JPA：如何通过一些级联关系来持久化对象？仍然是Javax.persistence.PersistenceException ...

时间：2012-08-22 19:21:15

标签： java jpa

我做了很多研究，但我找不到真正的问题答案。

我想创建一个有很多关系的对象，并坚持下去。

我的实体是：在引用类型上定义的引用，链接到手册（可能是null）。该参考是为一架或多架飞机定义的，并有一些翻译。

为了方便起见，我为级联和orphelanRemoval添加了一些注释。

这里的代码。

@Table(name = "T_E_REFERENCE_REF", 
       uniqueConstraints = @UniqueConstraint(columnNames = "REF_IDENTIFIER"))
public class Reference implements java.io.Serializable {

    @Id
    @Column(name = "REF_ID", unique = true, nullable = false)
    @TableGenerator(name="referenceSeqStore", 
        table="T_S_APP_SEQ_STORE_AST", 
        pkColumnName="AST_SEQ_NAME",
        valueColumnName = "AST_SEQ_VALUE",
        pkColumnValue = "T_E_REFERENCE_REF.REF_ID", 
        allocationSize=1)
    @GeneratedValue(strategy=GenerationType.TABLE, generator="referenceSeqStore")                   
    private Integer id;

    @Column(name = "REF_IDENTIFIER", unique = true, nullable = false, length = 50)  
    private String identifier;

    @Column(name = "REF_LINK")  
    private String link;

    @Column(name = "REF_OBSERVATIONS", length = 4000)
    private String observations;

    @ManyToOne
    @JoinColumn(name = "REF_RFT_ID", nullable = false)  
    private ReferenceType referenceType;

    @ManyToOne
    @JoinColumn(name = "REF_MAN_ID")    
    private Manual manual;  

    @OneToMany(fetch = FetchType.LAZY, 
               mappedBy = "reference",
               cascade = { CascadeType.ALL }, orphanRemoval = true)
    private Set<Translation> translations = new HashSet<Translation>(0);

    @ManyToMany(fetch = FetchType.LAZY,
                cascade = { CascadeType.ALL })
    @JoinTable(name = "T_J_REF_AIR_RFA", 
               joinColumns = { @JoinColumn(name = "RFA_REF_ID", nullable = false, updatable = false) },
               inverseJoinColumns = { @JoinColumn(name = "RFA_AIR_ID", nullable = false, updatable = false) })
    private Set<Aircraft> aircrafts = new HashSet<Aircraft>(0);

    @Transient 
    private String localeTranslation;

}


@Table(name = "T_R_AIRCRAFT_AIR", 
       uniqueConstraints = @UniqueConstraint(columnNames = "AIR_NAME"))
public class Aircraft implements java.io.Serializable {

    @Id
    @Column(name = "AIR_ID", unique = true, nullable = false)
    @TableGenerator(name="aircraftSeqStore", 
        table="T_S_APP_SEQ_STORE_AST", 
        pkColumnName="AST_SEQ_NAME",
        valueColumnName = "AST_SEQ_VALUE",
        pkColumnValue = "T_R_AIRCRAFT_AIR.AIR_ID", 
        allocationSize=1)
    @GeneratedValue(strategy=GenerationType.TABLE, 
        generator="aircraftSeqStore")       
    private Integer id;

    @Column(name = "AIR_NAME", unique = true, nullable = false, length = 50)
    private String name;

    @ManyToMany(fetch = FetchType.LAZY)
    @JoinTable(name = "T_J_REF_AIR_RFA", 
               joinColumns = { @JoinColumn(name = "RFA_AIR_ID", nullable = false, updatable = false) }, 
               inverseJoinColumns = { @JoinColumn(name = "RFA_REF_ID", nullable = false, updatable = false) })
    @OrderBy("identifier")
    private Set<Reference> references = new HashSet<Reference>(0);

    @ManyToMany(fetch = FetchType.LAZY)
    @JoinTable(name = "T_J_MAN_AIR_MNA", 
               joinColumns = { @JoinColumn(name = "MNA_AIR_ID", nullable = false, updatable = false) }, 
               inverseJoinColumns = { @JoinColumn(name = "MNA_MAN_ID", nullable = false, updatable = false) })
    @OrderBy("type")
    private Set<Manual> manuals = new HashSet<Manual>(0);

    @OneToMany(fetch = FetchType.LAZY, 
               mappedBy = "aircraft",
               cascade = { CascadeType.REMOVE })
    private Set<UserConfig> userConfigs = new HashSet<UserConfig>(0);

}

@Table(name = "T_R_REFERENCE_TYPE_RFT", 
       uniqueConstraints = @UniqueConstraint(columnNames = "RFT_TYPE"))
public class ReferenceType implements java.io.Serializable {

    @Id
    @Column(name = "RFT_ID", unique = true, nullable = false)
    @TableGenerator(name="referenceTypeSeqStore", 
        table="T_S_APP_SEQ_STORE_AST", 
        pkColumnName="AST_SEQ_NAME",
        valueColumnName = "AST_SEQ_VALUE",
        pkColumnValue = "T_R_REFERENCE_TYPE_RFT.RFT_ID", 
        allocationSize=1)
    @GeneratedValue(strategy=GenerationType.TABLE, generator="referenceTypeSeqStore")                   
    private Integer id;

    @Column(name = "RFT_TYPE", unique = true, nullable = false, length = 50)    
    private String type;

    @OneToMany(fetch = FetchType.LAZY, 
               mappedBy = "referenceType", 
               cascade = { CascadeType.REMOVE })    
    private Set<Reference> references = new HashSet<Reference>(0);

    @OneToMany(fetch = FetchType.LAZY, 
               mappedBy = "referenceType",
               cascade = { CascadeType.REMOVE })    
    private Set<UserConfig> userConfigs = new HashSet<UserConfig>(0);

    @Transient
    private String typeTranslated;
}

@Table(name = "T_R_MANUAL_MAN", 
       uniqueConstraints = @UniqueConstraint(columnNames = "MAN_TYPE"))
public class Manual implements java.io.Serializable {

    @Id
    @Column(name = "MAN_ID", unique = true, nullable = false)
    @TableGenerator(name="manualSeqStore", 
        table="T_S_APP_SEQ_STORE_AST", 
        pkColumnName="AST_SEQ_NAME",
        valueColumnName = "AST_SEQ_VALUE",
        pkColumnValue = "T_R_MANUAL_MAN.MAN_ID", 
        allocationSize=1)
    @GeneratedValue(strategy=GenerationType.TABLE, generator="manualSeqStore")                  
    private Integer id;

    @Column(name = "MAN_TYPE", unique = true, nullable = false, length = 50)
    private String type;

    @ManyToMany(fetch = FetchType.LAZY)
    @JoinTable(name = "T_J_MAN_AIR_MNA", 
               joinColumns = { @JoinColumn(name = "MNA_MAN_ID", nullable = false, updatable = false) }, 
               inverseJoinColumns = { @JoinColumn(name = "MNA_AIR_ID", nullable = false, updatable = false) })  
    private Set<Aircraft> aircrafts = new HashSet<Aircraft>(0);

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "manual")
    private Set<Reference> references = new HashSet<Reference>(0);

}

@Table(name = "T_E_TRANSLATION_TRL")
public class Translation implements java.io.Serializable {

    @Id
    @Column(name = "TRL_ID", unique = true, nullable = false)
    @TableGenerator(name="translationSeqStore", 
        table="T_S_APP_SEQ_STORE_AST", 
        pkColumnName="AST_SEQ_NAME",
        valueColumnName = "AST_SEQ_VALUE",
        pkColumnValue = "T_E_TRANSLATION_TRL.TRL_ID", 
        allocationSize=1)
    @GeneratedValue(strategy=GenerationType.TABLE, 
        generator="translationSeqStore")            
    private Integer id;

    @ManyToOne
    @JoinColumn(name = "TRL_REF_ID", nullable = false)
    private Reference reference;

    @ManyToOne
    @JoinColumn(name = "TRL_LAN_ID", nullable = false)  
    private Language language;

    @Column(name = "TRL_LABEL", nullable = false, length = 4000)    
    private String label;

}

@Table(name = "T_R_LANGUAGE_LAN", 
       uniqueConstraints = @UniqueConstraint(columnNames = "LAN_LANG"))
public class Language implements java.io.Serializable {

    @Id
    @Column(name = "LAN_ID", unique = true, nullable = false)
    @TableGenerator(name="langSeqStore", 
        table="T_S_APP_SEQ_STORE_AST", 
        pkColumnName="AST_SEQ_NAME",
        valueColumnName = "AST_SEQ_VALUE",
        pkColumnValue = "T_R_LANGUAGE_LAN.LAN_ID", 
        allocationSize=1)
    @GeneratedValue(strategy=GenerationType.TABLE, generator="langSeqStore")        
    private Integer id;

    @Column(name = "LAN_LANG", unique = true, nullable = false, length = 2) 
    private String lang;
}

我编写了一个JUnit测试，以便创建一个新的引用，其中一些对象已经存储在数据库中。但是每次使用javax.persistence.PersistenceException时，我的insert方法（persist）都会失败：org.hibernate.PersistentObjectException：传递给persist的分离实体。

这是我的Junit测试：

@Test
@Transactional
public void testInsertReference() {

    // Create transient
    Reference reference = new Reference();
    reference.setIdentifier("MYTEST");
    reference.setLink("MYLINK");
    reference.setObservations("MYCOMMENT");

    // get from database
    Manual manual = manualService.getManual("MYMAN");
    ReferenceType refType = referenceTypeService.getReferenceType(1);

    Aircraft aircraft = aircraftService.getAircraft("MYAIR");
    Set<Aircraft> airList = new HashSet<Aircraft>();
    airList.add(aircraft);

    Language langEn = languageService.getLanguage("EN");
    Language langFr = languageService.getLanguage("FR");

    Translation trlEn = new Translation();
    trlEn.setLanguage(langEn);
    trlEn.setLabel("my ref test");

    Translation trlFr = new Translation();
    trlFr.setLanguage(langFr);
    trlFr.setLabel("mon test de ref");

    List<Translation> trlList = new ArrayList<Translation>();
    trlList.add(trlEn);
    trlList.add(trlFr);         

    // Set some relations
    reference.setManual(manual);
    reference.setReferenceType(refType);
    reference.setAircrafts(airList);
    reference.setTranslations(new HashSet<Translation>(trlList));

    // Persist
    reference = referenceService.insertReference(reference);  // which execute : entityManager.persist(entity)
    logger.info(reference.toString());
}

有什么想法吗？

谢谢

堆栈跟踪：

javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: myprog.test.persistence.entity.Aircraft
    at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1365)
    at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1293)
    at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1299)
    at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:865)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:365)
    at $Proxy39.persist(Unknown Source)
    at myprog.test.persistence.dao.impl.GenericDaoImpl.create(GenericDaoImpl.java:54)
    at myprog.test.service.impl.ReferenceServiceImpl.insertReference(ReferenceServiceImpl.java:61)
    at myprog.test.service.impl.ReferenceServiceImpl$$FastClassByCGLIB$$f01500a8.invoke(<generated>)
    at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:689)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:622)
    at myprog.test.service.impl.ReferenceServiceImpl$$EnhancerByCGLIB$$a99de5b.insertReference(<generated>)
    at myprog.test.service.ReferenceServiceTest.testInsertReference(ReferenceServiceTest.java:147)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: myprog.test.persistence.entity.Aircraft
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:141)
    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:802)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:795)
    at org.hibernate.engine.spi.EJB3CascadingAction$1.cascade(EJB3CascadingAction.java:52)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:380)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:323)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
    at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:409)
    at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:350)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:326)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:165)
    at org.hibernate.event.internal.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:448)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:293)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:193)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:136)
    at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:78)
    at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:208)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:151)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:78)
    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:811)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:786)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:790)
    at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:859)
    ... 49 more

1 个答案:

答案 0 :(得分：1)

从数据库中获取对象ReferenceType和Aircraft后，PersistenceManager不再管理这些对象，这就是分离对象的含义。

如果您需要这样做，您必须重新附加ReferenceService中的已恢复实体，您可以使用此方法：

Aircraft a = em.getReference(Aircraft.class, reference.getAircraft().getId());

在调用persist之前，你必须对所有分离的实体执行此操作，请记住在恢复后再次将它们设置为引用对象：

reference.setAircraft(a);

有时候问题也是因为你有双向关联引起的，但你没有设置它们的两面。

您可以在此处找到有关它的更多信息：

http://java.dzone.com/articles/saving_detatched_entities

此致

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