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ADC vs Service Account for OAuth2 token - Server to Server request

Posted on 04-12-2024 12:03 PM
sivas
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Hello,

   I am trying to access Google Cloud resources (VMs, Storage buckets) from my project using REST APIs, for which I need OAuth2 token. I can obtain those programmatically (Java) using ADC credentials and Service Account Credentials. 

   The issue i run into when using ADC credentials is, that i need to re-authenticate every day using "gcloud auth application-default login" to get a new refresh_token. Otherwise, I receive "invalid_grant" error.  That command needs to be run from CLI.  Is there a Java SDK/REST API corresponding to the CLI command "gcloud auth application-default login" ?

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