Java中的Adwords API，OAuth2和服务帐户

Question

I have switched to the OAuth2 authentification for accessing the Adwords API. I want to use service account, because our application does not have user interaction. Therefore I created a service account in the Google APIs console for the mcc account. And used:

GoogleCredential credential = new GoogleCredential.Builder()
.setTransport(new NetHttpTransport())
.setJsonFactory(new JacksonFactory())
.setServiceAccountId("..@developer.gserviceaccount.com")
.setServiceAccountScopes("https://adwords.google.com/api/adwords/")
.setServiceAccountPrivateKeyFromP12File(file)
.setServiceAccountUser("<MCC Account Email")
.build();

to create the credentials.

When I now try to make an API call or just call credential.refreshToken() , I get :

com.google.api.client.auth.oauth2.TokenResponseException: 400 Bad Request
{
  "error" : "access_denied"
}
at com.google.api.client.auth.oauth2.TokenResponseException.from(TokenResponseException.java:105)
at com.google.api.client.auth.oauth2.TokenRequest.executeUnparsed(TokenRequest.java:303)
at com.google.api.client.auth.oauth2.TokenRequest.execute(TokenRequest.java:323)
at com.google.api.client.googleapis.auth.oauth2.GoogleCredential.executeRefreshToken(GoogleCredential.java:345)
at com.google.api.client.auth.oauth2.Credential.refreshToken(Credential.java:526)

..

Can anyone tell me, what I am doing wrong or what I have missed doing?

Answer 1

Can`t say from piece code you posted, i am using exactly same way in my app and everything works fine.

My jar versions are :

 google-api-services-oauth2-v2-rev9-1.7.2-beta.jar
 google-http-client-1.12.0-beta.jar
 google-oauth-client-1.12.0-beta.jar

if you are out of ideas try to change version of oauth2 library.