MapStruct的不同实现：mvn安装与运行。

Question

我有一个Spring Boot 2.2的项目，我使用的是MapStruct 1.3.1和Lombook 1.18.12。我使用MapStruct 1.3.1和Lombook 1.18.12。

我有这些模型。

@EntityListeners({AuditingEntityListener.class})
@MappedSuperclass
@Data
@EqualsAndHashCode(onlyExplicitlyIncluded = true)
@AllArgsConstructor
@NoArgsConstructor
@SuperBuilder
public abstract class AbstractEntity implements Persistable<Long>, Serializable {

//stuff
}

+

@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "type")
@DiscriminatorValue(value = "AuditLog")
@EntityListeners(AuditLogListener.class)
@NoArgsConstructor
@SuperBuilder
@Data
@EqualsAndHashCode(callSuper = true, onlyExplicitlyIncluded = true)
public class AuditLog extends AbstractEntity {
//stuff
}

+

@Entity
@DiscriminatorValue(value = "AuditCdr")
@Data
@SuperBuilder
@EqualsAndHashCode(callSuper = true, onlyExplicitlyIncluded = true)
public class AuditCdr extends AuditLog {

    @Size(max = 30)
    private String from;

    @Size(max = 30)
    private String to;

    @Enumerated(EnumType.STRING)
    @Size(max = 50)
    private CallType callType;

    private Instant startDate;

    private Instant endDate;

    public AuditCdr() {
        setOperationType(AuditType.CDR);
    }
}

我创建了这个DTO。

@Data
@Builder
public class Cdr3CXDto {

    String from;

    String to;

    String type;

    String startDate;

    String endDate;

    Long contactId;
}

和这个映射器。

@Mapper(componentModel = "spring")
public interface Cdr3CXMapper {


    @ValueMappings({
            @ValueMapping(source = "Inbound", target = "INBOUND"),
            @ValueMapping(source = "Outbound", target = "OUTBOUND"),
            @ValueMapping(source = "Missed", target = "MISSED"),
            @ValueMapping(source = "Notanswered", target = "NOT_ANSWERED")
    })
    @Mapping(source = "contactId", target = "parentId")
    @Mapping(source = "type", target = "callType")
    AuditCdr cdr3CXDtoToAuditCdr(Cdr3CXDto cdr3CXDto);
}

这是我在pom.xml中的相关部分。

<plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <annotationProcessorPaths>
                        <path>
                            <groupId>org.projectlombok</groupId>
                            <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>

我还添加了依赖关系。

<dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct-processor</artifactId>
            <version>${org.mapstruct.version}</version>
            <scope>provided</scope>
        </dependency>

当我运行mvn安装时，mapstructs为mapper生成正确的实现。

@Generated(
    value = "org.mapstruct.ap.MappingProcessor",
    date = "2020-04-30T14:09:56+0200",
    comments = "version: 1.3.1.Final, compiler: javac, environment: Java 1.8.0_181 (Oracle Corporation)"
)
@Component
public class Cdr3CXMapperImpl implements Cdr3CXMapper {

    @Override
    public AuditCdr cdr3CXDtoToAuditCdr(Cdr3CXDto cdr3CXDto) {
        if ( cdr3CXDto == null ) {
            return null;
        }

        AuditCdr auditCdr = new AuditCdr();

        auditCdr.setFrom( cdr3CXDto.getFrom() );
        auditCdr.setTo( cdr3CXDto.getTo() );
        if ( cdr3CXDto.getStartDate() != null ) {
            auditCdr.setStartDate( Instant.parse( cdr3CXDto.getStartDate() ) );
        }
        if ( cdr3CXDto.getEndDate() != null ) {
            auditCdr.setEndDate( Instant.parse( cdr3CXDto.getEndDate() ) );
        }

        return auditCdr;
    }
}

没有编译错误，这是确定的。当我像图中那样运行JunitTest时，我出现了一个编译错误，因为这次的实现是错误的。

@Generated(
    value = "org.mapstruct.ap.MappingProcessor",
    date = "2020-04-30T15:09:29+0200",
    comments = "version: 1.3.1.Final, compiler: javac, environment: Java 1.8.0_181 (Oracle Corporation)"
)
@Component
public class Cdr3CXMapperImpl implements Cdr3CXMapper {

    @Override
    public AuditCdr cdr3CXDtoToAuditCdr(Cdr3CXDto cdr3CXDto) {
        if ( cdr3CXDto == null ) {
            return null;
        }

        AuditLogBuilder<?, ?> auditCdr = AuditLog.builder();

        auditCdr.parentId( cdr3CXDto.getContactId() );

        return auditCdr.build();
    }
}

似乎MapStruct使用了父类的构建器，而不是像下面描述的那样使用子类 疑问. 我希望有一种方法可以指导mapstruct生成正确的代码，即使我在IntelliJ IDE中运行一个测试。

Answer 1

Maven和IntelliJ的编译执行应该没有区别。如果有区别，可能意味着Lombok的一些问题。@SuperBuilder.

我将尝试添加 printProcessorInfo 和 printRounds 编译器参数，这样你就可以看到发生了什么。