如何在PatchMapping中使用mapStruct？

<dependency>
    <groupId>org.mapstruct</groupId>
    <artifactId>mapstruct</artifactId>
    <version>1.4.2.Final</version>
</dependency>

@Mapper
public interface UserMapper {
    UserMapper INSTANCE = Mappers.getMapper(UserMapper.class);

    void updateUserFromDto(UserDto userDto, @MappingTarget User user);
}

@RestController
@RequestMapping("/users")
public class UserController {
    @Autowired
    private UserRepository userRepository;

    @PatchMapping("/{id}")
    public ResponseEntity<Void> updateUser(@PathVariable Long id, @RequestBody UserDto userDto) {
        User user = userRepository.findById(id).orElseThrow(() -> new NotFoundException("User not found with id: " + id));
        UserMapper.INSTANCE.updateUserFromDto(userDto, user);
        userRepository.save(user);
        return ResponseEntity.ok().build();
    }
}