Mastering Spring Security: A Comprehensive Guide to Authentication, Authorization, OAuth2, and JWT for Modern Java Applications

Welcome, vigilant developers and guardians of data! In today’s interconnected world, security is not just a feature; it’s the bedrock of trust for any application. For Java developers building with Spring Boot, Spring Security is the undisputed champion for handling authentication and authorization. But let’s be honest: while incredibly powerful, it can sometimes feel like navigating a complex maze, especially with the advent of modern paradigms like REST APIs, OAuth2, and JSON Web Tokens (JWT).