    restTemplate setMessageConverters Arrays asList new MappingJackson2HttpMessageConverter      ResponseEntity lt String gt  result   restTemplate postForEntity uri  yourObject  String class

User · Answer

If you dont want to process response   private RestTemplate restTemplate   new RestTemplate    restTemplate postForObject serviceURL  request  Void class     If you need response to process  String result   restTemplate postForObject url  entity  String class

User · Answer

Why work harder than you have to  postForEntity accepts a simple Map object as input  The following works fine for me while writing tests for a given REST endpoint in Spring  I believe it s the simplest possible way of making a JSON POST request in Spring    Test public void shouldLoginSuccessfully           restTemplate  below has been  Autowired prior to this   Map map   new HashMap lt String  String gt       map put  username    bob123      map put  password    myP ssw0rd      ResponseEntity lt Void gt  resp   restTemplate postForEntity         http   localhost 8000 login         map        Void class     assertThat resp getStatusCode    isEqualTo HttpStatus OK

User · Answer

I m doing in this way and it works    HttpHeaders headers   createHttpHeaders map   public HttpHeaders createHttpHeaders Map lt String  String gt  map           HttpHeaders headers   new HttpHeaders        headers setContentType MediaType APPLICATION JSON       for  Entry lt String  String gt  entry   map entrySet              headers add entry getKey   entry getValue               return headers         Pass headers here   String requestJson         Construct your JSON here     logger info  Request JSON    requestJson   HttpEntity lt String gt  entity   new HttpEntity lt String gt  requestJson  headers   ResponseEntity lt String gt  response   restTemplate exchange url  HttpMethod POST  entity  String class   logger info  Result - status     response getStatusCode        has body      response hasBody     logger info  Response    response getBody       Hope this helps

User · Answer

I ran across this problem when attempting to debug a REST endpoint  Here is a basic example using Spring s RestTemplate class to make a POST request that I used  It took me quite a bit of a long time to piece together code from different places to get a working version   RestTemplate restTemplate   new RestTemplate     String url    endpoint url   String requestJson       queriedQuestion     Is there pain in your hand       HttpHeaders headers   new HttpHeaders    headers setContentType MediaType APPLICATION JSON    HttpEntity lt String gt  entity   new HttpEntity lt String gt  requestJson headers   String answer   restTemplate postForObject url  entity  String class   System out println answer     The particular JSON parser my rest endpoint was using needed double quotes around field names so that s why I ve escaped the double quotes in my requestJson String

User · Answer

I tried as following in spring boot  ParameterizedTypeReference lt Map lt String  Object gt  gt  typeRef   new ParameterizedTypeReference lt Map lt String  Object gt  gt        public Map lt String  Object gt  processResponse String urlendpoint        try               HttpHeaders headers   new HttpHeaders            headers setContentType MediaType APPLICATION JSON             reqobj         JSONObject request   new JSONObject            request put  quot username quot   name             Or Hashmap          Map lt String  Object gt  reqbody    new HashMap lt  gt             reqbody put  quot username quot  username           Gson gson   new Gson     mvn plugin to convert map to String         HttpEntity lt String gt  entity   new HttpEntity lt  gt   gson toJson reqbody   headers           ResponseEntity lt Map lt String  Object gt  gt  response   resttemplate exchange urlendpoint  HttpMethod POST  entity  typeRef    example of post req with json as request payload         if Integer parseInt response getStatusCode   toString       HttpURLConnection HTTP OK                        Map lt String  Object gt   responsedetails   response getBody                System out println responsedetails    whole json response as map object             return responsedetails                  catch  Exception e               TODO  handle exception         System err println e             return null

User · Answer

I was getting this problem and I m using Spring s RestTemplate on the client and Spring Web on the server  Both APIs have very poor error reporting  making them extremely difficult to develop with    After many hours of trying all sorts of experiments I figured out that the issue was being caused by passing in a null reference for the POST body instead of the expected List  I presume that RestTemplate cannot determine the content-type from a null object  but doesn t complain about it  After adding the correct headers  I started getting a different server-side exception in Spring before entering my service method    The fix was to pass in an empty List from the client instead of null  No headers are required since the default content-type is used for non-null objects

User · Answer

If you are using Spring 3 0  an easy way to avoid the org springframework web client HttpClientErrorException  415 Unsupported Media Type exception  is to include the jackson jar files in your classpath  and use mvc annotation-driven config element  As specified here   I was pulling my hair out trying to figure out why the mvc-ajax app worked without any special config for the MappingJacksonHttpMessageConverter  If you read the article I linked above closely       Underneath the covers  Spring MVC   delegates to a HttpMessageConverter to   perform the serialization  In this   case  Spring MVC invokes a   MappingJacksonHttpMessageConverter   built on the Jackson JSON processor    This implementation is enabled   automatically when you use the   mvc annotation-driven configuration   element with Jackson present in your   classpath

User · Answer

As specified here I guess you need to add a messageConverter for  MappingJacksonHttpMessageConverter

User · Answer

I ve been using rest template with JSONObjects as follow      create request body JSONObject request   new JSONObject    request put  username   name   request put  password   password       set headers HttpHeaders headers   new HttpHeaders    headers setContentType MediaType APPLICATION JSON   HttpEntity lt String gt  entity   new HttpEntity lt String gt  request toString    headers       send request and parse result ResponseEntity lt String gt  loginResponse   restTemplate    exchange urlString  HttpMethod POST  entity  String class   if  loginResponse getStatusCode      HttpStatus OK      JSONObject userJson   new JSONObject loginResponse getBody       else if  loginResponse getStatusCode      HttpStatus UNAUTHORIZED         nono    bad credentials

User · Answer

For me error occurred with this setup   AndroidAnnotations Spring Android RestTemplate Module and      GsonHttpMessageConverter  Android annotations has some problems with this converted to generate POST request without parameter  Simply parameter new Object   solved it for me

User · Answer

This code is working for me   RestTemplate restTemplate   new RestTemplate    Payment payment   new Payment  Aa4bhs    MultiValueMap lt String  Object gt  map   new LinkedMultiValueMap lt String  Object gt     map add  payment   payment   HttpEntity lt MultiValueMap lt String  Object gt  gt  httpEntity   new HttpEntity lt MultiValueMap lt String  Object gt  gt  map  headerObject    Payment res   restTemplate postForObject url  httpEntity  Payment class

User · Answer

This technique worked for me   HttpHeaders headers   new HttpHeaders    headers setContentType MediaType APPLICATION JSON    HttpEntity lt String gt  entity   new HttpEntity lt String gt  requestJson  headers   ResponseEntity lt String gt  response   restTemplate put url  entity     I hope this helps

[java] POST request via RestTemplate in JSON

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