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社区首页 >问答首页 >如何修复org.hibernate.LazyInitializationException和org.hibernate.WrongClassException:使用faktor

问如何修复org.hibernate.LazyInitializationException和org.hibernate.WrongClassException:使用faktor
EN

Stack Overflow用户
提问于 2022-05-18 14:24:12
回答 1查看 93关注 0票数 1

我试图将持久性添加到一个faktor项目中，该项目基于https://www.faktorzehn.org的入门教程。我有一个模型对象，看起来如下：

代码语言：javascript
复制
@Entity
public class Angebot {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "native")
    @GenericGenerator(name = "native", strategy = "native")
    private Integer id;
    private String angebotNr;
    private String produktname;
    private LocalDate wirksamAb;
    
    @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    private HausratVertrag hausratVertrag;

    /**
     * Erstellt ein neues Angebot {@code Angebot} f�r das gew�hlte
     * Hausrat-Produkt zu dem angegeben Wirksamkeitsdatum.
     * 
     * @param angebotNr
     *            eine Angebotsnummer.
     * @param hausratProdukt
     *            ein Hausratprodukt.
     * @param wirksamkeitsdatum
     *            das Wirksamkeitsdatum.
     */
    
    public Angebot(String angebotNr,HausratProdukt hausratProdukt, LocalDate wirksamAb) {
        this.angebotNr = angebotNr;
        this.wirksamAb = wirksamAb;
    }
    
    public Angebot() {}

    public String getAngebotNr() {
        return angebotNr;
    }

    public void setAngebotNr(String angebotNr) {
        this.angebotNr = angebotNr;
    }

    public String getProduktname() {
        return produktname;
    }

    public void setProduktname(String produktname) {
        this.produktname = produktname;
    }

    public LocalDate getWirksamAb() {
        return wirksamAb;
    }

    public void setWirksamAb(LocalDate wirksamAb) {
        this.wirksamAb = wirksamAb;
    }

    /**
     * Liefert den Hausratvertrag
     * 
     * @return Hausratvertrag
     */
    public HausratVertrag getHausratVertrag() {
        return hausratVertrag;
    }

    public void setHausratVertrag(HausratVertrag hausratVertrag) {
        this.hausratVertrag = hausratVertrag;
    }


    @Transient
    private HausratProdukt selectedProdukt;
    public HausratProdukt getProdukt() {
        if (produktname !=null) {
            IProductComponent pc = Utils.getRuntimeRepository().getProductComponent(this.getProduktname());
            return (HausratProdukt) pc;
        }else {
            return selectedProdukt;
        }
    }
    
    public void setProdukt(HausratProdukt selectedProduct) {
        this.selectedProdukt = selectedProduct;
    }
    

    /**
     * Berechnet die Beitraege neu und
     */
    public void neuBerechnen() {
        hausratVertrag.berechneJahresbasisbeitrag();
    }
    
    

    @Override
    public String toString() {
        StringBuffer sb = new StringBuffer();
        sb.append("Angebot(produktName=").append(getProdukt().getProduktName()).append(")");
        return sb.toString();
    }

    public Integer getId() {
        return id;
    }
    
}

这个数据库有三个表

安杰波特: ID：|---|------------|------------|-------------------| ANGEBOT_NR，PRODUKTNAME，HAUSRAT_VERTRAG_ID|，HAUSRAT_VERTRAG_ID|，33，Kompakt，，beispiel.HR，01 Kompakt 2022-01，33-VERTRAG：\x{e76f}\x{e76f}.\x{e76f}.\x\x{e76f}\x{e76f}.

该项目的基本工作方式是，合同(hausratVertrag)可以有一个基本覆盖范围(数据库中标记为typ = HRG_DECKUNG )和0或多个额外覆盖范围(Zusatsdeckung -在数据库中标记typ = HRZ_DECKUNG，但我的数据库没有保存)。对象"Angebot“与HausratVertrag有一对一的关系，HausratVertrag与HausratGrunddeckung有一对一的关系，与HausratZusatzdeckung有一对多的关系。就像这样：

代码语言：javascript
复制
    /**
     * Membervariable fuer die Beziehung HausratGrunddeckung.
     * 
     * @since 0.0.1
     *
     * @generated NOT
     * @customizedAnnotations CONTENT-CHANGED
     */
    @OneToOne(mappedBy = "hausratVertrag", fetch = FetchType.EAGER, targetEntity = HausratGrunddeckung.class, cascade = CascadeType.ALL)
    private HausratGrunddeckung hausratGrunddeckung = null;
    /**
     * Membervariable fuer die Beziehung HausratZusatzdekung.
     * 
     * @since 0.0.1
     *
     * @generated
     * 
     */
    @OneToMany(mappedBy = "hausratVertrag", fetch = FetchType.LAZY, targetEntity = HausratZusatzdekung.class)
    private List<HausratZusatzdekung> hausratZusatzdekungen = new ArrayList<>();

我的问题是，当我试图从数据库加载一个"Angebot“时，我会得到以下错误。

代码语言：javascript
复制
com.vaadin.server.ServerRpcManager$RpcInvocationException: Unable to invoke method click in com.vaadin.shared.ui.button.ButtonServerRpc
    at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:159)
    at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:116)
    at com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:442)
    at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:407)
    
...

    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:155)
    ... 46 more
Caused by: com.vaadin.event.ListenerMethod$MethodException: Invocation of method buttonClick in org.linkki.core.ui.aspects.ButtonInvokeAspectDefinition$$Lambda$300/0x0000000800812440 failed.
    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:726)
    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:399)
    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:363)
    at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:1190)
    at com.vaadin.ui.Button.fireClick(Button.java:384)
    at com.vaadin.ui.Button$1.click(Button.java:57)
    ... 51 more
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.linkki_framework.fips.Hausrat_linkki_app.model.hasurat.HausratVertrag.hausratZusatzdekungen, could not initialize proxy - no Session
    at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:587)
    at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:204)
    at org.hibernate.collection.internal.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:148)
    at org.hibernate.collection.internal.PersistentBag.size(PersistentBag.java:261)
    at org.linkki_framework.fips.Hausrat_linkki_app.model.hasurat.HausratVertrag.getNumOfHausratZusatzdekungen(HausratVertrag.java:467)
    at org.linkki_framework.fips.Hausrat_linkki_app.model.hasurat.HausratVertrag.getNumOfDeckungenInternal(HausratVertrag.java:623)
    at org.linkki_framework.fips.Hausrat_linkki_app.model.hasurat.HausratVertrag.getDeckungen(HausratVertrag.java:597)
    at org.linkki_framework.fips.Hausrat_linkki_app.page.VertragPage.<init>(VertragPage.java:39)
    at org.linkki_framework.fips.Hausrat_linkki_app.view.VertragView.enter(VertragView.java:43)
    at com.vaadin.navigator.Navigator.performNavigateTo(Navigator.java:778)
    at com.vaadin.navigator.Navigator.lambda$navigateTo$9a874efd$1(Navigator.java:702)
    at com.vaadin.navigator.ViewBeforeLeaveEvent.navigate(ViewBeforeLeaveEvent.java:54)
    at com.vaadin.navigator.View.beforeLeave(View.java:79)
    at com.vaadin.navigator.Navigator.runAfterLeaveConfirmation(Navigator.java:730)
    at com.vaadin.navigator.Navigator.navigateTo(Navigator.java:701)
    at com.vaadin.navigator.Navigator.navigateTo(Navigator.java:678)
    at org.linkki_framework.fips.Hausrat_linkki_app.pmo.AngebotSectionPmo.send(AngebotSectionPmo.java:83)
    at org.linkki.core.binding.dispatcher.reflection.accessor.InvokeMethod.invoke(InvokeMethod.java:61)
    at org.linkki.core.binding.dispatcher.reflection.accessor.PropertyAccessor.invoke(PropertyAccessor.java:75)
    at org.linkki.core.binding.dispatcher.reflection.ReflectionPropertyDispatcher.invoke(ReflectionPropertyDispatcher.java:154)
    at org.linkki.core.binding.dispatcher.reflection.ReflectionPropertyDispatcher.push(ReflectionPropertyDispatcher.java:127)
    at org.linkki.core.binding.dispatcher.AbstractPropertyDispatcherDecorator.push(AbstractPropertyDispatcherDecorator.java:70)
    at org.linkki.core.binding.dispatcher.AbstractPropertyDispatcherDecorator.push(AbstractPropertyDispatcherDecorator.java:70)
    at org.linkki.core.ui.aspects.ButtonInvokeAspectDefinition.lambda$initModelUpdate$7e820d24$1(ButtonInvokeAspectDefinition.java:45)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:706)
    ... 56 more

当我将自动生成的hausratZusatzdeckungen注释更改为FetchType.EAGER时，会得到一个不同的错误：

代码语言：javascript
复制
com.vaadin.server.ServerRpcManager$RpcInvocationException: Unable to invoke method click in com.vaadin.shared.ui.button.ButtonServerRpc
    at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:159)
    at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:116)
    
...

    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:155)
    ... 46 more
Caused by: com.vaadin.event.ListenerMethod$MethodException: Invocation of method buttonClick in org.linkki.core.ui.aspects.ButtonInvokeAspectDefinition$$Lambda$300/0x000000080082a840 failed.
    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:726)
    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:399)
    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:363)
    at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:1190)
    at com.vaadin.ui.Button.fireClick(Button.java:384)
    at com.vaadin.ui.Button$1.click(Button.java:57)
    ... 51 more
Caused by: org.springframework.orm.ObjectRetrievalFailureException: Object [id=33] was not of the specified subclass [org.linkki_framework.fips.Hausrat_linkki_app.model.hasurat.HausratGrunddeckung] : loaded object was of wrong class class org.linkki_framework.fips.Hausrat_linkki_app.model.hasurat.HausratZusatzdekung; nested exception is org.hibernate.WrongClassException: Object [id=33] was not of the specified subclass [org.linkki_framework.fips.Hausrat_linkki_app.model.hasurat.HausratGrunddeckung] : loaded object was of wrong class class org.linkki_framework.fips.Hausrat_linkki_app.model.hasurat.HausratZusatzdekung
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:313)
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:244)
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:491)
    at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59)
    at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:133)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:57)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
    at com.sun.proxy.$Proxy122.findById(Unknown Source)
    at org.linkki_framework.fips.Hausrat_linkki_app.HrService.findAngebotById(HrService.java:25)
    at org.linkki_framework.fips.Hausrat_linkki_app.view.VertragView.enter(VertragView.java:37)
    at com.vaadin.navigator.Navigator.performNavigateTo(Navigator.java:778)
    at com.vaadin.navigator.Navigator.lambda$navigateTo$9a874efd$1(Navigator.java:702)
    at com.vaadin.navigator.ViewBeforeLeaveEvent.navigate(ViewBeforeLeaveEvent.java:54)
    at com.vaadin.navigator.View.beforeLeave(View.java:79)
    at com.vaadin.navigator.Navigator.runAfterLeaveConfirmation(Navigator.java:730)
    at com.vaadin.navigator.Navigator.navigateTo(Navigator.java:701)
    at com.vaadin.navigator.Navigator.navigateTo(Navigator.java:678)
    at org.linkki_framework.fips.Hausrat_linkki_app.pmo.AngebotSectionPmo.send(AngebotSectionPmo.java:86)
    at org.linkki.core.binding.dispatcher.reflection.accessor.InvokeMethod.invoke(InvokeMethod.java:61)
    at org.linkki.core.binding.dispatcher.reflection.accessor.PropertyAccessor.invoke(PropertyAccessor.java:75)
    at org.linkki.core.binding.dispatcher.reflection.ReflectionPropertyDispatcher.invoke(ReflectionPropertyDispatcher.java:154)
    at org.linkki.core.binding.dispatcher.reflection.ReflectionPropertyDispatcher.push(ReflectionPropertyDispatcher.java:127)
    at org.linkki.core.binding.dispatcher.AbstractPropertyDispatcherDecorator.push(AbstractPropertyDispatcherDecorator.java:70)
    at org.linkki.core.binding.dispatcher.AbstractPropertyDispatcherDecorator.push(AbstractPropertyDispatcherDecorator.java:70)
    at org.linkki.core.ui.aspects.ButtonInvokeAspectDefinition.lambda$initModelUpdate$7e820d24$1(ButtonInvokeAspectDefinition.java:45)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:706)
    ... 56 more
Caused by: org.hibernate.WrongClassException: Object [id=33] was not of the specified subclass [org.linkki_framework.fips.Hausrat_linkki_app.model.hasurat.HausratGrunddeckung] : loaded object was of wrong class class org.linkki_framework.fips.Hausrat_linkki_app.model.hasurat.HausratZusatzdekung
    at org.hibernate.loader.Loader.instanceAlreadyLoaded(Loader.java:1582)
    at org.hibernate.loader.Loader.getRow(Loader.java:1533)
    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:727)
    at org.hibernate.loader.Loader.processResultSet(Loader.java:972)
    at org.hibernate.loader.Loader.doQuery(Loader.java:930)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:306)
    at org.hibernate.loader.Loader.loadEntity(Loader.java:2204)
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:60)
    at org.hibernate.loader.entity.EntityLoader.loadByUniqueKey(EntityLoader.java:143)
    at org.hibernate.persister.entity.AbstractEntityPersister.loadByUniqueKey(AbstractEntityPersister.java:2122)
    at org.hibernate.type.EntityType.loadByUniqueKey(EntityType.java:692)
    at org.hibernate.type.EntityType.resolve(EntityType.java:434)
    at org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:154)
    at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:128)
    at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.performTwoPhaseLoad(AbstractRowReader.java:238)
    at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.finishUp(AbstractRowReader.java:209)
    at org.hibernate.loader.plan.exec.process.internal.ResultSetProcessorImpl.extractResults(ResultSetProcessorImpl.java:133)
    at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:122)
    at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:86)
    at org.hibernate.loader.entity.plan.AbstractLoadPlanBasedEntityLoader.load(AbstractLoadPlanBasedEntityLoader.java:167)
    at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3967)
    at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:508)
    at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:478)
    at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219)
    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278)
    at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121)
    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89)
    at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1129)
    at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1022)
    at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:639)
    at org.hibernate.type.EntityType.resolve(EntityType.java:431)
    at org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:154)
    at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:128)
    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1133)
    at org.hibernate.loader.Loader.processResultSet(Loader.java:992)
    at org.hibernate.loader.Loader.doQuery(Loader.java:930)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)
    at org.hibernate.loader.Loader.doList(Loader.java:2617)
    at org.hibernate.loader.Loader.doList(Loader.java:2600)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2429)
    at org.hibernate.loader.Loader.list(Loader.java:2424)
    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:501)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:371)
    at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216)
    at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1326)
    at org.hibernate.internal.QueryImpl.list(QueryImpl.java:87)
    at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:606)
    at org.hibernate.jpa.internal.QueryImpl.getSingleResult(QueryImpl.java:529)
    at org.hibernate.jpa.criteria.compile.CriteriaQueryTypeQueryAdapter.getSingleResult(CriteriaQueryTypeQueryAdapter.java:54)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.springframework.orm.jpa.SharedEntityManagerCreator$DeferredQueryInvocationHandler.invoke(SharedEntityManagerCreator.java:372)
    at com.sun.proxy.$Proxy149.getSingleResult(Unknown Source)
    at org.springframework.data.jpa.repository.query.JpaQueryExecution$SingleEntityExecution.doExecute(JpaQueryExecution.java:206)
    at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:85)
    at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:116)
    at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:106)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:483)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:461)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
    ... 87 more

因此，我的理解是，从数据库加载的是"HasuratZusatzdeckung“的实例，而不是"HausratGrunddeckung”的实例，这正是我真正想要的。我觉得这很奇怪，因为我甚至没有在数据库中保存一个"HausratZusatzdeckung“，而只有一个"HausratGrunddeckung”。我手动将faktor代码生成器生成的注释从FetchType.LAZY更改为FetchType.EAGER是否有问题？另外，对于属性"hausratGrunddeckung“的注释，我将CascadeType.ALL添加到最初生成的注释中。这有问题吗？如果您能帮助我理解为什么会发生这个错误，以及如何修复它，我将非常感激。

我的HausratGrunddeckung的代码是

代码语言：javascript
复制
@Entity
@DiscriminatorValue("HRG_DECKUNG")
@IpsPolicyCmptType(name = "hasurat.HausratGrunddeckung")
@IpsAttributes({ "beitragGemaessZahlweise" })
@IpsAssociations({ "HausratVertrag" })
@IpsConfiguredBy(HausratGrunddeckungstyp.class)
@IpsDocumented(bundleName = "org.linkki_framework.fips.Hausrat_linkki_app.model.modell-label-and-descriptions", defaultLocale = "de")
public class HausratGrunddeckung extends Deckung {

    /**
     * Diese Konstante enthaelt den Namen der Beziehung hausratVertrag.
     * 
     * @since 0.0.1
     *
     * @generated
     */
    public static final String ASSOCIATION_HAUSRAT_VERTRAG = "hausratVertrag";

    /**
     * Diese Konstante enthaelt den Namen der Eigenschaft beitragGemaessZahlweise.
     * 
     * @since 0.0.1
     *
     * @generated
     */
    public static final String PROPERTY_BEITRAGGEMAESSZAHLWEISE = "beitragGemaessZahlweise";

    /**
     * Membervariable fuer das Parent-Objekt: HausratVertrag.
     * 
     * @since 0.0.1
     *
     * @generated
     */
    @OneToOne(fetch = FetchType.EAGER, targetEntity = HausratVertrag.class)
    @JoinColumn(name = "VERTRAG_ID")
    private HausratVertrag hausratVertrag;
...
}

我的HausratZusatzdeckung的代码是

代码语言：javascript
复制
@Entity
@DiscriminatorValue("HRZ_DECKUNG")
@IpsPolicyCmptType(name = "hasurat.HausratZusatzdekung")
@IpsAttributes({ "versSumme" })
@IpsAssociations({ "HausratVertrag" })
@IpsConfiguredBy(HausratZusatzdekungstyp.class)
@IpsDocumented(bundleName = "org.linkki_framework.fips.Hausrat_linkki_app.model.modell-label-and-descriptions", defaultLocale = "de")
public class HausratZusatzdekung extends Deckung {

    /**
     * Diese Konstante enthaelt den Namen der Beziehung hausratVertrag.
     * 
     * @since 0.0.1
     *
     * @generated
     */
    public static final String ASSOCIATION_HAUSRAT_VERTRAG = "hausratVertrag";

    /**
     * Diese Konstante enthaelt den Namen der Eigenschaft versSumme.
     * 
     * @since 0.0.1
     *
     * @generated
     */
    public static final String PROPERTY_VERSSUMME = "versSumme";

    /**
     * Membervariable fuer das Parent-Objekt: HausratVertrag.
     * 
     * @since 0.0.1
     *
     * @generated
     */
    @ManyToOne(fetch = FetchType.LAZY, targetEntity = HausratVertrag.class)
    @JoinColumn(name = "VERTRAG_ID")
    private HausratVertrag hausratVertrag;
...
}

生成代码的模型类如下所示：

Deckung：HausratGrunddeckung和HasuratZusatzdeckung的父级

​

hibernate
persistence
faktor-ips
EN

回答 1

Stack Overflow用户

回答已采纳

发布于 2022-05-18 15:38:58

尝试用Angebot包装加载@Transactional的方法，以便在延迟加载共享位置时存在会话。异常告诉您，您正在尝试不使用could not initialize proxy - no Session加载关联，而不使用事务(会话)。

我建议您研究一下Hibernate维护人员Vlad的这篇文章，他在这里展示了处理LazyInitializationException的最佳方法。急切的抓取绝对不是要走的路，事实上它实际上是被认为是一种代码气味。除了Vlad描述的join fetch方法(您需要一个JPQL查询)之外，您还可以使用Spring EntityGraph注释来急切地获取某些关联(这里的例子)。

关于你的第二个问题:我不太明白你所说的“自动生成注释”是什么意思。Java注释不能在运行时自动生成或添加，它需要在编译代码之前放置。您可以尝试在关联注释中省略targetEntity属性，到目前为止，我从来不需要这个属性，而且我认为您不需要它，因为Javadoc声明了Optional only if the collection property is defined using Java generics.。您还可以显示HausratGrunddeckung和HausratZusatzdekung类的代码吗？

票数 1
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/72290998

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