Failed : HTTP error code : 400 While postin JSON data to URL

Question

I tried searching the net for this issue but finally ended up getting no proper answer.

I am trying to post a json data to a URL, I have no idea where my code went wrong, I am getting Exception in thread "main" java.lang.RuntimeException: Failed : HTTP error code : 400 It would be of great help if anyone could help me outwith this issue.

MyCode :

public class JsonTest {

    public static void main(String[] args) throws IOException {
        try {

            URL url = new URL("http://10.48.151.32:30304/transactionManagement/v2/transaction");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type", "application/json");

            String input = "{\"qty\":100,\"name\":\"iPad 4\"}";

            OutputStream os = conn.getOutputStream();
            os.write(input.getBytes());
            os.flush();

            if (conn.getResponseCode() != HttpURLConnection.HTTP_CREATED) {
                throw new RuntimeException("Failed : HTTP error code : "
                    + conn.getResponseCode());
            }

            BufferedReader br = new BufferedReader(new InputStreamReader(
                    (conn.getInputStream())));

            String output;
            System.out.println("Output from Server .... \n");
            while ((output = br.readLine()) != null) {
                System.out.println(output);
            }

            conn.disconnect();

          } catch (MalformedURLException e) {

            e.printStackTrace();

          } catch (IOException e) {

            e.printStackTrace();

         }

        }

    }

Error Exception :

Exception in thread "main" java.lang.RuntimeException: Failed : HTTP error code : 400
    at JsonTest.main(JsonTest.java:36)

My JSON DATA:

{
"request": {
"header": {
"signature": "BHNUMS",
"details": {
"productCategoryCode": "01",
"specVersion": "04"
}
},
"transaction": {
"primaryAccountNumber": "8961060000402122658",
"processingCode": "725400",
"transactionAmount": "000000000200",
"transmissionDateTime": "150505141718",
"systemTraceAuditNumber": "035689",
"localTransactionTime": "141718",
"localTransactionDate": "150505",
"merchantCategoryCode": "0443",
"pointOfServiceEntryMode": "021",
"pointOfServiceConditionCode":"00",
"transactionFeeAmount":"000000000200",
"acquiringInstitutionIdentifier": "10998156762",
"track2Data":";8961060000402122658=4912?",
"retrievalReferenceNumber": "44436440441",
"merchantTerminalId": "87654     987   ",
"merchantIdentifier": "10998156762",
"merchantLocation": "688 PACIFIC HIGHWAYYY CHHHHATSWOOD NSWAU",
"transactionCurrencyCode": "840",
"additionalTxnFields": 
{ "productId": "07675018955" ,
   "externalAccountNumber":"353142040651369",
   }
}
}
} 

Screenshot

Answer 1

I am also facing this error .You need to add extra line in your code

conn.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:27.0) Gecko/20100101 Firefox/27.0.2 Waterfox/27.0");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

conn.setDoOutput(true);

conn.setDoInput(true);

conn.setRequestProperty("Content-Type", "application/json; utf-8");

conn.setRequestProperty("Accept", "application/json");