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Ankit Kumar commented on OLTU-151: ---------------------------------- This bug is invalid or had been fixed in the latest release. While fetching an access token using GOOGLE as provider type and AUTHORIZATION_CODE flow, OAuthJSONAccessTokenResponse class should be used to map the response from server. Finally, I was able to use the following code to successfully retrieve an access token from Google: OAuthClientRequest request = OAuthClientRequest .tokenProvider(OAuthProviderType.GOOGLE) .setGrantType(GrantType.AUTHORIZATION_CODE) .setClientId("my_client_id") .setClientSecret("my_client_secret") .setRedirectURI("registered_redirect_uri").setCode(code) .buildBodyMessage(); URLConnectionClient oAuthClient = new URLConnectionClient(); OAuthJSONAccessTokenResponse response = oAuthClient.execute(request, null, HttpMethod.POST, OAuthJSONAccessTokenResponse.class); System.out.println("Access token:" + response.getAccessToken()); No invalid_request error was received from google. Hope this helps. > URLClientConnection HTTP POST not encoded in entity body > -------------------------------------------------------- > > Key: OLTU-151 > URL: https://issues.apache.org/jira/browse/OLTU-151 > Project: Apache Oltu > Issue Type: Bug > Components: oauth2-client > Affects Versions: oauth2-1.0.0 > Environment: Windows 7 x64, JDK1.8 > Reporter: Allan Cheong Tyng Huei > > Code: > final String code = "this-is-an-authorization-code"; > OAuthClientRequest request = > OAuthClientRequest.tokenProvider(OAuthProviderType.GOOGLE).setClientId(clientId).setClientSecret(secret).setRedirectURI("http://www.example.com/redirect").setCode(code).setGrantType(GrantType.AUTHORIZATION_CODE).buildQueryMessage(); > URLConnectionClient urlConnectionClient = new URLConnectionClient(); > OAuthResourceResponse response = urlConnectionClient.execute(request, null, > HttpMethod.POST, OAuthResourceResponse.class); > Response: > { > "error": "invalid_request", > "error_description": "Required parameter is missing: grant_type" > } -- This message was sent by Atlassian JIRA (v6.3.4#6332)