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Keycloak is an open-source identity and access management tool that simplifies authentication and authorization in applications. When you combine Keycloak with Spring Boot and OpenID Connect (OIDC), you can easily set up role-based access control (RBAC) to secure your application.

In your Spring Boot project, add the necessary dependencies for Spring Security and OAuth 2.0. Configure your application to connect to Keycloak by providing the Keycloak server URL, realm, client ID, and client secret in your application.properties or application.yml file. With this setup, Spring Security handles the authentication process, redirecting users to Keycloak for login.Once logged in, users are redirected back to your application, where Spring Security checks their roles. Based on these roles, you can restrict or grant access to specific parts of your application, ensuring that only authorized users can access sensitive areas.