How to get access token from GoogleCredential?
Got it. You have to call credential.refreshToken() before credential.getAccessToken(). It doesn't say this anywhere in the documentation but that's what does it.
credential.refreshToken();
accessToken = credential.getAccessToken();
If you use ServiceAccountCredentials.fromStream()
to create your credential object, you may have to call the createScoped()
method too.
FileInputStream fileInputStream = new FileInputStream(KEY_FILE_PATH);
GoogleCredentials credentials = ServiceAccountCredentials.fromStream(fileInputStream);
credentials = credentials.createScoped(SCOPES);
AccessToken accessToken = credentials.refreshAccessToken();
Otherwise you get the error
java.io.IOException: Scopes not configured for service account. Scoped should be specified by calling createScoped or passing scopes to constructor.