JHipster web应用程序中的Mapstruct生成的类不是由Spring注入的

import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.factory.Mappers;

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

    @Mapping(source = "firstName", target = "name")
    UserDTO userToUserDTO(User user);
}

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MapStructConfig {

    @Bean
    public UserMapper userMapper() {
        return Mappers.getMapper(UserMapper.class);
    }
}

public class User {
    private Long id;
    private String firstName;
    private String lastName;
    // getters and setters
}

public class UserDTO {
    private Long id;
    private String name;
    // getters and setters
}

import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.factory.Mappers;

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

    @Mapping(source = "firstName", target = "name")
    UserDTO userToUserDTO(User user);
}

import org.springframework.stereotype.Service;

@Service
public class UserService {

    private final UserMapper userMapper = UserMapper.INSTANCE;

    public UserDTO getUserDTO(User user) {
        return userMapper.userToUserDTO(user);
    }
}