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laredotornado
 Post subject: org.hibernate.loader.MultipleBagFetchException: cannot simul
PostPosted: Tue Jan 19, 2010 11:11 am 
Newbie

Joined: Wed Oct 14, 2009 3:22 pm
Posts: 16
Hi,

I'm using Hibernate 3.3.2.ga, tools 3.2.0, and annotations 3.4.0.GA on a Resin 3.0.19 app server (Java 1.5). I am dying with the exception, "org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags" when trying to initialize a session. A thread that is six years old implies I should change some other models to do LAZY instead of EAGER fetching but I'm not sure how that applies here since I'm not fetching anything yet.

Here's the call I'm making ...

Code:
Session session = sessionFactory.openSession()


And here's the error. Any advice? - Dave

Code:
ERROR [myco.dor.online.interlock.service.ejb.ReportsServiceBean, main 2010-01-19 08:02:08,373]:
=>ReportsServiceBean.getFinancialAssistanceReport() : Failed to generate trading partner report
org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags
   at org.hibernate.loader.BasicLoader.postInstantiate(BasicLoader.java:94)
   at org.hibernate.loader.entity.EntityLoader.<init>(EntityLoader.java:98)
   at org.hibernate.loader.entity.EntityLoader.<init>(EntityLoader.java:66)
   at org.hibernate.loader.entity.EntityLoader.<init>(EntityLoader.java:56)
   at org.hibernate.loader.entity.BatchingEntityLoader.createBatchingEntityLoader(BatchingEntityLoader.java:126)
   at org.hibernate.persister.entity.AbstractEntityPersister.createEntityLoader(AbstractEntityPersister.java:1765)
   at org.hibernate.persister.entity.AbstractEntityPersister.createEntityLoader(AbstractEntityPersister.java:1769)
   at org.hibernate.persister.entity.AbstractEntityPersister.createLoaders(AbstractEntityPersister.java:3002)
   at org.hibernate.persister.entity.AbstractEntityPersister.postInstantiate(AbstractEntityPersister.java:2995)
   at org.hibernate.persister.entity.SingleTableEntityPersister.postInstantiate(SingleTableEntityPersister.java:712)
   at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:329)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1341)
   at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
   at myco.dor.online.interlock.service.ejb.HibernateFactory.initSessionFactory(HibernateFactory.java:33)
   at myco.dor.online.interlock.service.ejb.HibernateFactory.getSessionFactory(HibernateFactory.java:23)
   at myco.dor.online.interlock.service.reports.utils.DBUtils.<init>(DBUtils.java:45)
   at myco.dor.online.interlock.service.reports.utils.DBUtils.getInstance(DBUtils.java:49)
   at myco.dor.online.interlock.service.reports.FinancialAssistanceReport.getReportData(FinancialAssistanceReport.java:24)
   at myco.dor.online.interlock.service.reports.AbstractReport.generateHTMLReportToStream(AbstractReport.java:192)
   at myco.dor.online.interlock.service.ejb.ReportsServiceBean.getFinancialAssistanceReport(ReportsServiceBean.java:69)
   at myco.dor.online.interlock.service.ejb.ReportsServiceBean$$FastClassByCGLIB$$4d0b53c6.invoke(<generated>)
   at net.sf.cglib.reflect.FastMethod.invoke(FastMethod.java:53)
   at org.mockejb.interceptor.InterceptorInvoker$CglibMethodInvoker.intercept(InterceptorInvoker.java:95)
   at org.mockejb.interceptor.InvocationContext.proceed(InvocationContext.java:177)
   at org.mockejb.interceptor.InterceptorInvoker.invoke(InterceptorInvoker.java:53)
   at org.mockejb.MockEjbObject.invoke(MockEjbObject.java:147)
   at $Proxy2.getFinancialAssistanceReport(Unknown Source)
   at myco.dor.online.interlock.test.ejb.ReportsTest.testFinancialAssistanceReport(ReportsTest.java:27)
   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:585)
   at junit.framework.TestCase.runTest(TestCase.java:164)
   at junit.framework.TestCase.runBare(TestCase.java:130)
   at junit.framework.TestResult$1.protect(TestResult.java:106)
   at junit.framework.TestResult.runProtected(TestResult.java:124)
   at junit.framework.TestResult.run(TestResult.java:109)
   at junit.framework.TestCase.run(TestCase.java:120)
   at junit.framework.TestSuite.runTest(TestSuite.java:230)
   at junit.framework.TestSuite.run(TestSuite.java:225)
   at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:297)
   at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.executeInVM(JUnitTask.java:1072)
   at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.execute(JUnitTask.java:682)
   at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.executeOrQueue(JUnitTask.java:1434)
   at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.execute(JUnitTask.java:632)
   at org.apache.tools.ant.Task.perform(Task.java:364)
   at org.apache.commons.jelly.tags.ant.AntTag.doTag(AntTag.java:195)
   at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:250)
   at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
   at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
   at org.apache.commons.jelly.tags.core.OtherwiseTag.doTag(OtherwiseTag.java:41)
   at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:250)
   at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
   at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
   at org.apache.commons.jelly.tags.core.ChooseTag.doTag(ChooseTag.java:38)
   at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:250)
   at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
   at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
   at org.apache.commons.jelly.tags.core.IfTag.doTag(IfTag.java:42)
   at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:250)
   at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
   at org.apache.maven.jelly.tags.werkz.MavenGoalTag.runBodyTag(MavenGoalTag.java:83)
   at org.apache.maven.jelly.tags.werkz.MavenGoalTag$MavenGoalAction.performAction(MavenGoalTag.java:116)
   at org.apache.maven.werkz.Goal.fire(Goal.java:691)
   at org.apache.maven.werkz.Goal.attain(Goal.java:623)
   at org.apache.maven.plugin.PluginManager.attainGoals(PluginManager.java:712)
   at org.apache.maven.MavenSession.attainGoals(MavenSession.java:265)
   at org.apache.maven.cli.App.doMain(App.java:307)
   at org.apache.maven.cli.App.main(App.java:217)
   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:585)
   at com.werken.forehead.Forehead.run(Forehead.java:551)
   at com.werken.forehead.Forehead.main(Forehead.java:581)
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Cameron McKenzie
 Post subject: Re: org.hibernate.loader.MultipleBagFetchException: cannot simul
PostPosted: Tue Jan 19, 2010 9:55 pm 
Expert
Expert

Joined: Tue May 13, 2008 3:42 pm
Posts: 919
Location: Toronto & Ajax Ontario www.hibernatemadeeasy.com
This happens when you've got multiple associations with an eagar load. I think it's multiple classes eagarly loading another, or something like that. Change some associations to lazy, and see what happens.

_________________
Cameron McKenzie - Author of "Hibernate Made Easy" and "What is WebSphere?"
http://www.TheBookOnHibernate.com Check out my 'easy to follow' Hibernate & JPA Tutorials

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orbfish
 Post subject: Re: org.hibernate.loader.MultipleBagFetchException: cannot simul
PostPosted: Thu Feb 10, 2011 4:47 pm 
Newbie

Joined: Fri Feb 04, 2011 9:49 pm
Posts: 11
I've got the same problem. I can't change from Lists because I'm not the one defining the objects. And I can't switch to LAZY because this is an RPC-type application where we always need to fetch right away. Frustrated....
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