Lock down your Spring Boot 3 REST API! Learn Role-Based Access Control (RBAC) with JWT, step-by-step.
💻 Go beyond authentication and implement a robust authorization system to control what your users can do.

In this tutorial, we build upon our JWT authentication system to add a critical layer of security. You'll learn how to secure specific endpoints so they are only accessible to users with certain roles (like 'ADMIN').

🛠️ In this step-by-step guide, you will learn how to:

🧱 Create a Role entity and establish a Many-to-Many relationship with your User entity using Spring Data JPA.
🧠 Update your UserDetailsService to dynamically load a user's roles as GrantedAuthority objects.
✨ Add role information as a custom claim to your JWT payload.
🛡️ Configure SecurityConfig to restrict URL patterns (e.g., /api/v1/admin/**) using .hasRole("ADMIN").
⚙️ Implement a JwtAuthenticationConverter to correctly parse roles from the incoming JWT for authorization decisions.
🧪 Thoroughly test your RBAC setup with Postman
🐛 Debug common issues related to role prefixing and JWT claims.


💻 Technologies Covered:
Java ☕
Spring Boot 3 🌱
Spring Security (for JWT & RBAC)
Spring Data JPA
MySQL 🐬
JSON Web Tokens (JWT)
Postman 📮

🧑‍💻 Who is this tutorial for?
Java developers looking to implement real-world authorization in their APIs.
Anyone who has built a JWT authentication system and wants to take the next step.
Developers wanting to understand how to secure endpoints based on user roles.

💡 What's Next?
We've now secured our URL patterns. But what if you need even more fine-grained control, like securing individual methods in your service layer?

➡️ In our next tutorial, we will explore Method-Level Security in Spring Boot!

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#java #springboot #rbac #jwt #userrole #rolebasedaccesscontrol #springsecurity