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hibernate
 Post subject: Integer statt Objekt für Objektreferenz
PostPosted: Fri Mar 12, 2010 4:19 am 
Newbie

Joined: Thu May 20, 2004 4:51 am
Posts: 4
Es existierte eine 1:n-Beziehung zwischen den Klassen C und P.
Die Beziehung zu dem Objekt P wurde durch den Typ Integer ersetzt (nur die Fremdschlüssel-ID).
Nach dieser Umstellung tritt allerdings ein Fehler auf, den ich unten angefügt habe. Funktioniert eine Referenzierung auf die Zielklasse P grundsätzlich nur mit einem Objekt P? Oder lässt es sich auch über einen Integer realisieren?

Codeausschnitt aus Klasse C:
Code:
    @ManyToOne (targetEntity = P.class)
    @JoinColumn(name = "FK_P", insertable = true, updatable = true, nullable = false)
    private Integer pId;


Codeausschnitt aus Klasse P:
Code:
    @OneToMany(mappedBy = "pId")
    @org.hibernate.annotations.Cascade({org.hibernate.annotations.CascadeType.ALL, org.hibernate.annotations.CascadeType.DELETE_ORPHAN})
    private Set<C> cList = new HashSet<C>();


Fehlermeldung:

Code:
ERROR [STDERR] org.hibernate.PropertyAccessException: could not set a field value by reflection setter of d.i.a.d.C.pId
   at org.hibernate.property.DirectPropertyAccessor$DirectSetter.set(DirectPropertyAccessor.java:114)
   at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:360)
   at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:221)
   at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3594)
   at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:152)
   at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:877)
   at org.hibernate.loader.Loader.doQuery(Loader.java:752)
   at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
   at org.hibernate.loader.Loader.loadCollection(Loader.java:2015)
   at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:59)
   at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:587)
   at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:83)
   at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1743)
   at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:366)
   at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:108)
   at org.hibernate.collection.PersistentSet.iterator(PersistentSet.java:186)
   at java.util.Collections$UnmodifiableCollection$1.<init>(Collections.java:1007)
   at java.util.Collections$UnmodifiableCollection.iterator(Collections.java:1006)
   at d.i.a.s.AbstractBean.preloadClass(AbstractBean.java:104)
   at d.i.a.s.AbstractBean.preloadClass(AbstractBean.java:167)
   at d.i.a.s.PMgmtBean.getPList(PMgmtBean.java:201)
   at d.i.a.s.PMgmtBean.saveP(PMgmtBean.java:359)
   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.jboss.aop.joinpoint.MethodInvocation.invokeTarget(MethodInvocation.java:122)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:111)
   at org.jboss.ejb3.EJBContainerInvocationWrapper.invokeNext(EJBContainerInvocationWrapper.java:69)
   at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor$InvocationContext.proceed(InvocationContextInterceptor.java:138)
   at d.i.a.s.interceptors.AbstractBeanInterceptor.logInvokingTime(AbstractBeanInterceptor.java:57)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.jboss.ejb3.interceptors.aop.EJB3InterceptorInterceptor.invoke(EJB3InterceptorInterceptor.java:83)
   at org.jboss.ejb3.interceptors.aop.EJB3InterceptorInterceptor.invoke(EJB3InterceptorInterceptor.java:70)
   at org.jboss.ejb3.EJBContainerInvocationWrapper.invokeNext(EJBContainerInvocationWrapper.java:59)
   at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor$InvocationContext.proceed(InvocationContextInterceptor.java:138)
   at d.i.a.s.interceptors.AbstractBeanInterceptor.logError(AbstractBeanInterceptor.java:38)
   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.jboss.ejb3.interceptors.aop.EJB3InterceptorInterceptor.invoke(EJB3InterceptorInterceptor.java:83)
   at org.jboss.ejb3.interceptors.aop.EJB3InterceptorInterceptor.invoke(EJB3InterceptorInterceptor.java:70)
   at org.jboss.ejb3.EJBContainerInvocationWrapper.invokeNext(EJBContainerInvocationWrapper.java:59)
   at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.invoke(InterceptorSequencer.java:73)
   at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.aroundInvoke(InterceptorSequencer.java:59)
   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.jboss.aop.advice.PerJoinpointAdvice.invoke(PerJoinpointAdvice.java:174)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.fillMethod(InvocationContextInterceptor.java:72)
   at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_fillMethod_13340610.invoke(InvocationContextInterceptor_z_fillMethod_13340610.java)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.setup(InvocationContextInterceptor.java:88)
   at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_setup_13340610.invoke(InvocationContextInterceptor_z_setup_13340610.java)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:62)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:56)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:68)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
   at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:190)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.security.RunAsSecurityInterceptorv2.invoke(RunAsSecurityInterceptorv2.java:94)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.security.RoleBasedAuthorizationInterceptorv2.invoke(RoleBasedAuthorizationInterceptorv2.java:201)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:186)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:67)
   at org.jboss.aop.joinpoint.MethodI
08:42:08,359 ERROR [STDERR] nvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
   at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:487)
   at org.jboss.ejb3.session.InvokableContextClassProxyHack._dynamicInvoke(InvokableContextClassProxyHack.java:53)
   at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:91)
   at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
   at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:908)
   at org.jboss.remoting.transport.socket.ServerThread.completeInvocation(ServerThread.java:742)
   at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:695)
   at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:522)
   at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:230)
Caused by: java.lang.IllegalArgumentException: Can not set int field d.i.a.d.C.pId to d.i.a.d.P
   at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:146)
   at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:150)
   at sun.reflect.UnsafeIntegerFieldAccessorImpl.set(UnsafeIntegerFieldAccessorImpl.java:80)
   at java.lang.reflect.Field.set(Field.java:657)
   at org.hibernate.property.DirectPropertyAccessor$DirectSetter.set(DirectPropertyAccessor.java:102)
   ... 98 more
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Serethos
 Post subject: Re: Integer statt Objekt für Objektreferenz
PostPosted: Mon Mar 15, 2010 11:31 am 
Beginner
Beginner

Joined: Thu Oct 04, 2007 12:22 pm
Posts: 48
Wenn ich Dich richtig verstanden habe, möchtest Du die Fremdschlüsselbeziehung nur über das Schlüsselattribut (in Deinem Fall ein Integerwert) mappen und nicht über das referenzierte Objekt selbst(!?)
Die Exception zeigt ja bereits, dass das reflektiven Setzen des Schlüsselattributes fehlschlägt, weil die Typen nicht kompatibel sind. Soweit ich weiß ist es nicht möglich, anders zu referenzieren, als über das Objekt selbst.
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