Guide to OAuth, OpenID Connect, and Keycloak with Spring Boot

Modern application security requires robust identity and access management, but setting up secure authentication can feel overwhelming. This course simplifies the complexities of identity federation, token validation, and multi-provider integration. You will transition from understanding basic security concepts to configuring production-ready identity solutions. By reading through clear, step-by-step explanations and analyzing structured code snippets, you will gain the confidence to implement secure user authentication and authorization across enterprise environments. What you'll learn: - Understand the foundational architecture of OAuth, OpenID Connect (OIDC), and JSON Web Tokens (JWT). - Configure Keycloak as a centralized identity provider to manage users, roles, and client applications. - Implement identity brokering to allow users to sign in using social providers like GitLab and external identity systems. - Secure Spring Boot applications using modern Spring Security patterns and token validation. - Manage multiple identity providers simultaneously to support diverse user bases. - Apply modern security practices including zero-trust principles and secure token transmission. The journey begins with foundational terminology and identity concepts before moving into Keycloak configuration and multi-provider integration. You will then explore how to connect these identity systems to backend services using modern Spring frameworks. This course is designed for developers, security enthusiasts, and backend engineers who want to learn secure authentication from scratch. No prior experience with Keycloak or OAuth is required, though a basic understanding of Java and web development is helpful. Start reading today to build a secure foundation for your application architecture.