MapStruct 映射器错误：结果类型 Dto 中存在未知属性“propertyName”。您指的是“null”吗?

Question

// Driver model
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Driver {
    private String driverName;
    private String licenseNumber;
}

// Car model
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Car {
    private String make;
    private List<Driver> drivers;
    private CarType type;
}

// Car DTO
@Data
@AllArgsConstructor
@NoArgsConstructor
public class CarDto {
    private String make;
    private Integer totalDrivers;
    private String type;
}

@Mapper
public interface CarMapper {
    @Mapping(target = "totalDrivers", expression = "java(mapDrivers(car.getDrivers()))")
    CarDto mapCarDto(Car car);

    default Integer mapDrivers(List<Driver> totalDrivers) {
        return totalDrivers.size();
    }

    @InheritInverseConfiguration
    @Mapping(target = "drivers", ignore = true)
    Car mapDtoToCar(CarDto carDto);
}

当我运行这个项目时，会报告这些错误：

..\CarMapper.java
java: Unknown property "totalDrivers" in result type CarDto. Did you mean "null"?
java: Unknown property "drivers" in result type Car. Did you mean "null"?

我怎样才能解决这个问题？

Answer 1

它可能与龙目岛有关。

看一眼：

• 官方文档：我可以将 MapStruct 与 Project Lombok 一起使用吗？
  项目示例：github/mapstruct-examples/mapstruct-lombok/
• 分步指南：在 Project Lombok 中使用 Mapstruct
• StackOverflow 问题：MapStruct 和 Lombok 不能一起工作