hibernate - Failed to lazily initialize a collection, no session or session was closed (despite eagerly fetching)

Question

Okay, I get the above exception in an application I'm working on. I am using JPA and hibernate. Here is the stacktrace:

WARNING: #{commissionController.saveCommission}: javax.persistence.PersistenceException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection, no session or session was closed
javax.faces.FacesException: #{commissionController.saveCommission}: javax.persistence.PersistenceException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection, no session or session was closed
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
    at org.apache.myfaces.extensions.cdi.jsf.impl.security.SecurityViolationAwareActionListener.processAction(SecurityViolationAwareActionListener.java:56)
    at org.apache.myfaces.extensions.cdi.jsf.impl.config.view.ViewControllerActionListener.processAction(ViewControllerActionListener.java:68)
    at org.apache.myfaces.extensions.cdi.jsf.impl.listener.action.CodiActionListener.processAction(CodiActionListener.java:58)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at org.apache.myfaces.extensions.cdi.jsf2.impl.listener.phase.CodiLifecycleWrapper.execute(CodiLifecycleWrapper.java:95)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)
Caused by: javax.faces.el.EvaluationException: javax.persistence.PersistenceException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection, no session or session was closed
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    ... 27 more
Caused by: javax.persistence.PersistenceException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection, no session or session was closed
    at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1377)
    at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1300)
    at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1306)
    at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:888)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.jboss.weld.bean.proxy.AbstractBeanInstance.invoke(AbstractBeanInstance.java:45)
    at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:105)
    at org.jboss.weld.proxies.EntityManager$1148094400$Proxy$_$$_WeldClientProxy.merge(EntityManager$1148094400$Proxy$_$$_WeldClientProxy.java)
    at se.raindance.persistence.RaindanceBaseHomeImpl.update(RaindanceBaseHomeImpl.java:57)
    at se.raindance.purchasecommission.home.CommissionHome.update(CommissionHome.java:59)
    at se.raindance.purchasecommission.home.CommissionHome$Proxy$_$$_WeldSubclass.update(CommissionHome$Proxy$_$$_WeldSubclass.java)
    at se.raindance.persistence.RaindanceBaseHomeImpl.persist(RaindanceBaseHomeImpl.java:67)
    at se.raindance.purchasecommission.home.CommissionHome.persist(CommissionHome.java:43)
    at se.raindance.purchasecommission.home.CommissionHome$Proxy$_$$_WeldSubclass.persist(CommissionHome$Proxy$_$$_WeldSubclass.java)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.jboss.weld.interceptor.proxy.SimpleInterceptionChain.invokeNextInterceptor(SimpleInterceptionChain.java:85)
    at org.jboss.weld.interceptor.proxy.InterceptorInvocationContext.proceed(InterceptorInvocationContext.java:127)
    at org.apache.myfaces.extensions.cdi.jpa.impl.transaction.TransactionalInterceptorStrategy.execute(TransactionalInterceptorStrategy.java:125)
    at org.apache.myfaces.extensions.cdi.jpa.impl.transaction.TransactionalInterceptor.executeInTransaction(TransactionalInterceptor.java:54)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.jboss.weld.interceptor.proxy.SimpleMethodInvocation.invoke(SimpleMethodInvocation.java:30)
    at org.jboss.weld.interceptor.proxy.SimpleInterceptionChain.invokeNextInterceptor(SimpleInterceptionChain.java:69)
    at org.jboss.weld.interceptor.proxy.InterceptorMethodHandler.executeInterception(InterceptorMethodHandler.java:112)
    at org.jboss.weld.interceptor.proxy.InterceptorMethodHandler.invoke(InterceptorMethodHandler.java:88)
    at org.jboss.weld.bean.proxy.CombinedInterceptorAndDecoratorStackMethodHandler.invoke(CombinedInterceptorAndDecoratorStackMethodHandler.java:55)
    at se.raindance.purchasecommission.home.CommissionHome$Proxy$_$$_WeldSubclass.persist(CommissionHome$Proxy$_$$_WeldSubclass.java)
    at se.raindance.purchasecommission.controller.CommissionController.saveCommission(CommissionController.java:139)
    at se.raindance.purchasecommission.controller.CommissionController$Proxy$_$$_WeldClientProxy.saveCommission(CommissionController$Proxy$_$$_WeldClientProxy.java)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.apache.el.parser.AstValue.invoke(AstValue.java:278)
    at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)
    at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:39)
    at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    ... 28 more
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection, no session or session was closed
    at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:489)
    at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:447)
    at org.hibernate.collection.internal.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:139)
    at org.hibernate.collection.internal.PersistentBag.isEmpty(PersistentBag.java:249)
    at se.raindance.purchasecommission.domain.Form.removeHiddenFields(Form.java:197)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.hibernate.ejb.event.BeanCallback.invoke(BeanCallback.java:39)
    at org.hibernate.ejb.event.EntityCallbackHandler.callback(EntityCallbackHandler.java:110)
    at org.hibernate.ejb.event.EntityCallbackHandler.postLoad(EntityCallbackHandler.java:103)
    at org.hibernate.ejb.event.EJB3PostLoadEventListener.onPostLoad(EJB3PostLoadEventListener.java:49)
    at org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:292)
    at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:134)
    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:999)
    at org.hibernate.loader.Loader.doQuery(Loader.java:878)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:293)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:263)
    at org.hibernate.loader.Loader.loadEntity(Loader.java:1977)
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:82)
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:72)
    at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3821)
    at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:458)
    at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:427)
    at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:204)
    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:260)
    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:148)
    at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1079)
    at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:1006)
    at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:613)
    at org.hibernate.type.EntityType.resolve(EntityType.java:441)
    at org.hibernate.type.EntityType.replace(EntityType.java:298)
    at org.hibernate.type.AbstractType.replace(AbstractType.java:178)
    at org.hibernate.type.TypeHelper.replace(TypeHelper.java:211)
    at org.hibernate.event.internal.DefaultMergeEventListener.copyValues(DefaultMergeEventListener.java:409)
    at org.hibernate.event.internal.DefaultMergeEventListener.entityIsTransient(DefaultMergeEve

Answer 1

This was caused by a bug in Hibernate. Found it here: http://issues.jboss.org/browse/JBAS-5474

It works from version 4.1.8 (https://hibernate.onjira.com/browse/HHH-6043)

The problem is with the @PostLoad, which apparently doesn't do things in the right order.