原因：org.hibernate.AnnotationException：mappedBy引用了未知的目标实体属性:JPA+SpringBoot

Question

模型类

@Entity
@Table(name="RequisitionRequest")
public class Requisition {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
    private String requestedPerson;
    private String contactDetails;
    private String appliedDate;
    private String branch;
    private String department;

    private String status;
     @OneToMany(cascade = CascadeType.ALL,fetch = FetchType.EAGER,mappedBy = "RequisitionRequest")
    private List<Nationality> nationality;
//getters and setters
}

阶级国籍

@Entity
@Table(name="nationality")
public class Nationality {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    private String nationality;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "nationality_id", nullable = false)
    private Requisition requisition;
//getters and setters
}

存储库类

@Repository
public interface NationalityRepository extends JpaRepository<Nationality,Long>{

}

@Repository
public interface RequisitionRepository extends JpaRepository<Requisition,Long> {

}

服务类别

@Service
public class RequisitionServiceImpl implements RequisitionService {
    @Autowired
    RequisitionRepository requisitionRepository;

    @Override
    public void save(Requisition requisition) {
        requisitionRepository.save(requisition);

    }
}

控制器类

@RestController
public class RequisitionController {
    @Autowired
    RequisitionService requisitionService;

    @Autowired
    RequisitionRepository requisitionRepository;
@PostMapping("/requisition/")
    @CacheEvict(value = "requisitions", allEntries=true)
    public ResponseEntity<Requisition> addRequisition(@RequestBody Requisition requisition) {
        System.out.print(requisition);

        Requisition requisitionR = new Requisition();
        Requisition response = new Requisition();




        requisitionR.setBranch(requisition.getBranch());
        requisitionR.setDepartment(requisition.getDepartment());
        requisitionR.setExpectedDateofJoin(requisition.getExpectedDateofJoin());

        //requisitionR.setNationality(requisition.getNationality());


        requisitionRepository.save(requisitionR);


        return new ResponseEntity<Requisition>(response, HttpStatus.OK);
    }

原因：org.hibernate.annotationException：mappedBy引用了未知的目标实体属性：org.hibernate.cfg.annotations.CollectionBinder.BindStartomanySecondPass（CollectionBinder.java:769)~[hibernate-core-5.0.12.final.jar:5.0.12.final]（org.hibernate.cfg.annotations.CollectionBinder$1.secondPass（CollectionBinder.java:719)~[hibernate-core-5.0.12.final.jar:5.0.12.final]（org.hibernate.cfg.annotations.CollectionBinder.719)~[hibernate-core-5.0.12.final.jar:5.0.12.final]。hibernate.cfg.CollectionSecondPass.DoSecondPass(CollectionSecondPass.java:54)~[hibernate-core-5.0.12.final.jar:5.0.12.final]在org.hibernate.boot.internal.InflightMetadatacollectorimpl.java:1655)~[hibernate-core-5.0.12.final.jar:5.0.12.final]在org.hibernate.boot.internal.InflightMetadatacollectorimpl.java:1623)~[hibernate-core-5.0.12.final.final]在.jar:5.0.12.final]在org.hibernate.boot.model上.process.spi.MetadatabuildingProcess.Complete(MetadatabuildingProcess.java:278)~[hibernate-core-5.0.12.final.jar:5.0.12.final.final]在org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:847)~[hibernate-EntityManager-5.0.12.final.jar:5.0.12.final]在.0.12.final.jar:5.0.12.final]

我尝试了这个网站上已经提到的解决方案，但它对我不起作用。有谁能帮我解决这个问题吗

Answer 1

您应该在MappedBy参数中引用mapped entity中字段的名称。

像那样

mappedBy = "requisition"