Download Keycloak, start the server locally, and log in with the admin/admin credentials. Support initial login and admin access in a development setup for integrating Keycloak with Spring Boot 3.

Begin on localhost 8080, navigate to create realm, and name the new realm Hogwarts, kicking off the Keycloak integration workflow for Spring Boot 3.

Configure a new client in Keycloak by creating a client with id Springboot App, enabling client authentication and authorization, and setting the root URL to localhost 9090 in Hogwarts realm.

Create new roles in the Keycloak realm by navigating to realm roles and adding a user role and an admin role.

Create two new users in Keycloak, verify their emails, set permanent passwords, and map the admin role to one user for a Spring Boot 3 integration.

Create a spring boot app using spring initializr with a maven project and starter web, import into IntelliJ, and configure a yaml application for keycloak integration at port 1990.

Test Keycloak authentication with Postman by using the password credentials grant, configuring the token endpoint, client id, and secret to generate an access token from a simulated user login.

Integrate Spring Boot 3 with Keycloak by configuring dependencies, application YAML, and security rules; map realm roles to Spring authorities with a custom converter and authorize endpoints based on roles.

Demonstrates authentication and authorization in a Spring Boot 3 project with Keycloak, exposing endpoints for everyone, users, and admins, and explaining role-based access and granted authorities.

Download, install, run Keycloak locally, then log in and create realms, clients, roles, users. Integrate Spring Boot 3 with Keycloak, adjust security, build secure endpoints, and test with Postman.