I have been stuck at "Deploy to APP Engine" from Eclipse, and following error message always popped up. Possible actions what I can think of were taken but all failed. Here is my situation what I have right now. Application(Java Servlet) run normally in debug level "Deploy to App Engine" from Eclipse was working fine in 2018 around Available software

com.google.api.client.auth.oauth2.TokenResponseException: 400 Bad Request (Eclipse)

I have been stuck at “Deploy to APP Engine” from Eclipse, and following error message always popped up. Possible actions what I can think of were taken but all failed.

An error occurred while retrieving projects: com.google.api.client.auth.oauth2.TokenResponseException: 400 Bad Request
{
  "error" : "invalid_grant",
  "error_description" : "Bad Request"
}
com.google.api.client.auth.oauth2.TokenResponseException: 400 Bad Request
{
  "error" : "invalid_grant",
  "error_description" : "Bad Request"
}

Here is my situation what I have right now.

Application(Java Servlet) run normally in debug level
“Deploy to App Engine” from Eclipse was working fine in 2018 around
Available software have been up to date
I followed instruction of Java 8 Deploy manual (Google), and re-init the project and authenticated my account successfully https://cloud.google.com/appengine/docs/standard/java/building-app/environment-setup?hl=ja

Does anyone help me to solve this problem? I want to deploy my application to the Google Cloud Platform.

Answer

I cloud resolve this problem by signing out and back into the Google Plugin for Eclipse. The OAuth tokens had been expired since I kept logged in my google account in 2018.

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Answer