Getting ready

To run this recipe, you can use your preferred IDE and must have Java 8 and Maven installed. It's also recommended to have CURL or Postman installed, because we will interact with the Authorization Server and Resource Server automatically without actually using any client. By running this recipe, your OAuth 2.0 Provider will be able to issue an access token for any registered client by using the Resource Owner's credentials. This recipe still does not use any kind of persistent database to store client details and tokens. The source code for this recipe can be downloaded at https://github.com/PacktPublishing/OAuth-2.0-Cookbook/tree/master/Chapter02/password-server.