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

[<leg...@at...>]

The following comment has been added to this issue:

     Author: Gavin King
    Created: Thu, 28 Aug 2003 2:44 PM
       Body:
whoa! Thats bad....


But I'm looking at the code and I just don't see how it could occur!

Can you please submit a main() method to reproduce this? It doesn't occur in tests and the code certainly LOOKS correct. I'm stumped!


p.s. I suppose you are _absolutely_ certain you aren't hitting the session from multiple threads....
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  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: Unassigned
   Priority: Major

    Project: Hibernate2
 Components: 
             core
   Versions:
             2.1

   Assignee: 
   Reporter: Mathias Bogaert

    Created: Thu, 28 Aug 2003 6:49 AM
    Updated: Thu, 28 Aug 2003 6:49 AM
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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