Cannot Access Token in OAuth2.0 using JAVA

[Durga Roobini]

am trying for oauth2 authentication for imgur Api in java,i am getting the code from redirect URI but i cannot get the access token from the line

Token accessToken = service.getAccessToken(OAuthConstants.EMPTY_TOKEN,new Verifier(code));

i have to send clientid,clientsecret,granttype,code to access token url by using POST method i tried but i got error like

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.scribe.exceptions.OAuthException: Cannot extract an acces token. Response was: {"data":{"error":"Missing required fields","request":"\/oauth2\/token","method":"GET"},"success":false,"status":400}
org.scribe.extractors.JsonTokenExtractor.extract(JsonTokenExtractor.java:24)
org.scribe.oauth.OAuth20ServiceImpl.getAccessToken(OAuth20ServiceImpl.java:37)
com.durga.ImgurCallbackServlet.doGet(ImgurCallbackServlet.java:54)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.16 logs.


--------------------------------------------------------------------------------

Apache Tomcat/6.0.16


here is my coding that what i tried is

OAuthService service = new ServiceBuilder()
        .provider(Imgur.class)
        .apiKey("c73d45b27885464")
        .apiSecret("0d256ffeaf57869b58b1511f57dff7f8901e1086")
        .build();
		String code = request.getParameter(OAuthConstants.CODE);

		//Verifier verifier=new Verifier();
		pw.println(code);
		System.out.println("verifier:"+code);    // i receive code here

             HttpClient httpclient = new HttpClient();
			 
			PostMethod post = new PostMethod("https://api.imgur.com/oauth2/token");
			post.addParameter("code", "fd85e59bf129f816736d02c225d4c9d3101a0271");
			post.addParameter("grant_type", "authorization_code");
			post.addParameter("client_id","c73d45b27885464" );
			post.addParameter("client_secret","0d256ffeaf57869b58b1511f57dff7f8901e1086" );
			post.addParameter("redirect_uri", "http://localhost:8080/MindPulpy/ImgurCallbackServlet");
			 
			httpclient.executeMethod(post);
		 //    String responseBody = post.getResponseBodyAsString();  i also to recieveed access token here
		
		Token accessToken = service.getAccessToken(OAuthConstants.EMPTY_TOKEN,new Verifier(code)); // this is line is issue cannot get token here so above error occur
		System.out.println("Got Token:"+responseBody);
		
		         OAuthRequest request1 = new OAuthRequest(Verb.GET,"https://api.imgur.com/3/account/%7Busername%7D/gallery_profile");
		         service.signRequest(accessToken, request1);  //
		         Response response1 = request1.send();
		         String body = response1.getBody();

		  }

[Winston Gutkowski]

Durga Roobini wrote:i have to send clientid,clientsecret,granttype,code to access token url by using POST method i tried but i got error like

Not being an OAuth expert, I honestly have no idea what you're problem is. However, there seems to be a lot of information in that error message after the "Response was:" bit, so I'd check the documentation (or Google) to see what it actually means. Clearly, it would appear that you're not providing information that the method needs though.

Also (but unrelated), I find it surprising that you're providing things like "api secret" and "client secret" as open text, because it would suggest to me that it could be easily cracked; but, as I say, I'm no OAuth expert.

Winston

PS: Your lines are far too long.

[Durga Roobini]

Winston Gutkowski wrote:

Durga Roobini wrote:i have to send clientid,clientsecret,granttype,code to access token url by using POST method i tried but i got error like

Not being an OAuth expert, I honestly have no idea what you're problem is. However, there seems to be a lot of information in that error message after the "Response was:" bit, so I'd check the documentation (or Google) to see what it actually means. Clearly, it would appear that you're not providing information that the method needs though.

Also (but unrelated), I find it surprising that you're providing things like "api secret" and "client secret" as open text, because it would suggest to me that it could be easily cracked; but, as I say, I'm no OAuth expert.

Winston

PS: Your lines are far too long.

Hi Winston,That keys are duplicate more than i neve miss any methods i gothrough the documentation after that only i start doing,if am use some other provider instead imgur,it keeps same problem,becuse am sending parameters by post method using http client,so am i struck here only please some one help to get rid of this problem