JPA：如何堅持與一些級聯關係的對象？仍然是Javax.persistence.PersistenceException ...

我已經做了很多研究，但是我沒有找到真正的答案來解決我的問題。JPA：如何堅持與一些級聯關係的對象？仍然是Javax.persistence.PersistenceException ...

我想創建一個有很多關係的對象，並堅持下去。

我的實體是：在引用類型上定義的引用，鏈接到手冊（也許可以爲null）。該參考文獻是爲一架或多架飛機定義的，並有一些翻譯。

爲了方便起見，我爲級聯和orphelanRemoval放了一些註釋。

這裏的代碼。

@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; 
}

我編寫了一個JUnit測試，以創建一個已經存儲在數據庫中的一些對象的新引用。但是我的插入方法（persist）每次都有一個javax.persistence.PersistenceException失敗：org.hibernate.PersistentObjectException：傳遞給persist的分離實體。

這裏我的JUnit測試：

@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()); 
}

任何想法？

謝謝

堆棧跟蹤：

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

來源

2012-08-22 MychaL

有什麼異常的堆棧跟蹤？哪個實體被分離？ – dcernahoschi

它似乎是飛機的對象。有一件事我不明白：當我們從db獲得一個對象時，它是一個分離的對象，導致併發訪問可以修改它。那麼，在95％的情況下，我們不能使用「堅持」，而是「合併」？唯一使用堅持的情況是全部是瞬態對象？謝謝。 – MychaL

服務是否使用相同的EntityManager實例？所以他們在相同的持久性上下文中？ – dcernahoschi

一旦你從數據庫中獲取這些都不再由PersistenceManager的管理的對象引用類型和飛機，那是超脫的意義目的。

如果你需要做到這一點，你必須重新連接恢復實體在ReferenceService，你可以用這個方法：

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

你必須與所有分離的實體做這個調用persist之前，記得要重新設置你的參照物一旦恢復：

reference.setAircraft(a);

有時候問題也引起了，因爲你有雙向關聯，但你不設置它們的兩側。

你可以在這裏找到更多關於它的信息：

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

問候

來源

2012-08-22 20:07:44 gersonZaragocin

最大的問題是：爲什麼他們分離考慮我在同一個junit測試中從db獲得它們？爲此，我的服務使用'entityManager.find（entityClass，id）'或JPQL命名查詢。 – MychaL

單元測試是一個客戶端。我假設你正在將這些服務作爲無狀態會話bean來實現。只要被調用的方法處於活動狀態，那些bean就維護事務，一旦它完成連接釋放，您就不會有機會維護它。我不確定JUnit測試中的Transactional註釋是如何工作的，但請記住它取決於EJB服務中定義的@TransactionalAttribute。 – gersonZaragocin

JPA：如何堅持與一些級聯關係的對象？仍然是Javax.persistence.PersistenceException ...

回答

相關問題