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Editorial Team
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Asked: 2026-06-16T01:58:46+00:00

I need to make a Java application that stores calendar events in employees within

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I need to make a Java application that stores calendar events in employees within a Google Domain.
I created the application based on a sample I found on http://code.google.com/p/google-api-java-client/wiki/APIs#Calendar_API

Now I wanted to make it work on an account from the google domain and suddenly I’m stuck.
I changed the client_secrets.json file with a new one. generated on code.google.com/apis/console for an installed application and now I get a invalid client error:

ex = (com.google.api.client.auth.oauth2.TokenResponseException) com.google.api.client.auth.oauth2.TokenResponseException: 400 Bad Request
{
“error” : “unauthorized_client”
}

Do I need to do other steps for this? Also it needs to work on all accounts by default within the domain not the single account. Maybe other console? I hope not an other library.

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1 Answer

  1. Editorial Team

    To have access to all accounts in the domain, you need to use a service account:

    https://developers.google.com/accounts/docs/OAuth2ServiceAccount

    while this link is specific to Drive API, it should give you some code samples that are easily adaptable to Calendar API v3:

    https://developers.google.com/drive/delegation

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