[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2763) (lazy) m:n relation + EventListener = AssertionFailure: collection [n-side] was not processed by flush()

[Martin Backhaus (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_30326 ] 

Martin Backhaus commented on HHH-2763:
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This problem i got too. My conclusion was, that you have not to change the state of the current object in the current session within events.
But if you want only use changed attributes - use the findDirty() (ore something called like this) to touch only changed (and loaded) attributes.
Iterate over dirty fields within the same session works fine for me. But i have to read in some cases all data -> i used another session.

If you would like to use another session, you should do the work within onPreUpdate() (not post), to fetch old data.

> (lazy) m:n relation + EventListener = AssertionFailure: collection [n-side] was not processed by flush()
> --------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-2763
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2763
>             Project: Hibernate3
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.2.4.sp1, 3.2.5
>         Environment: Windows-XP, Jboss 4.2.1GA, Hibernate 3.2.4SP1, EJB3
>            Reporter: S.Schnabl
>            Priority: Critical
>         Attachments: bidirectional_many-to-many.gif, cdel_analyse.txt, HHH-2763_standalone_testcases.zip, one-to-many_with_many_side_having_collections.gif, Testcase.zip
>
>
> For more details see the attached testcase. I'm sorry, but in the short of time i only got a testcase for jboss-server 4.2. Please deploy the server.ear from /release-directory and then call the /src/client/TestCaseClient.java.
> [Summarized]
> It seems, that touching a lazy (Persistent-)Collection of at least a m:n relation inside a Hibernate event-listener always raises this error:
> org.hibernate.AssertionFailure: collection [n-side] was not processed by flush()
> [Explanation]
> I have two entities A. and B. Both having a m:n relation between each other. Furthermore there is an PostUpdateListener, which iterates onUpdate of entitiy through all properties of updated entity.
> [Testcase]
> Both entities are linked with eachother (m:n). If i  now do a simple update of a property of entity A --> MyPostUpdateListener will be called, which iterates through every property of the updated entity. In case of this property was a collection (= lazy PersistentCollection of m:n relation), hibernate initializes the collection for further work. I can now run through all objects of the collection, but after all work is done in listener, I get the following exception from postFlush:
> Caused by: org.hibernate.AssertionFailure: collection [com.qualitype.testcase.server.ejb.entity.EntityB.entitiesOfA] was not processed by flush()
> at org.hibernate.engine.CollectionEntry.postFlush(CollectionEntry.java:205)
> at org.hibernate.event.def.AbstractFlushingEventListener.postFlush(AbstractFlushingEventListener.java:333)
> at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:28)
> at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
> at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
> at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:515)
> ... 29 more
> Attention: EntityB.entitiesOfA is the other-side  collection of the m:n relation of the updated EntityA.
> We are using hibernate-event listener system for auditing-purposes, so you should understand that touching every (element in the) collection is necessary for audit-purposes.
> Seems for me like a serious bug. Need this fixed asap ...

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