【发布时间】：2019-10-17 11:05:44
【问题描述】：
我遇到了 mapstruct 映射器的问题。运行 mvn clean install（或 mvn clean compile）时，出现以下错误：
[ERROR] /mapper/EntityMapper.java:[28,7] Can't map property "java.util.List<com.socomec.tseselector.model.Source> architecture.sources
" to "java.lang.Integer architecture.sources". Consider to declare/implement a mapping method: "java.lang.Integer map(java.util.List<com.socomec.tseselector.model.Source> value)".
[ERROR] /mapper/command/TSEProjectCommandMapper.java:[21,16] Can't map property "java.lang.Integer architecture.loads" to "java.util.List<com.socomec.tseselector.model.Load> architecture.loads". Consider to declare/implement a mapping method: "java.util.List<com.socomec.tseselector.model.Load> map(java.lang.Integer value)".
问题是我不知道 mapstruct 从哪里得到这个“java.lang.Integer architecture.loads”。 我不明白这个整数是从哪里来的，正如你在我的代码中看到的那样，没有整数。到目前为止，我在使用类似的映射器时从未遇到过这个错误。
这是我的实体架构：
public class Architecture {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
private String imagePath;
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(name="tse_architectures_loads",
joinColumns = {@JoinColumn(table = "tse_architecture", name = "architecture_id")},
inverseJoinColumns = {@JoinColumn(table = "tse_load", name = "load_id")}
)
private List<Load> loads;
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(name="tse_architectures_sources",
joinColumns = {@JoinColumn(table = "tse_architecture", name = "architecture_id")},
inverseJoinColumns = {@JoinColumn(table = "tse_source", name = "source_id")}
)
private List<Source> sources;
private String techno;
public Architecture() {
this.loads = new ArrayList<>();
this.sources = new ArrayList<>();
}
DTO
public class ArchitectureDto {
private Long id;
private String name;
private String imagePath;
private List<LoadDto> loadDtos;
private List<SourceDto> sourceDtos;
private String techno;
public ArchitectureDto() {
this.loadDtos = new ArrayList<>();
this.sourceDtos = new ArrayList<>();
}
}
我的映射器：
@Mapper(componentModel = "spring")
public interface ArchitectureMapper extends EntityMapper<ArchitectureDto, Architecture> {
@Mapping(source = "loads", target = "loadDtos")
@Mapping(source = "sources", target = "sourceDtos")
ArchitectureDto toDto(Architecture architecture);
}
实体映射器：
public interface EntityMapper<D, E> {
/**
* Map a DTO to an Entity
*
* @param dto the dto to map
* @return an Entity
*/
E toEntity(D dto);
/**
* Map an Entity to a DTO
*
* @param entity to map to a DTO
* @return a DTO
*/
D toDto(E entity);
/**
* Map a List of DTOs to a List of Entities
*
* @param dtoList the list to map
* @return a list of Entities
*/
List<E> toEntity(List<D> dtoList);
/**
* Map a list of Entities to a list of DTOs
*
* @param entityList the list to map
* @return a list of DTOs
*/
List<D> toDto(List<E> entityList);
}
在这里查看有关mapstruct的文档和其他问题，到目前为止我还没有找到解决方案。
我正在添加我的负载和源类 加载：
public class Load {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
private String type;
private String unity;
private Long sourcePriority1;
private Long SourcePriority2;
private Long SourcePriority3;
private Long kvaValue;
private Long kwValue;
private Long pfValue;
private Long aValue;
private Long iccValue;
@JsonIgnore
@ManyToMany(mappedBy = "loads")
private List<TSEProject> tseProjects;
@JsonIgnore
@ManyToMany(mappedBy = "loadList")
private List<Architecture> architectures;
public Load() {
this.architectures = new ArrayList<>();
this.tseProjects = new ArrayList<>();
}
来源：
public class Source {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
private String type;
private String unity;
private Long quantity;
private Long kvaValue;
private Long kwValue;
private Long pfValue;
private Long aValue;
@JsonIgnore
@ManyToMany(mappedBy = "sources")
private List<TSEProject> tseProjects;
@JsonIgnore
@ManyToMany(mappedBy = "sourceList")
private List<Architecture> architectures;
public Source() {
this.architectures = new ArrayList<>();
this.tseProjects = new ArrayList<>();
}
}
和 DTO
@Data
public class LoadDto {
private Long id;
private String name;
private String type;
private String unity;
private Long sourcePriority1;
private Long SourcePriority2;
private Long SourcePriority3;
private Long kvaValue;
private Long kwValue;
private Long pfValue;
private Long aValue;
private Long iccValue;
private List<Long> tseProjectsId;
public LoadDto() {
this.tseProjectsId = new ArrayList<>();
}
}
@Data
public class SourceDto {
private Long id;
private String name;
private String type;
private String unity;
private Long quantity;
private Long kvaValue;
private Long kwValue;
private Long pfValue;
private Long aValue;
}
【问题讨论】：
-
您确定您使用的是最新/正确版本的实体和 DTO 类吗？ MapStruct 似乎认为 DTO 中的字段
sources是java.lang.Integer，但这与ArchitectureDto的来源不对应。 DTO 中是否有 getter 和 setter 方法？ （你在上面的代码中遗漏了？） -
我确实忽略了 getter 和 setter。我正在使用 Lombok 通过 @Data 生成 getter 和 setter。
-
据我所知，字段 architecture.loads 从来都不是整数。如果我没有使用最新版本，我将如何解决这个问题？