Question

我有一个如下的Jpa方法。

Set<ApplicationMaterialFile> findAllByProcessInstanceIdAndApplicationMaterialIn(String processInstanceId, Collection<ApplicationMaterial> applicationMaterials);

这是用于调用上述Spring Data JPA方法的代码。调用上述Spring Data JPA方法时，将引发异常。

@Override
    public Set<ApplicationMaterialFile> getAllByProcessInstanceIdApplicationMaterialIds(String processInstanceId, Set<Long> applicationMaterialId) {
        List<ApplicationMaterial> applicationMaterials = applicationMaterialService.getAllByIdIfNotExistsThenThrowException(applicationMaterialId);

        return applicationMaterialFileRepository.findAllByProcessInstanceIdAndApplicationMaterialIn(processInstanceId, applicationMaterials);
    }

这是ApplicationMaterial实体结构。

/**
 * 
 * @see <a href="https://code.aliyun.com/butterfly-effect/backend/wikis/plans"
 * @author himly z1399956473@gamil.com
 */
@Table(name = "application_material_library")
@Entity
@EntityListeners(AuditingEntityListener.class)
@Data
@ToString(exclude = {"university"})
@EqualsAndHashCode(exclude = {"university"})
public class ApplicationMaterial {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(nullable = false)
    private String name;

    private String fileFormat;


    private String description;


    private String templateFileUrl;


    @JsonIgnore
    @ManyToOne
    private University university;


    @CreatedDate
    @Column(nullable = false)
    private Timestamp createdAt;


    @LastModifiedDate
    @Column(nullable = false)
    private Timestamp updatedAt;
}

何时调用Spring Data JPA方法findAllByProcessInstanceIdAndApplicationMaterialIn会引发如下异常

由于：java.lang.IllegalArgumentException：参数值元素 [ApplicationMaterial（id = 1，name = sdfsf，fileFormat = doc， description = dfsdfds，templateFileUrl = fsdfsdf，createdAt = 2018-09-26 16：54：09.297，updatedAt = 2018-09-26 16：54：23.451）]不匹配预期的类型[com.hikedu.backend.model.ApplicationMaterial（n / a）]

有人可以帮我吗？

更新：

表结构：

-- auto-generated definition
create table application_material_library
(
  id                bigint auto_increment
    primary key,
  created_at        datetime(6)  not null,
  description       varchar(255) null,
  file_format       varchar(255) null,
  name              varchar(255) not null,
  template_file_url varchar(255) null,
  updated_at        datetime(6)  not null,
  university_id     bigint       null,
  constraint FK9kuemh1kjhyt8u16sqw6i6t59
  foreign key (university_id) references universities (id)
);

Answer 1

Spring Data似乎找不到您的自定义方法实现。

因此，它将方法解释为派生查询方法，并抱怨参数类型与期望值不匹配。该错误很奇怪，因为它抱怨，尽管类型似乎匹配。但这不是您的问题。问题是找不到自定义方法。

This answer describes how to do a custom implementation depending on which version of Spring Data you are using。

Jpa参数值元素[xxx]与预期的类型[xxx]不匹配

1 个答案: