Question

我有一个Spring Boot App，其中Hibernate作为JPA提供程序和模型映射器依赖项。场景很简单，我有以下控制器：

@RequestMapping(value = "/contracts", method = RequestMethod.PUT, headers = "Accept=application/json")
    @ResponseBody
    @Transactional
    public ResponseEntity<?> updateContract(@DTO(ContractUpdateDto.class) Contract contract,
            UriComponentsBuilder uriComponentsBuilder, final HttpServletRequest request) {
        if(contract!=null) {
            contract.getWork().setState(contract.getState()); //Problematic code that causes the exception
            contractService.updateContract(contract);
            return new ResponseEntity<>(HttpStatus.OK);
        }
        else {
            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
        }

    }

我拥有的映射如下：

工作

@Entity
@Table(name="work")
@Getter
@Setter
@JsonIdentityInfo(
          generator = ObjectIdGenerators.PropertyGenerator.class, 
          property = "id")
public class Work implements Serializable{

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy= GenerationType.AUTO, generator="native")
    @GenericGenerator(name = "native", strategy = "native")
    @Column(name="id_work")
    private int id;

    Some preoperties.....


    @OneToOne(mappedBy = "work", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.LAZY)
    private Contract contract;

}

合同

@Entity
@Table(name="contract")
@Getter
@Setter
public class Contract {

    @Id
    @GeneratedValue(strategy= GenerationType.AUTO, generator="native")
    @GenericGenerator(name = "native", strategy = "native")
    @Column(name="id_contract")
    private int id;

    Some properties.....

    @OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)
    @JoinColumn(name = "fk_contract$milestone", nullable=false)
    private Set<Milestone> milestones;

    @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
    @JoinColumn(name="fk_work$contract")
    private Work work;
}

里程碑

@Entity
@Table(name="milestone")
@Getter
@Setter
public class Milestone {

    @Id
    @GeneratedValue(strategy= GenerationType.AUTO, generator="native")
    @GenericGenerator(name = "native", strategy = "native")
    @Column(name="id_milestone")
    private int id;

    Some properties...

    @OneToOne(cascade = CascadeType.MERGE,fetch = FetchType.EAGER)
    @JoinColumn(name="fk_item$milestone")
    private Item item;

}

项目

@Entity
@Table(name="item")
@Getter
@Setter
public class Item {

    @Id
    @GeneratedValue(strategy= GenerationType.AUTO, generator="native")
    @GenericGenerator(name = "native", strategy = "native")
    @Column(name="id_item")
    private int id;

    Some properties...
}

DTO：

@Getter
public class ContractUpdateDto {

    @Id
    private int id;

    private String clarifications;

    private State state;

    private double subtotal;

    private double administrationFee;

    private Double totalValue;

    private Set<MilestoneUpdateDto> milestones;

}

@Getter
public class MilestoneUpdateDto {

    @Id
    private int id;

    private State state;

    private ItemUpdateDto item;
}

@Getter
public class ItemUpdateDto {

    @Id
    private int id;

    private String name;

    private double value;

    private double durationValue;

    private String durationTime;

    private double warrantyValue;

    private String warrantyTime;

    private String workDescription;

    private String warrantyDescription;

    private String imageContract;

    private String commentContract;
}

当我发送一个包含带有里程碑列表的合同的JSON对象时，就会出现问题，其中每个里程碑都有一个Item对象。像这样：

{"id":16,
"contractNumber":"TEIXSK",
"creationDate":1534772800000,
"state":"CONTRACT_MODIFIED_BY_PROVIDER",
"subtotal":211221,
"administrationFee":10561,
"totalValue":221782,
"milestones":[{"id":15,"state":"CREATED",
"item":{
"id":8,
"name":"Nueva Prueba",
"value":211221,
"durationValue":2,
"durationTime":"Mes(es)",
"warrantyValue":2,
"warrantyTime":"Año(s)",
"workDescription":"sads",
"warrantyDescription":"sdsad",
"imageContract":"data:image/jpeg;base64",
"commentContract":"añadido"}}],
"clarifications":"añadido"
}

发送上述对象后，出现以下错误：

java.lang.IllegalStateException：相同的多个表示形式实体[com.espiritware.opusclick.model.Item＃8]正在合并。分离：[com.espiritware.opusclick.model.Item@530a9998];分离： [com.espiritware.opusclick.model.Item@78eae981]在 org.hibernate.event.internal.EntityCopyNotAllowedObserver.entityCopyDetected（EntityCopyNotAllowedObserver.java:37）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.event.internal.MergeContext.put（MergeContext.java:256）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.event.internal.DefaultMergeEventListener.entityIsDetached（DefaultMergeEventListener.java:304）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.event.internal.DefaultMergeEventListener.onMerge（DefaultMergeEventListener.java:170）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.internal.SessionImpl.fireMerge（SessionImpl.java:850）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.internal.SessionImpl.merge（SessionImpl.java:832）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.engine.spi.CascadingActions $ 6.cascade（CascadingActions.java:260）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.engine.internal.Cascade.cascadeToOne（Cascade.java:398）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.engine.internal.Cascade.cascadeAssociation（Cascade.java:323）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.engine.internal.Cascade.cascadeProperty（Cascade.java:162）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.engine.internal.Cascade.cascadeCollectionElements（Cascade.java:431）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.engine.internal.Cascade.cascadeCollection（Cascade.java:363）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.engine.internal.Cascade.cascadeAssociation（Cascade.java:326）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.engine.internal.Cascade.cascadeProperty（Cascade.java:162）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.engine.internal.Cascade.cascade（Cascade.java:111）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final]在 org.hibernate.event.internal.DefaultMergeEventListener.cascadeOnMerge（DefaultMergeEventListener.java:468）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final] at

我的问题是为什么会发生这种情况，在这种情况下此异常指的是..因为如果我在控制器中注释了这一行：

contract.getWork().setState(contract.getState());

问题消失了，一切正常。...我的问题是，为什么在评论时会出现这种现象非常感谢您的宝贵时间！

同一实体的多个表示形式Hibernate 5

0 个答案: