Can't create a hangoutsMeet with calendar API using Java

here is the code.

private static Credential authorize() throws Exception {
    HttpTransport httpTransport = GoogleNetHttpTransport.newTrustedTransport();
    JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();
    InputStream in = ModuloCalendar.class.getResourceAsStream("quickstart-1585944958709-f0acf97c5fa8.json");  
	  
    Collection<String> scopes  = CalendarScopes.all();
	  
    GoogleCredential credential = GoogleCredential.fromStream(in).createScopes(scopes);
    return credential;
}

Calendar entry = new Calendar();
entry.setSummary(descripcion);

ConferenceProperties conferenceProperties=new ConferenceProperties();

List<String> allowedConferenceSolutionTypes = new ArrayList<String>();

allowedConferenceSolutionTypes.add("hangoutsMeet");

conferenceProperties.setAllowedConferenceSolutionTypes(allowedConferenceSolutionTypes);

entry.setConferenceProperties(conferenceProperties);
View.display(entry);

Calendar result = client.calendars().insert(entry).execute();
View.display(result);

I have done steps on https://developers.google.com/identity/protocols/oauth2/service-account

it create the calendar, but it's always return
"allowedConferenceSolutionTypes":["eventHangout"]

Not hangoutsMeet

Answer:

As Service accounts are not part of your domain, they can not create calendars that they own with a conferenceSolution of hangoutsMeet.

More Information:

It took me a little while to understand this but, as per the documentation for the Events resource of the Calendar API, the conference solution types are as follows:

> - "eventHangout": for Hangouts for consumers (http://hangouts.google.com)
>
> - "eventNamedHangout": for classic Hangouts for G Suite users (http://hangouts.google.com)
>
> - "hangoutsMeet": for Hangouts Meet (http://meet.google.com)
>
> - "addOn": for 3P conference providers

And from the Google Cloud Service Account documentation:

> Service accounts are not members of your G Suite domain, unlike user accounts. For example, if you share assets with all members in your G Suite domain, they will not be shared with service accounts. Similarly, any assets created by a service account cannot be owned or managed by G Suite admins.

What you're experiencing is a result of this: a Service Account is not part of your domain, and therefore can not create a calendar for itself that has the hangoutsMeet value for the Conference Solution Type.

If you wish the Calendar to have this conference solution type, you must create the calendar such that it is owned by a member of your G Suite domain; that is to say, have the service account create a calendar impersonating as a member of your G Suite domain.

The reason you are getting the correct result from the Try this API feature of Calendars: insert is because the API call is being authorised as you - a G Suite domain user.

Building the Service Account credentials:

When you're doing your authentication you need to set the user that you wish to impersonate before building:

GoogleCredential.Builder b = new GoogleCredential.Builder()
 .setTransport(httpTransport)
 .setJsonFactory(jacksonFactory)
 .setServiceAccountId(serviceAccountId)
 .setServiceAccountPrivateKey(yourPrivateKey)
 .setServiceAccountScopes(scopes)
 //the user whom you want to impersonate here:
 .setServiceAccountUser(email-to-impersonate);

credential = b.build();

return credential;

Or with pk12 file:

GoogleCredential.Builder b = new GoogleCredential.Builder()
 .setTransport(httpTransport)
 .setJsonFactory(jsonFactory)
 .setServiceAccountId(serviceAccountId)
 .setServiceAccountPrivateKeyFromP12File(pk12)
 .setServiceAccountScopes(scopes)
 //the user whom you want to impersonate here:
 .setServiceAccountUser(email-to-impersonate);

credential = b.build();

return credential;

References:

• Calendars: insert | Google Calendar API | Google Developers
• Events | Calendar API | Google Developers
• Understanding service accounts | Cloud IAM Documentation
• Service accounts | Cloud IAM Documentation | Google Cloud