Sending JSON by POST using Restlet results in "400 Bad request" error

Question

When trying to send a JSON object to the server using POST method, "400 Bad request" error is returned. Standard Java application (SDK) with Restlet api is used to make this request.

Given that the:

• host address is "http://myhostname.com/api/v1/parts/"
• access_key is "8QON4KC7BMAYYBCEX"

here is how the code so far looks like:

ClientResource resource = new ClientResource("http://myhostname.com/api/v1/parts/");

        resource.setMethod(Method.POST);
        resource.getReference().addQueryParameter("format", "json");
        resource.getReference().addQueryParameter("access_key", "8QON4KC7BMAYYBCEX");

            // create json object and populate it
            JSONObject obj = new JSONObject();
        try {
               obj.put("partId", "23");
               obj.put("carId", "34");
               obj.put("name", "chassis");
               obj.put("section", "frame");
        } catch (JSONException e1) {// handling of exception}

        StringRepresentation stringRep = new StringRepresentation(obj.toString());
        stringRep.setMediaType(MediaType.APPLICATION_JSON);

        try {
               resource.post(stringRep).write(System.out); // exception occurs here
        } catch (Exception e) {// handling of exceptions }

Response from server is "400 Bad request". Here is the console output:

Bad Request (400) - BAD REQUEST
    at org.restlet.resource.ClientResource.doError(ClientResource.java:612)
    at org.restlet.resource.ClientResource.handleInbound(ClientResource.java:1202)
    at org.restlet.resource.ClientResource.handle(ClientResource.java:1069)
    at org.restlet.resource.ClientResource.handle(ClientResource.java:1044)
    at org.restlet.resource.ClientResource.post(ClientResource.java:1453)
    at tests.RESTTestReceiverPOST.main(RESTTestReceiverPOST.java:39)

When using Chrome POSTMAN plugin to send this json object (and it works with POSTMAN), the output of the POST request looks like this:

/api/v1/parts/?format=json&access_key=8QON4KC7BMAYYBCEX HTTP/1.1
Host: myhostname.com
Content-Type: application/json

{ "partId": "23", "carId": "34", "name": "chassis", "section": "frame" }

Any suggestions on what may be wrong in the code? Thanks.

Answer 1

Solved it. You were right @Octopus, there was a problem in this code:

   obj.put("partId", "23");
   obj.put("carId", "34");
   obj.put("name", "chassis");
   obj.put("section", "frame");

It should look like (numbers without quotes):

obj.put("partId", 23);
obj.put("carId", 34);
obj.put("name", "chassis");
obj.put("section", "frame");

Thanks again both @Octopus and @Sotirios Delimanolis for your time and help.