@MAPSTRUCT。源参数中不存在名为“packaging”的属性

Question

我正在MVC REST用Spring Boot和编写一个应用程序Hibernate。我决定DTO使用MAPSTRUCT. 看来我按照指南做了一切，但出现了错误。有什么问题，我无法理解。论坛和google上的信息很少。

PS 起初我以为问题出在Lombok，所以我删除Lombok并手动分配getters / setters。然后问题并没有解决。我在Drink课堂上和DrinkDTO我规定的课程中都参加了getters / setters。但这仍然没有帮助。

喝：

@Entity
@Table(name = "drink", schema = "public")
public class Drink {

    public Drink() { // Constructor for Hibernate

    }


    // Fields
    //
    private @Id
    @GeneratedValue
    Long id;

    @Column(name = "name")
    private String name;

    @Column(name = "price")
    private float price;

    @Column(name = "about")
    private String about;

    @Column(name = "is_deleted")
    private boolean isDeleted;

    // Relationships
    //
    @ManyToOne
    @JoinColumn(name = "packaging_id")
    private Packaging packaging;

    @ManyToOne
    @JoinColumn(name = "manufacturer_id")
    private Manufacturer manufacturer;

    @ManyToOne
    @JoinColumn(name = "country_id")
    private Countries countries;
}

喝DTO：

public class DrinkDTO {

    // Fields
    //
    private String drinkName;

    private float drinkPrice;

    private String drinkAbout;

    private Packaging drinkPackaging;

    private Manufacturer drinkManufacturer;

    private Countries drinkCountries;


    // Getters and Setters
    //
    public String getDrinkName() {
        return drinkName;
    }

    public void setDrinkName(String drinkName) {
        this.drinkName = drinkName;
    }

    public float getDrinkPrice() {
        return drinkPrice;
    }

    public void setDrinkPrice(float drinkPrice) {
        this.drinkPrice = drinkPrice;
    }

    public String getDrinkAbout() {
        return drinkAbout;
    }

    public void setDrinkAbout(String drinkAbout) {
        this.drinkAbout = drinkAbout;
    }

    public Packaging getDrinkPackaging() {
        return drinkPackaging;
    }

    public void setDrinkPackaging(Packaging drinkPackaging) {
        this.drinkPackaging = drinkPackaging;
    }

    public Manufacturer getDrinkManufacturer() {
        return drinkManufacturer;
    }

    public void setDrinkManufacturer(Manufacturer drinkManufacturer) {
        this.drinkManufacturer = drinkManufacturer;
    }

    public Countries getDrinkCountries() {
        return drinkCountries;
    }

    public void setDrinkCountries(Countries drinkCountries) {
        this.drinkCountries = drinkCountries;
    }

    // toSTRING
    @Override
    public String toString() {
        return "DrinkDTO{" +
                "drinkName='" + drinkName + '\'' +
                ", drinkPrice=" + drinkPrice +
                ", drinkAbout='" + drinkAbout + '\'' +
                ", drinkPackaging=" + drinkPackaging +
                ", drinkManufacturer=" + drinkManufacturer +
                ", drinkCountries=" + drinkCountries +
                '}';
    }

客户控制器：

@GetMapping("/drinks")
    List<DrinkDTO> getAllDrinks(){
        return DrinkMapper.INSTANCE.drinksToDrinksDTO(customerService.getAllDrinks());
    }

构建.Gradle

// Mapstruct
    implementation 'org.mapstruct:mapstruct:1.3.1.Final'
    annotationProcessor 'org.mapstruct:mapstruct-processor:1.3.1.Final'

饮料映射器：

@Mapper
public interface DrinkMapper {

    DrinkMapper INSTANCE = Mappers.getMapper(DrinkMapper.class);

    @Mapping(source = "name", target = "drinkName")
    @Mapping(source = "price", target = "drinkPrice")
    @Mapping(source = "about", target = "drinkAbout")
    @Mapping(source = "packaging", target = "drinkPackaging")
    @Mapping(source = "manufacturer", target = "drinkManufacturer")
    @Mapping(source = "countries", target = "drinkCountries")
    DrinkDTO drinkToDrinkDTO(Drink drink);

    @Mapping(source = "drinkName", target = "name")
    @Mapping(source = "drinkPrice", target = "price")
    @Mapping(source = "drinkAbout", target = "about")
    @Mapping(source = "drinkPackaging", target = "packaging")
    @Mapping(source = "manufacturer", target = "drinkManufacturer")
    @Mapping(source = "countries", target = "drinkCountries")
    Drink drinkDTOtoDrink(DrinkDTO drinkDTO);

    @Mapping(source = "name", target = "drinkName")
    @Mapping(source = "price", target = "drinkPrice")
    @Mapping(source = "about", target = "drinkAbout")
    @Mapping(source = "packaging", target = "drinkPackaging")
    @Mapping(source = "manufacturer", target = "drinkManufacturer")
    @Mapping(source = "countries", target = "drinkCountries")
    List<DrinkDTO> drinksToDrinksDTO(List<Drink> drinks);
}

错误：

Answer 1

mapstruct对于那些在使用+时遇到同样问题的人lombok：

我遇到过同样的问题。原因是我Lombok也一直在使用插件。无需删除它，但您必须确保 in inpom.xml Lombok<annotationProcessorPaths>标记位于 Mapstruct 标记之前。

示例（pom.xml 文件的一部分）：

<build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.1</version>
                    <configuration>
                        <source>${java.version}</source>
                        <target>${java.version}</target>
                        <encoding>${project.build.sourceEncoding}</encoding>
                        <annotationProcessorPaths>
                            <path>
                                <groupId>org.projectlombok</groupId> <!-- IMPORTANT - LOMBOK BEFORE MAPSTRUCT -->
                                <artifactId>lombok</artifactId>
                                <version>${lombok.version}</version>
                            </path>
                            <path>
                                <groupId>org.mapstruct</groupId>
                                <artifactId>mapstruct-processor</artifactId>
                                <version>${org.mapstruct.version}</version>
                            </path>
                        </annotationProcessorPaths>
                    </configuration>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>

Answer 2

只是为了添加@Jakub S\xc5\x82owikowski 答案，gradle 依赖项也会发生同样的情况。以下命令导致了错误：

\n

dependencies {    \n...\nannotationProcessor("org.mapstruct:mapstruct-processor:${mapstructVersion}")\n\nannotationProcessor("org.projectlombok:lombok:${lombokVersion}")\n...\n}\n

\n

因此我被迫改变顺序：

\n

dependencies {    \n...\nannotationProcessor("org.projectlombok:lombok:${lombokVersion}")\n    \nannotationProcessor("org.mapstruct:mapstruct-processor:${mapstructVersion}")\n...\n}\n

\n

Answer 3

该错误来自于您尝试从List<>对象映射属性，但这些属性不存在。Mapstruct 足够智能，可以在列表之间生成映射器，前提是它知道如何映射列表内的元素。

因此，您不需要@Mapping在列表到列表映射上指定注释。Mapstruct会自动使用drinkToDrinkDTO映射方法。

@Mapping(...)
DrinkDTO drinkToDrinkDTO(Drink drink);

List<DrinkDTO> drinksToDrinksDTO(List<Drink> drinks);