Tell me about your experience with Spring and Spring Boot. Rate yourself on a three-point scale.

My experience with Spring and Spring Boot is quite extensive. I have used the Spring Framework for building multi-layered applications, dependency injection, transaction management, and working with databases through Spring Data JPA. I have applied Spring Boot for rapid development of microservices with minimal configuration, utilizing auto-configuration and embedded servers.

I rate myself a 3 out of 3 on this scale, as I have experience in developing, optimizing, and maintaining applications on Spring and Spring Boot in production, and I am familiar with advanced features such as Spring Security, Actuator, and can configure complex setups.

An example of a simple REST controller in Spring Boot:

@RestController
@RequestMapping("/api/users")
public class UserController {

    private final UserService userService;

    public UserController(UserService userService) {
        this.userService = userService;
    }

    @GetMapping
    public List<User> getAllUsers() {
        return userService.findAll();
    }
}