Write to GoogleSheet via API with Java

Question

I am trying to write a value to a cell with Google Sheet API with Java. For reading I used guide from Java Quickstart which worked fine for me.

For writing to Google

Answer 1

The Java API must be used in an interactive way, if you're running this on a server that can't pop up a web-browser (which will let you approve an OAuth dialog), then the authentication flow doesn't get proper credentials and won't work.

While running this, do you see a browser pop up to approve an OAuth dialog? If not, you're likely running in a headless session and will need some other means to get the user's credentials.