java - Jpa 存储库保存类型参数 'S' 的推断类型 'S' 不在其范围内

Question

我有实体用户

@Entity
@Data
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

    private String username;

    private String password;

}

用户库

public interface UserRepository extends JpaRepository<UserRepository, Long> {
    User findByUsername(String username);
}

Controller

@RestController
@RequestMapping("/user")
public class UserController {

    private UserRepository userRepository;
    private BCryptPasswordEncoder bCryptPasswordEncoder;

    public UserController(UserRepository userRepository, BCryptPasswordEncoder bCryptPasswordEncoder) {
        this.userRepository = userRepository;
        this.bCryptPasswordEncoder = bCryptPasswordEncoder;
    }

    @PostMapping("/sign-up")
    public void signUp(@RequestBody User user) {
        user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
        userRepository.save(user);
    }
}

在类 UserController 的 signUp 方法 userRepository.save(user) 中抛出错误 Inferred type 'S' for type parameter 'S' is not within its bound;应该实现 'Repository.UserRepository

Answer 1

您的 Repository 接口(interface)声明不正确。

改变

public interface UserRepository extends JpaRepository<UserRepository, Long> 

到

public interface UserRepository extends JpaRepository<User, Long>