[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2751) MappedSuperclass + M:N relation + PostUpdateListener = AssertionFailure: collection [xyz] was not processed by flush()

[S.Schnabl (JIRA)]

MappedSuperclass + M:N relation + PostUpdateListener = AssertionFailure: collection [xyz] was not processed by flush()
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                 Key: HHH-2751
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2751
             Project: Hibernate3
          Issue Type: Bug
    Affects Versions: 3.2.4.sp1, 3.2.4, 3.2.3, 3.2.2, 3.2.1
         Environment: Windows-XP, Jboss 4.2 GA, Hibernate 3.2.1GA, EJB3
            Reporter: S.Schnabl
         Attachments: Hibernate-TestCase.rar

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.

Explanation:
I have  two entities A.class and B.class defined, both inheriting from an common (empty) abstract MappedSuperclass. A and B having a m:n relation between each other. Furthermore there is an PostUpdateListener, which iterates through all properties of updated entities.

Testcase:
Both entities are linked with each (m:n), now i do an update of a simple property of entity A --> MyPostUpdateListener will be called, which iterates through each property of the updated entity(ies). In case of this property was a collection (= property of the m:n relation), the listener  furthermore iterates through this collection and get the id of each object in  the collection. Doing so will raise following exception :

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


Summarized these error will only occur, in case we are inherating from a mappedSuperClass, having a m:n relation  and having the listener touching the collection-elements. But these scenario isn'n very uncommon. We are using hibernate-event listener system for auditing-purposes, so you should understand that touching ever (element in the) collectin is necessary for audit-purposes.

Seems for me like a bug. Need this fixed asap ...

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