[Hibernate-issues] [Hibernate-JIRA] Commented: (HB-296) ConcurrentModificationException when initializing collection

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The following comment has been added to this issue:

     Author: Mathias Bogaert
    Created: Thu, 4 Sep 2003 6:32 AM
       Body:
After verifying it, I'm _certain_ I'm not accessing it from different threads. It has something to do with the object that is removed from the hashmap (and that is in the collection being initialized) already was loaded by the session before. I'll continue trying to reproduce in a testcase.
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View the issue:

  http://opensource.atlassian.com/projects/hibernate/secure/ViewIssue.jspa?key=HB-296


Here is an overview of the issue:
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        Key: HB-296
    Summary: ConcurrentModificationException when initializing collection
       Type: Bug

     Status: Assigned
   Priority: Major

    Project: Hibernate2
 Components: 
             core
   Versions:
             2.1

   Assignee: Gavin King
   Reporter: Mathias Bogaert

    Created: Thu, 28 Aug 2003 6:49 AM
    Updated: Thu, 28 Aug 2003 3:41 PM
Environment: 2.1 beta 2 from CVS

Description:
When initializing a collection, I get the following stacktrace (not seen with Hibernate 2.0.3):

8047 ERROR [tcpConnection-81-0] (webwork.dispatcher.ServletDispatcher:188) - Could not execute action
java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.remove(HashMap.java:801)
	at net.sf.hibernate.impl.SessionImpl.endLoadingCollections(SessionImpl.java:2973)
	at net.sf.hibernate.loader.Loader.doResultSet(Loader.java:224)
	at net.sf.hibernate.loader.Loader.doFind(Loader.java:113)
	at net.sf.hibernate.loader.Loader.loadCollection(Loader.java:720)
	at net.sf.hibernate.loader.Loader.loadCollection(Loader.java:703)
	at net.sf.hibernate.loader.OneToManyLoader.initialize(OneToManyLoader.java:74)
	at net.sf.hibernate.impl.SessionImpl.initialize(SessionImpl.java:3101)
	at net.sf.hibernate.collection.PersistentCollection.forceLoad(PersistentCollection.java:236)
	at net.sf.hibernate.Hibernate.initialize(Hibernate.java:255)
	at com.intrasoft.persistence.hibernate.HibernatePersistenceService.initialize(HibernatePersistenceService.java:143)
	at com.intrasoft.sysaudit.mission.action.wizard.AbstractMissionStepAction.initializeMission(AbstractMissionStepAction.java:112)
	at com.intrasoft.sysaudit.mission.action.wizard.AbstractMissionStepAction.saveMissionInSession(AbstractMissionStepAction.java:74)
	at com.intrasoft.sysaudit.mission.action.wizard.MissionStep1.doExecute(MissionStep1.java:173)
	at com.opensymphony.xwork.ActionSupport.execute(ActionSupport.java:31)

Here is my code:

if (mission.getUnit() != null) {
    persistenceService.initialize(mission.getUnit().getUsers());
}

and in HibernatePersistenceService:

public void initialize(Object objectToInitialize) {
    try {
        if (!Hibernate.isInitialized(objectToInitialize)) {
             Hibernate.initialize(objectToInitialize);
         }
    }
    catch (HibernateException e) {
        throw new InfrastructureException(e);
    }
}


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