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Introduction We’ve all been there. You add spring-boot-starter-security to your project, the app restarts, and suddenly—magic!—you have a login form. But what just happened? For many developers, Spring Security feels like a "black box." You paste som...

Modern Spring applications work smoothly not because of magic, but because of two foundational principles: Inversion of Control (IoC) and Dependency Injection (DI). Understanding these properly changes how you design Java applications. What Is Invers...
