401 Unauthorized Error when trying to read corporative emails in Gsuite from a Gmail account using Account Service

Question

I´m having a problem to read emails in a corporative Gmail account, specifically a Gsuite Gmail account.

I followed this steps already:

• Go to the Google API Console.
• Create a new Project.
• Create a new Service Account
• Get the private key in p12 format
• Allow G Suite Domain-Wide Delegation of Authority to the Service Account.
• Go to the Gsuite Admin Panel.
• Go to the Security Section
• Allow the Email Scope(Read/Write/Send) https://mail.google.com/ to the Service Account.
• I made the following code: (https://developers.google.com/admin-sdk/reports/v1/guides/delegation) using the private p12 key. Here is the code: https://gist.github.com/sebastianmorenoe/40c16c1bb3420b27917d2dc58eb385f0

Unfortunately I'm receiving this error: com.google.api.client.auth.oauth2.TokenResponseException: 401 Unauthorized

Thank you very much for any help that you can provide.

Greetings

Answer 1

It was a problem with the maven dependencies.

Using these dependencies solved the problem.

<dependency>
    <groupId>com.google.api-client</groupId>
    <artifactId>google-api-client</artifactId>
    <version>1.23.0</version>
</dependency>

<dependency>
    <groupId>com.google.oauth-client</groupId>
    <artifactId>google-oauth-client-jetty</artifactId>
    <version>1.23.0</version>
</dependency>

<dependency>
    <groupId>com.google.apis</groupId>
    <artifactId>google-api-services-gmail</artifactId>
    <version>v1-rev73-1.23.0</version>
</dependency>