Mapstruct 1.4.2。最终：NullValuePropertyMappingStrategy。将_设置为_默认值未按预期工作

Question

我最近更新了我的Spring启动版本从2.3.0。发布到2.4.4，还更新了地图结构版本从1.3.1到最新版本。最终版本是1.4.2。最终版本。使用的lombok版本-1.18.18

但是其中一个在1.3.1上运行良好的映射器在1.4.2上不再工作，场景如下。

POM：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.4</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    ......

    <properties>
        <!-- used for configuration meta data processor, please keep in sync with 
            spring boot parent version -->
        <spring-boot.version>2.4.4</spring-boot.version>
        <java.version>11</java.version>
        <org.mapstruct.version>1.3.1.Final</org.mapstruct.version>
        .....
    </properties>

    <dependencies>
        ........
        ........
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct</artifactId>
            <version>${org.mapstruct.version}</version>
        </dependency>
        ........
        ........
    </dependencies>

    <build>
        <finalName>dras_mt</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <annotationProcessorPaths>
                        <path>
                            <groupId>org.mapstruct</groupId>
                            <artifactId>mapstruct-processor</artifactId>
                            <version>${org.mapstruct.version}</version>
                        </path>
                        <path>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                            <version>${lombok.version}</version>
                        </path>
                        <path>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok-mapstruct-binding</artifactId>
                            <version>0.2.0</version>
                        </path>
                        ........
                        ........
                    </annotationProcessorPaths>
                </configuration>
            </plugin>
            ......
            ......
        </plugins>
        <pluginManagement>
            .....
        </pluginManagement>
    </build>
</project> 

实体：

@Entity
@Data
public class TestEntity {
    @Id
    private Long id;

    @NotNull
    private String plntId;

    @NotNull
    private Boolean approvalNeeded = false;
}

域名：

@Value
@Builder(toBuilder = true)
public class TestDomain {
    private PlantDomain plantDomain;

    @NonFinal
    @Setter
    private SomeInfo someInfo;

    @NonFinal
    @Setter
    @Default
    private Boolean approvalNeeded = false;
}

制图员：

@Mapper(componentModel = "spring", uses = { ActaulPlantMapper.class })
public interface TestEntityMapper {
    @Mapping(target = "someInfo", ignore = true)
    @Mapping(source = "plntId", target = "plantDomain")
    @Mapping(target = "approvalNeeded", nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.SET_TO_DEFAULT)
    TestDomain fromEntity(TestEntity entity);    
}

使用MapStruct 1.3.1生成的代码

@Generated(
    value = "org.mapstruct.ap.MappingProcessor",
    date = "2021-03-24T11:33:38+0530",
    comments = "version: 1.3.1.Final, compiler: javac, environment: Java 11.0.9.1 (AdoptOpenJDK)"
)
@Component
public class TestEntityMapperImpl implements TestEntityMapper {

    @Autowired
    private ActualPlantMapper actualPlantMapper;

    @Override
    public TestDomain fromEntity(WareHouseOptionEntity entity) {
        if ( entity == null ) {
            return null;
        }    
        TestDomainBuilder testDomain = TestDomain.builder();
        testDomain.plantDomain( actualPlantMapper.fromSapId( entity.getPlntId() ) );
        if ( entity.getApprovalNeeded() != null ) {
            testDomain.approvalNeeded( entity.getApprovalNeeded() );
        }
        else {
            testDomain.approvalNeeded( false );
        }    
        return testDomain.build();
    }
}

用Map结构1.4.2生成代码

@Generated(
    value = "org.mapstruct.ap.MappingProcessor",
    date = "2021-03-24T11:33:38+0530",
    comments = "version: 1.3.1.Final, compiler: javac, environment: Java 11.0.9.1 (AdoptOpenJDK)"
)
@Component
public class TestEntityMapperImpl implements TestEntityMapper {

    @Autowired
    private ActualPlantMapper actualPlantMapper;

    @Override
    public TestDomain fromEntity(WareHouseOptionEntity entity) {
        if ( entity == null ) {
            return null;
        }    
        TestDomainBuilder testDomain = TestDomain.builder();
        testDomain.plantDomain( actualPlantMapper.fromSapId( entity.getPlntId() ) );            
        testDomain.approvalNeeded( entity.getApprovalNeeded() );               
        return testDomain.build();
    }
}

正如您在1.4.2版本中看到的，NullValue财产映射策略。SET_TO_DEFAULT没有应用。

我尝试过其他选项，比如将NullValuePropertyMappingStrategy放在类级别，但没有起到任何作用。

任何进一步的投入都是高度评估的。

Answer 1

事实上，NullValue属性映射策略在1.3上工作是一个巧合。该策略应该只适用于更新方法，即具有@MappingTarget的方法。

如果你想保持源代码类中定义的默认值，我建议使用NullValueCheckStrategy#ALWAYS