sheets api error access denied exception desp Requested client not authorized - google-api

Question

Hi I am using Google apis.. I have successfully able to access google drive and google calendar but when i try to access google spreadsheet i am getting following exception.
Exception in thread "main" com.google.gdata.util.AuthenticationException: Failed to refresh access token: 403 Forbidden
{
"error" : "access_denied",
"error_description" : "Requested client not authorized."
}
Caused by: com.google.api.client.auth.oauth2.TokenResponseException: 403 Forbidden
{
"error" : "access_denied",
"error_description" : "Requested client not authorized."
}
My code is as follows
private static Credential authorize() throws Exception {
HttpTransport httpTransport = GoogleNetHttpTransport.newTrustedTransport();
JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();
String SERVICE_ACCOUNT_EMAIL = "xxx#developer.gserviceaccount.com";
List<String> SCOPES = Arrays.asList("https://spreadsheets.google.com/feeds/");
GoogleCredential credential = new GoogleCredential.Builder().setTransport(httpTransport)
.setJsonFactory(jsonFactory).setServiceAccountId(SERVICE_ACCOUNT_EMAIL).setServiceAccountScopes(SCOPES)
.setServiceAccountPrivateKeyFromP12File(
new java.io.File("xxx.p12"))
.setServiceAccountUser("xx#zzz.com")
.build();
return credential;
}
public static void main(String[] args) throws Exception {
Credential credential = authorize();
SpreadsheetService service = new SpreadsheetService("new data service ");
service.setProtocolVersion(SpreadsheetService.Versions.V3);
service.setOAuth2Credentials(credential);
// Define the URL to request. This should never change.
URL SPREADSHEET_FEED_URL = new URL(
"https://spreadsheets.google.com/feeds/spreadsheets/private/full");
// Make a request to the API and get all spreadsheets.
SpreadsheetFeed feed = service.getFeed(SPREADSHEET_FEED_URL, SpreadsheetFeed.class);
List<SpreadsheetEntry> spreadsheets = feed.getEntries();
// Iterate through all of the spreadsheets returned
for (SpreadsheetEntry spreadsheet : spreadsheets) {
// Print the title of this spreadsheet to the screen
System.out.println(spreadsheet.getTitle().getPlainText());
}
}
Thanks

Answer 1

I was only passing the spreadsheet scope, I have to pass both drive and sheet scope. Now I am able to read spreadsheets from drive.. Here is the corrected code.
String SERVICE_ACCOUNT_EMAIL = "xxxx#developer.gserviceaccount.com";
ArrayList<String> scopes = new ArrayList<String>();
scopes.add(0, DriveScopes.DRIVE);
scopes.add(1, "https://spreadsheets.google.com/feeds");
GoogleCredential credential = new GoogleCredential.Builder().setTransport(httpTransport)
.setJsonFactory(jsonFactory).setServiceAccountId(SERVICE_ACCOUNT_EMAIL).setServiceAccountScopes(scopes)
.setServiceAccountPrivateKeyFromP12File(
new java.io.File("xx.p12"))
.setServiceAccountUser("yyy#example.com")
.build();