Modern OAuth 2.0 with Spring Security

Modern applications no longer operate within a single trusted boundary. APIs, mobile apps, microservices, and third-party integrations all rely on secure delegated authorization. Yet OAuth 2.0 and OpenID Connect remain among the most misunderstood technologies in software development. As distributed systems and zero-trust architectures become the norm, engineers need a practical understanding of modern authorization, not just authentication. This course teaches you how to implement OAuth 2.0 and OpenID Connect correctly using Java 25, Spring Security 7, and Spring Authorization Server. I built this course from years of experience designing and teaching software systems. One challenge I repeatedly observed is that many developers learn OAuth 2.0 through outdated tutorials and oversimplified examples that fail in production environments. The result is confusion around authorization flows, tokens, clients, and security boundaries. This course replaces those shortcuts with a clear mental model that explains how delegated authorization actually works and how modern systems are secured. You'll begin by mastering the core concepts of OAuth 2.0 and OpenID Connect, including authorization servers, resource servers, token types, scopes, and claims. From there, you'll implement the authorization code flow with PKCE, understand why legacy grants have been deprecated, and build a centralized authorization server with secure key management. You'll also configure stateless resource servers, validate JWTs, map custom claims to Spring Security authorities, enforce strict CORS policies, and test your security architecture using modern Spring testing practices. Thousands of engineers use Educative to learn the technologies behind modern software systems. If you're building APIs, microservices, or cloud native applications with Spring, this course will give you a production-ready framework for implementing authorization securely and confidently.