Setting up Google OAuth2 with Java

For all of you who are trying to figure out how to integrate with Google’s single sign-on functionality, this article might be for you. I’ve taken the liberty of condensing all of the actual logic required to perform OAuth Google login, and provided it as a class and a JSP (seen below). In order to follow along better, I suggest cloning the example GitHub repository, and deploying to the application to your server of choice.