Spring Boot FAQ: Top Questions

All three annotations are used to mark a class as a Spring-managed component. The difference lies in their semantics and usage.

📘 Breakdown:

• @Component: Generic stereotype for any Spring-managed component.
• @Service: Used in service layer for business logic.
• @Repository: Used in persistence layer, supports exception translation.

📥 Example:

@Service
public class UserService {}

@Repository
public interface UserRepository extends JpaRepository<User, Long> {}

🏆 Expected Output:

Beans registered and auto-wired in the Spring context.

🛠️ Use Cases:

• Clear layering of application structure.
• Separation of concerns.