HTTP error 400 Bad Request when POSTing JSON data over HttpURLConnection

Question

I have this code below that trying to post JSON data after successfully authenticate through Oauth2.0, the code is like this:

try { URL url = new URL ("https://test.api.neteller.com/v1/oauth2/token?grant_type=client_credentials"); String test = "QUFBQlNhVlFoUjhlTVhPQjowLm9aV3g2Rkhwd1dIQUZnXzRaMDZwOUoyRWtzaXVHMHEzd2xrVFF4MkRVM28uN0FzUDE4cmZXU0dxVDdqWE1NUGhzSFY4cHU0"; HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod("POST"); connection.setDoOutput(true); connection.setRequestProperty ("Authorization", "Basic " + test); String accessToken = ""; [... get the access token ...] String urlnew = "https://test.api.neteller.com/v1/transferIn"; URL obj = new URL(urlnew); HttpsURLConnection con = (HttpsURLConnection) obj.openConnection(); //add request header con.setRequestMethod("POST"); con.setDoOutput(true); con.setRequestProperty ("Authorization", "Bearer " + accessToken); con.setRequestProperty("Content-Type", "application/json"); // Send post request JSONObject obj2 = new JSONObject(); obj2.put("paymentMethod", ""); obj2.put("type", "neteller"); obj2.put("value", "[email protected]"); obj2.put("transaction", ""); obj2.put("merchantRefId", "20140203122501"); obj2.put("amount", (5000)); obj2.put("currency", "USD"); obj2.put("verificationCode", "411392"); System.out.print(obj2); int responseCode = con.getResponseCode(); System.out.println("Response Code : " + responseCode); [... parse response ...] } catch(Exception e) { e.printStackTrace(); }

I get this error when I run the code above:

java.io.IOException: Server returned HTTP response code: 400 for URL: https://test.api.neteller.com/v1/transferIn at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source) at example.demo.main(demo.java:71) Caused by: java.io.IOException: Server returned HTTP response code: 400 for URL: https://test.api.neteller.com/v1/transferIn at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at java.net.HttpURLConnection.getResponseCode(Unknown Source) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(Unknown Source) at example.demo.main(demo.java:65)

From the error status 400 I know that the post JSON data is invalid. I suspect maybe in the structure because according to the documentation it should be like this:

{ "paymentMethod": { "type": "neteller", "value": "[email protected]" }, "transaction": { "merchantRefId": "20140203122501", "amount": 5000, "currency": "USD" }, "verificationCode": "234124" }

So how do I change the JSON parameter so that it could follow the structure in the documentation?

paymentMethod and transaction should be JSONObjects themselves. — guido
– guido, Commented Nov 18, 2014 at 14:33
also you are not writing your json anywhere else than the console.... — guido
– guido, Commented Nov 18, 2014 at 14:37
What do you mean they should be JSONObject themselves? also where else should i write them? thanks for your reply — StrikeNeo
– StrikeNeo, Commented Nov 18, 2014 at 15:15

guido · Accepted Answer · 2014-11-18 15:51:13Z

For the required data scheme, like this:

JSONObject obj2 = new JSONObject(); JSONObject paymentMethod = new JSONObject(); paymentMethod.put("type", "neteller"); paymentMethod.put("value", "[email protected]"); obj2.put("paymentMethod", paymentMethod); JSONObject transaction = new JSONObject(); transaction.put("merchantRefId", "20140203122501"); transaction.put("amount", (5000)); transaction.put("currency", "USD"); obj2.put("transaction", transaction); obj2.put("verificationCode", "411392");

For writing in the outputStream of the connection (the payload of the POST):

BufferedWriter out = new BufferedWriter(new OutputStreamWriter(con.getOutputStream())); out.write(obj2.toString()); out.close();

the above, before reading the responseCode.

OMG it works! Thanks so much, u save me a lot of trouble, THANKS again

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