Error trying to send email using the Gmail API in Java

Question

I want to send an email using the Gmail API (not JavaMail). I read a lot of similar topics on the forums, but I still have a problem.

First I read the following: https://developers.google.com/gmail/api/guides/sending

and I impelemented methods: MimeMessage createEmail, Message createMessageWithEmail and Message sendMessage

Then I noticed that I do not have a Gmail object definition, so I need the GmailQuickstart class, which is located here: https://developers.google.com/gmail/api/quickstart/java

and I implemented: class GmailQuickstart, Credential authorize () method and Gmail getGmailService () method

Finally, I wrote some basic information:

public static void main(final String[] args) throws MessagingException, IOException {
    String APPLICATION_NAME = "gmailProject";
    HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
    JsonFactory JSON_FACTORY = new JacksonFactory();
    Credential credential = GmailQuickstart.authorize();

    String to = "[e-mail]";
    String from = "[e-mail]";
    String subject = "Subject";
    String bodyText = "Body";
    MimeMessage emailcontent = createEmail(to, from, subject, bodyText);
    createMessageWithEmail(emailcontent);
    Gmail service = new com.google.api.services.gmail.Gmail.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)
            .setApplicationName(APPLICATION_NAME).build();
    sendMessage(service, "me", emailcontent);
}

After that, I have a long list of errors:

Exception in thread "main"com.google.api.client.googleapis. json.GoogleJsonResponseException: 403 Forbidden
{
  "code" : 403,
  "errors" : [ {
  "domain" : "global",
  "message" : "Insufficient Permission",
  "reason" : "insufficientPermissions"
} ],
"message" : "Insufficient Permission"
}
    at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJs nResponseException.java:146)
    at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:113)
    at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:40)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest$1.interceptResponse(AbstractGoogleClientRequest.java:321)
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1065)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:419)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:352)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:469)
    at org.actuarlib.outsourcing.mail.Mail.sendMessage(Mail.java:78)
    at org.actuarlib.outsourcing.mail.Mail.main(Mail.java:195)

, , , . - , , API Gmail?

Answer 1

, . :

private static final List<String> SCOPES =
        Arrays.asList(GmailScopes.GMAIL_LABELS);

, , https://www.googleapis.com/auth/gmail.labels .

. SCOPES, https://mail.google.com/ , , :

private static final List<String> SCOPES =
        Arrays.asList(GmailScopes.MAIL_GOOGLE_COM);