Hibernate: Why am I getting an empty json?

Question

I have a simple entity class:

@Entity(name = "User")
@Table(name = "users")
@Data
@NoArgsConstructor
public class User {

    @Id
    @GeneratedValue
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

A repository:

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

}

A service:

@Service
public class UserService {

    private final UserRepository userRepository;

    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    public Iterable<User> findAllUsers() {
        return userRepository.findAll();
    }

    public <U extends User> void saveUser(U user) {
        userRepository.save(user);
    }
}

A controller:

@RestController
@RequestMapping("api/v1/users")
public class UserController {

    private final UserService userService;

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

    @GetMapping
    public Iterable<User> getAllUsers() {
        return userService.findAllUsers();
    }
 
    @PostMapping
    public void addUser(@RequestBody User user) {
        userService.saveUser(user);
    }
}

And a yaml file:

spring:
  datasource:
    username: "root"
    password: "123123"
    url: "jdbc:mysql://localhost:3306/mydbtest"
    driverClassName: "com.mysql.jdbc.Driver"
  jpa:
    hibernate.ddl-auto: update
    generate-ddl: true
    show-sql: true

I use MYSQL Workbench, where I have a database with one table called users. Sending a get request and trying to get all the objects from the table, I get an empty json. What should I do?

Answer 1

Your code seems ok to me . I think its your IDE issue, you have to enable Lombok annotation processing in your IDE. You can follow this link to enable it.

Answer 2

Could you add @AllArgsConstructor annotation to your entity. I think it might solve your issue. Since currently you only have @NoArgsConstructor and @RequiredArgsConstructor which comes bundled with @Data . And also you don't necessarily need the name paramenter in @Entity