登录
当前位置： 首页 > 知识库问答 >
问题：

不可能用Mapstruct映射嵌套列表--在测试期间，它返回List=null

黄朗
2023-03-14

我还在学习，所以不要严格评判）

两个问题：1）映射中的错误--没有将列表对象设置为镜像对象（在一个方向上列表是空的，在另一个方向上列表长度超出界限0）2）对象层次结构映射的优化

@MappedSuperclass
@Data
@NoArgsConstructor
public abstract class BusinessEntity {
    @Id
    @GeneratedValue(generator = "UUID")
    @GenericGenerator(name = "UUID", strategy = "org.hibernate.id.UUIDGenerator")
    @Column(name = "id", updatable = false, nullable = false)
    private UUID id;
    @Column(updatable = false)
    @CreationTimestamp
    private LocalDateTime createdOn;
    @UpdateTimestamp
    private LocalDateTime modifiedOn;
    private LocalDateTime deletedOn;
    @NotNull
    private boolean SystemProtectedStatus = false;
    @NotNull
    private boolean SuspendedStatus = false;
    @NotNull
    private boolean blockedStatus = false;
    @NotNull
    private boolean deletedStatus = false;
    private LocalDateTime activeFrom;
    private LocalDateTime activeUntil;
}

@Entity
@Data
@NoArgsConstructor
@AllArgsConstructor
public class SystemRights extends BusinessEntity {

    @NotNull
    private String name;
    private String description;

    public SystemRights(@NotNull String name) {
        super();
        this.name = name;
    }
}

@EqualsAndHashCode(callSuper = true)
@Entity
@Data
@NoArgsConstructor
public class UserRole extends BusinessEntity{

    @NotNull
    private String name;
    private String description;

    @ManyToMany
    @JoinTable(
            name = "rights_in_roles"
            , joinColumns = @JoinColumn(name = "right_id")
            , inverseJoinColumns = @JoinColumn (name = "role_id")
    )
    public List<SystemRights> systemRights;



    public UserRole(@NotNull String name) {
        this.name = name;
    }


    public List<SystemRights> getSystemRights() {
        if (systemRights == null)
            systemRights = new ArrayList<>();
        return systemRights;
    }

    public void addSystemRights(SystemRights newSystemRights) {
        if (newSystemRights == null)
            return;
        if (this.systemRights == null)
            this.systemRights = new ArrayList<>();
        this.systemRights.add(newSystemRights);
    }

    public void removeSystemRights(SystemRights oldSystemRights) {
        if (oldSystemRights == null)
            return;
        if (this.systemRights != null)
            this.systemRights.remove(oldSystemRights);
    }

    public void removeAllSystemRights() {
        if (systemRights != null)
            systemRights.clear();
    }
}

我想将其映射到DTO中，如下所示：（实际上是一对一）

@Data
public abstract class Dto {

    private String id;
    private String activeFrom;
    private String activeUntil;

    private boolean SystemProtectedStatus;
    private boolean SuspendedStatus;
    private boolean blockedStatus;
    private boolean deletedStatus;

    private String createdOn;
    //    private User createdBy;
    private String modifiedOn;
    //    private User modifiedBy;
    private String deletedOn;
//    private User deletedBy;
}

@Data
public class SystemRightsDto extends Dto{

    @NotNull
    private String name;
    private String description;
}

@Data
public class UserRoleDto extends Dto {

    @NotNull
    private String name;
    private String description;

    @NotNull
    public List<SystemRightsDto> systemRightsDto;
}

为了做到这一点，我把这些映射器堆在下面。-这是第一个问题：-在MapStruct中，如何正确地从根实体BusinessEntity继承映射，它是系统中所有记帐对象的祖先，而不像我在培训中遇到的那样，复制粘贴到每个子对象？

@Mapper
public interface UserRoleMapper {

    @Mapping(target = "id",
            expression = "java(getStringFromId(entity.getId()))")
    @Mapping(target = "activeFrom",
            expression = "java(getStringfromLDT(entity.getActiveFrom()))")
    @Mapping(target = "activeUntil",
            expression = "java(getStringfromLDT(entity.getActiveUntil()))")
    @Mapping(target = "createdOn",
            expression = "java(getStringfromLDT(entity.getCreatedOn()))")
    @Mapping(target = "modifiedOn",
            expression = "java(getStringfromLDT(entity.getModifiedOn()))")
    @Mapping(target = "deletedOn",
            expression = "java(getStringfromLDT(entity.getDeletedOn()))")
    UserRoleDto getDtoFromEntity(UserRole entity);



    @Mapping(target = "id",
            expression = "java(getIdFromString(dto.getId()))")
    @Mapping(target = "activeFrom",
            expression = "java(getLDTfromString(dto.getActiveFrom()))")
    @Mapping(target = "activeUntil",
            expression = "java(getLDTfromString(dto.getActiveUntil()))")
    @Mapping(target = "createdOn",
            expression = "java(getLDTfromString(dto.getCreatedOn()))")
    @Mapping(target = "modifiedOn",
            expression = "java(getLDTfromString(dto.getModifiedOn()))")
    @Mapping(target = "deletedOn",
            expression = "java(getLDTfromString(dto.getDeletedOn()))")

    UserRole getEntityFromDto(UserRoleDto dto);



    List<SystemRights> SystemRightsDtoToEnt (List<SystemRightsDto> dto);
    List<SystemRightsDto> SystemRightsEntToDto (List<SystemRights> entity);


    default LocalDateTime getLDTfromString(String string) {
        DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME;
        if (!isNull(string)) {
            return LocalDateTime.parse(string, formatter);
        } else {
            return null;
        }
    }
    default String getStringfromLDT(LocalDateTime ldt) {
        DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME;
        if (!isNull(ldt)) {
            return ldt.toString();
        } else {
            return null;
        }
    }
    default String getStringFromId(UUID id) {
        if (!isNull(id)) {
            return id.toString();
        } else {
            return null;
        }
    }
    default UUID getIdFromString(String id) {
        if (!isNull(id)) {
            return UUID.fromString(id);
        } else {
            return null;
        }
    }
}


@Mapper
public interface SystemRightsMapper {

    @Mapping(target = "id",
            expression = "java(getStringFromId(entity.getId()))")
    @Mapping(target = "activeFrom",
            expression = "java(getStringfromLDT(entity.getActiveFrom()))")
    @Mapping(target = "activeUntil",
            expression = "java(getStringfromLDT(entity.getActiveUntil()))")
    @Mapping(target = "createdOn",
            expression = "java(getStringfromLDT(entity.getCreatedOn()))")
    @Mapping(target = "modifiedOn",
            expression = "java(getStringfromLDT(entity.getModifiedOn()))")
    @Mapping(target = "deletedOn",
            expression = "java(getStringfromLDT(entity.getDeletedOn()))")
    SystemRightsDto getDtoFromEntity(SystemRights entity);


    @Mapping(target = "id",
            expression = "java(getIdFromString(dto.getId()))")
    @Mapping(target = "activeFrom",
            expression = "java(getLDTfromString(dto.getActiveFrom()))")
    @Mapping(target = "activeUntil",
            expression = "java(getLDTfromString(dto.getActiveUntil()))")
    @Mapping(target = "createdOn",
            expression = "java(getLDTfromString(dto.getCreatedOn()))")
    @Mapping(target = "modifiedOn",
            expression = "java(getLDTfromString(dto.getModifiedOn()))")
    @Mapping(target = "deletedOn",
            expression = "java(getLDTfromString(dto.getDeletedOn()))")
    SystemRights getEntityFromDto(SystemRightsDto dto);

    List<SystemRights> SystemRightsDtoToEnt (List<SystemRightsDto> dto);
    List<SystemRightsDto> SystemRightsEntToDto (List<SystemRights> entity);

    default LocalDateTime getLDTfromString(String string) {
        DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME;
        if (!isNull(string)) {
            return LocalDateTime.parse(string, formatter);
        } else {
            return null;
        }
    }
    default String getStringfromLDT(LocalDateTime ldt) {
        DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME;
        if (!isNull(ldt)) {
            return ldt.toString();
        } else {
            return null;
        }
    }
    default String getStringFromId(UUID id) {
        if (!isNull(id)) {
            return id.toString();
        } else {
            return null;
        }
    }
    default UUID getIdFromString(String id) {
        if (!isNull(id)) {
            return UUID.fromString(id);
        } else {
            return null;
        }
    }
}

SystemRights传输测试以两种方式工作，但UserRole测试失败。测试本身是这样的：

public class UserRoleMapperTest {
    private UserRoleMapper userRoleMapper = Mappers.getMapper(UserRoleMapper.class);

    @Test
    public void testEntityToDto(){

        String  testDateStr = "2021-04-05T12:53:16.173706900";
        LocalDateTime testDateLDT = LocalDateTime.parse(testDateStr);
        UUID uuidTest = UUID.fromString("c095ad9f-37d4-479f-b88d-17df04f2437b");

        UserRole e = new UserRole();
        e.setName("Admin");
        e.setDescription("Super");
        e.setId(uuidTest);
        e.setActiveFrom(testDateLDT);
        e.setActiveUntil(testDateLDT);
        e.setSystemProtectedStatus(true);
        e.setBlockedStatus(false);
        e.setSuspendedStatus(true);
        e.setDeletedStatus(false);
        e.setCreatedOn(testDateLDT);
        e.setDeletedOn(testDateLDT);
        e.setModifiedOn(testDateLDT);

        List<SystemRights> eList = new ArrayList<>();
        e.setSystemRights(eList);

        SystemRights sr1= new SystemRights("Create");
        SystemRights sr2= new SystemRights("Read");
        SystemRights sr3= new SystemRights("Delete");
        eList.add(sr1);
        eList.add(sr2);
        eList.add(sr3);

        System.out.println("Testing testEntityToDto:  Entity have");
        System.out.println(e);

        UserRoleDto d = userRoleMapper.getDtoFromEntity(e);

        assertEquals(d.getName(),e.getName());
        assertEquals(d.getDescription(),e.getDescription());
        assertEquals(d.getId(),"c095ad9f-37d4-479f-b88d-17df04f2437b");
        assertEquals(d.getActiveFrom(),"2021-04-05T12:53:16.173706900");
        assertEquals(d.getActiveUntil(), "2021-04-05T12:53:16.173706900");
        assertEquals(d.isSystemProtectedStatus(),e.isSystemProtectedStatus());
        assertEquals(d.isDeletedStatus(),e.isDeletedStatus());
        assertEquals(d.isBlockedStatus(),e.isBlockedStatus());
        assertEquals(d.isSuspendedStatus(),e.isSuspendedStatus());
        assertEquals(d.getCreatedOn(),"2021-04-05T12:53:16.173706900");
        assertEquals(d.getModifiedOn(),"2021-04-05T12:53:16.173706900");
        assertEquals(d.getDeletedOn(),"2021-04-05T12:53:16.173706900");

        assertEquals(d.getSystemRightsDto().get(0).toString(),e.getSystemRights().get(0).toString());
        assertEquals(d.getSystemRightsDto().get(1).toString(),e.getSystemRights().get(1).toString());
        assertEquals(d.getSystemRightsDto().get(2).toString(),e.getSystemRights().get(2).toString());

        assertEquals(d.getSystemRightsDto().toString(),e.getSystemRights().toString());

        System.out.println("Testing testEntityToDto:  Dto have");
        System.out.println(d);
    }

    @Test
    public void testDtoToEntity(){

        String  testDateStr = "2021-04-05T12:53:16.173706900";
        LocalDateTime testDateLDT = LocalDateTime.parse(testDateStr);
        UUID uuidTest = UUID.fromString("c095ad9f-37d4-479f-b88d-17df04f2437b");

        UserRoleDto  d = new UserRoleDto();
        d.setName("Create");
        d.setDescription("Desc");
        d.setId("c095ad9f-37d4-479f-b88d-17df04f2437b");
        d.setActiveFrom("2021-04-05T12:53:16.173706900");
        d.setActiveUntil("2021-04-05T12:53:16.173706900");
        d.setSystemProtectedStatus(true);
        d.setBlockedStatus(false);
        d.setSuspendedStatus(true);
        d.setDeletedStatus(false);
        d.setCreatedOn("2021-04-05T12:53:16.173706900");
        d.setDeletedOn("2021-04-05T12:53:16.173706900");
        d.setModifiedOn("2021-04-05T12:53:16.173706900");

        List<SystemRightsDto> eListDto = new ArrayList<>();
        d.setSystemRightsDto(eListDto);

        SystemRightsDto sr1= new SystemRightsDto();
        sr1.setName("Create");
        SystemRightsDto sr2= new SystemRightsDto();
        sr2.setName("Read");
        SystemRightsDto sr3= new SystemRightsDto();
        sr3.setName("Delete");
        eListDto.add(sr1);
        eListDto.add(sr2);
        eListDto.add(sr3);

        System.out.println("Testing testDtoToEntity:  Dto have");
        System.out.println(d);

        UserRole e = userRoleMapper.getEntityFromDto(d);

        assertEquals(e.getName(),d.getName());
        assertEquals(e.getDescription(),d.getDescription());
        assertEquals(e.getId(),uuidTest);
        assertEquals(e.getActiveFrom(),testDateLDT);
        assertEquals(e.getActiveUntil(),testDateLDT);
        assertEquals(e.isSystemProtectedStatus(),d.isSystemProtectedStatus());
        assertEquals(e.isDeletedStatus(),d.isDeletedStatus());
        assertEquals(e.isBlockedStatus(),d.isBlockedStatus());
        assertEquals(e.isSuspendedStatus(),d.isSuspendedStatus());
        assertEquals(e.getCreatedOn(),testDateLDT);
        assertEquals(e.getModifiedOn(),testDateLDT);
        assertEquals(e.getDeletedOn(),testDateLDT);

        assertEquals(e.getSystemRights().get(0).toString(),d.getSystemRightsDto().get(0).toString());
        assertEquals(e.getSystemRights().get(1).toString(),d.getSystemRightsDto().get(1).toString());
        assertEquals(e.getSystemRights().get(2).toString(),d.getSystemRightsDto().get(2).toString());

        assertEquals(e.getSystemRights().toString(),d.getSystemRightsDto().toString());

        System.out.println("Testing testDtoToEntity:  Entity have");
        System.out.println(e);
    }
}

当我开始“TestEntityTodTo”测试时，我会发现：

测试TestEntityTodto：实体有UserRole(name=admin,description=super,SystemRights=[SystemRights(name=create,description=null)),SystemRights(name=delete,description=null)))

nullPointerException：无法调用“java.util.list.get（int）”，因为“com.example.cparty.dto.userroledto.getSystemRightSDTO（）”的返回值为null

在com.example.cparty.userrolemappertest.TestEntityTodto(Userrolemappertest.java:77)

当我开始“TestDtotoEntity”测试时，我会发现：

测试TestDtoToEntity：Dto have UserRoleDto（名称=创建，描述=Desc，SystemRightsDto=[SystemRightsDto(Name=Create,Description=NULL)，SystemRightsDto(Name=Read,Description=NULL))，SystemRightsDto(Name=Delete，Description=NULL))

java.lang.IndexOutOfBoundsException：索引0超出长度0的范围

at java.base/java.util.Objects.checkIndex(Objects.java:359)
at java.base/java.util.ArrayList.get(ArrayList.java:427)
at com.example.cparty.UserRoleMapperTest.testDtoToEntity(UserRoleMapperTest.java:149)

MapStrakt本身生成了以下代码：（在其中，我没有看到它如何为目标对象设置列表）

@Generated(
    value = "org.mapstruct.ap.MappingProcessor",
    date = "2021-04-06T11:03:58+0300",
    comments = "version: 1.4.2.Final, compiler: javac, environment: Java 11.0.6 (JetBrains s.r.o)"
)
public class UserRoleMapperImpl implements UserRoleMapper {

    @Override
    public UserRoleDto getDtoFromEntity(UserRole entity) {
        if ( entity == null ) {
            return null;
        }

        UserRoleDto userRoleDto = new UserRoleDto();

        userRoleDto.setSystemProtectedStatus( entity.isSystemProtectedStatus() );
        userRoleDto.setSuspendedStatus( entity.isSuspendedStatus() );
        userRoleDto.setBlockedStatus( entity.isBlockedStatus() );
        userRoleDto.setDeletedStatus( entity.isDeletedStatus() );
        userRoleDto.setName( entity.getName() );
        userRoleDto.setDescription( entity.getDescription() );

        userRoleDto.setId( getStringFromId(entity.getId()) );
        userRoleDto.setActiveFrom( getStringfromLDT(entity.getActiveFrom()) );
        userRoleDto.setActiveUntil( getStringfromLDT(entity.getActiveUntil()) );
        userRoleDto.setCreatedOn( getStringfromLDT(entity.getCreatedOn()) );
        userRoleDto.setModifiedOn( getStringfromLDT(entity.getModifiedOn()) );
        userRoleDto.setDeletedOn( getStringfromLDT(entity.getDeletedOn()) );

        return userRoleDto;
    }

    @Override
    public UserRole getEntityFromDto(UserRoleDto dto) {
        if ( dto == null ) {
            return null;
        }

        UserRole userRole = new UserRole();

        userRole.setSystemProtectedStatus( dto.isSystemProtectedStatus() );
        userRole.setSuspendedStatus( dto.isSuspendedStatus() );
        userRole.setBlockedStatus( dto.isBlockedStatus() );
        userRole.setDeletedStatus( dto.isDeletedStatus() );
        userRole.setName( dto.getName() );
        userRole.setDescription( dto.getDescription() );

        userRole.setId( getIdFromString(dto.getId()) );
        userRole.setActiveFrom( getLDTfromString(dto.getActiveFrom()) );
        userRole.setActiveUntil( getLDTfromString(dto.getActiveUntil()) );
        userRole.setCreatedOn( getLDTfromString(dto.getCreatedOn()) );
        userRole.setModifiedOn( getLDTfromString(dto.getModifiedOn()) );
        userRole.setDeletedOn( getLDTfromString(dto.getDeletedOn()) );

        return userRole;
    }

    @Override
    public List<SystemRights> SystemRightsDtoToEnt(List<SystemRightsDto> dto) {
        if ( dto == null ) {
            return null;
        }

        List<SystemRights> list = new ArrayList<SystemRights>( dto.size() );
        for ( SystemRightsDto systemRightsDto : dto ) {
            list.add( systemRightsDtoToSystemRights( systemRightsDto ) );
        }

        return list;
    }

    @Override
    public List<SystemRightsDto> SystemRightsEntToDto(List<SystemRights> entity) {
        if ( entity == null ) {
            return null;
        }

        List<SystemRightsDto> list = new ArrayList<SystemRightsDto>( entity.size() );
        for ( SystemRights systemRights : entity ) {
            list.add( systemRightsToSystemRightsDto( systemRights ) );
        }

        return list;
    }

    protected SystemRights systemRightsDtoToSystemRights(SystemRightsDto systemRightsDto) {
        if ( systemRightsDto == null ) {
            return null;
        }

        SystemRights systemRights = new SystemRights();

        systemRights.setId( getIdFromString( systemRightsDto.getId() ) );
        systemRights.setCreatedOn( getLDTfromString( systemRightsDto.getCreatedOn() ) );
        systemRights.setModifiedOn( getLDTfromString( systemRightsDto.getModifiedOn() ) );
        systemRights.setDeletedOn( getLDTfromString( systemRightsDto.getDeletedOn() ) );
        systemRights.setSystemProtectedStatus( systemRightsDto.isSystemProtectedStatus() );
        systemRights.setSuspendedStatus( systemRightsDto.isSuspendedStatus() );
        systemRights.setBlockedStatus( systemRightsDto.isBlockedStatus() );
        systemRights.setDeletedStatus( systemRightsDto.isDeletedStatus() );
        systemRights.setActiveFrom( getLDTfromString( systemRightsDto.getActiveFrom() ) );
        systemRights.setActiveUntil( getLDTfromString( systemRightsDto.getActiveUntil() ) );
        systemRights.setName( systemRightsDto.getName() );
        systemRights.setDescription( systemRightsDto.getDescription() );

        return systemRights;
    }

    protected SystemRightsDto systemRightsToSystemRightsDto(SystemRights systemRights) {
        if ( systemRights == null ) {
            return null;
        }

        SystemRightsDto systemRightsDto = new SystemRightsDto();

        systemRightsDto.setId( getStringFromId( systemRights.getId() ) );
        systemRightsDto.setActiveFrom( getStringfromLDT( systemRights.getActiveFrom() ) );
        systemRightsDto.setActiveUntil( getStringfromLDT( systemRights.getActiveUntil() ) );
        systemRightsDto.setSystemProtectedStatus( systemRights.isSystemProtectedStatus() );
        systemRightsDto.setSuspendedStatus( systemRights.isSuspendedStatus() );
        systemRightsDto.setBlockedStatus( systemRights.isBlockedStatus() );
        systemRightsDto.setDeletedStatus( systemRights.isDeletedStatus() );
        systemRightsDto.setCreatedOn( getStringfromLDT( systemRights.getCreatedOn() ) );
        systemRightsDto.setModifiedOn( getStringfromLDT( systemRights.getModifiedOn() ) );
        systemRightsDto.setDeletedOn( getStringfromLDT( systemRights.getDeletedOn() ) );
        systemRightsDto.setName( systemRights.getName() );
        systemRightsDto.setDescription( systemRights.getDescription() );

        return systemRightsDto;
    }
}

好吧，也许问题出在我的环境中（整个pom.xml不适合）：

<org.mapstruct.version>1.4.2.Final</org.mapstruct.version>
<artifactId>spring-boot-starter-actuator</artifactId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<artifactId>spring-boot-starter-data-rest</artifactId>
 <artifactId>spring-boot-starter-validation</artifactId>
<artifactId>spring-boot-starter-web</artifactId>
 <artifactId>spring-boot-devtools</artifactId>
   <artifactId>postgresql</artifactId>
<artifactId>spring-boot-configuration-processor</artifactId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
<artifactId>lombok-mapstruct-binding</artifactId>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct</artifactId>
            <version>${org.mapstruct.version}</version>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
<artifactId>spring-boot-starter-test</artifactId>


                    <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>

共有1个答案

乐正浩宕
2023-03-14

当使用mapping#expression，MapStruct将原样复制它，而不进行任何检查。

这个问题中有许多表达式。我建议要么手工进行映射，要么让MapStruct来完成。

实际上，您可以删除所有@mapping，并且一切都可以正常工作。

 类似资料：
  • 使用MapStruct的嵌套列表映射

    我如何在下面的场景中使用Mapstruct进行bean映射。 现在我想把sourceId映射到targetId，courseName映射到subjectName，studentName映射到memberName(list到list)。

  • 用MapStruct映射嵌套的原始列表

    我正在尝试映射我的遗留API对象（我无法更改它），该对象具有嵌套的原始类型属性。列表的元素与DTO列表的元素不兼容，应显式映射为嵌套。不幸的是，MapStruct似乎认为原始与所有类型化列表兼容，并忽略了我试图指定的任何映射，而生成的代码不能正常工作，随后在序列化程序的某个地方产生错误。 我的API对象具有嵌套的原始类型列表： 我的DTO对象具有DTO值类型元素的泛型类型列表： ...但MapSt

  • MapStruct嵌套映射

    我尝试使用MapStruct编写映射器类，如下所示： 目前它显示了“未知属性”“customer.customerid”和“usertypes.usertype.userid”等错误。有人能帮我用MapStruct映射所有这些元素吗？ 问题2：我们如何绘制跟踪图？1）customerId usertypes->user->userid 2)pdtPrice offers->OffersType->

  • 使用Mapstruct和MyBatis映射嵌套列表对象

    我不确定如何将嵌套的结果集映射到域实体中。 以下是我想做的事情的大概想法: 2张桌子 域实体（包含嵌套列表） LoanEntity.java Book.java 持久实体 Loans.java Dao.xml（不知道如何映射它，尝试使用一个） 注意：此查询将复制找到的#本书的记录。 LoanMapper.java 下面的错误是我得到的: 错误：结果类型中的未知属性“books.bookName”c

  • 用mapstruct映射嵌套对象

    我创建映射如下所示。如何将平面dto对象属性（街道、城市等）映射到域对象中的嵌套地址。当我试着去做的时候,我发现了一个错误： [错误]诊断：返回类型中的属性“Address.PostalCode”未知。@Mapping（来源=“City”，目标=“Address.City”）， 还有类...

  • 用MapStruct映射嵌套字段

    假设我有这些实体： null

相关问答

用mapstruct映射嵌套对象用MapStruct映射嵌套字段映射嵌套元素-MapstructMapStruct：模仿嵌套映射器@在mapstruct上映射列表

相关文章

嵌套类型的动态映射嵌套列表pythonMarkdown 嵌套列表MySQL日期时间不返回时间为什么json.Unmarshal返回映射而不是预期的结构？

相关阅读

Junit4 套件测试回归测试功能测试Python list列表查找元素Python list列表修改元素

相关工具

UITable嵌套UITable正则表达式测试器仿天猫App可打开列表纵向Table里嵌套横向TableWizTools.org正则表达式测试工具

相关文档

蜻蜓映射帮助文档测试手册Android 测试教程OWASP 测试指南 v4.0Mocha 测试框架中文文档
快捷导航： 新手教程 算法原理 架构设计 Java进阶 数据库进阶 大厂专栏 面试经验 编程笔记 编程问答 所有专题 文档资料 工具软件 电子书籍 小牛导航
在线工具： 房贷计算器 个税计算器 Linux命令查询 Json格式化 正则表达式 颜色转换 AES加解密 SHA1加密 MD5加密 毒鸡汤 字数统计 随机密码生成 进制转换 Base64编解码 励志句子
Copyright © 2019-2024 小牛知识库@xnip.cn. All Rights Reserved.