[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2862) Collection is not associated with any session exception when doing an eager fetch on a non-unique collection.

[Paul Andrews (JIRA)]

Collection is not associated with any session exception when doing an eager fetch on a non-unique collection.
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                 Key: HHH-2862
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2862
             Project: Hibernate3
          Issue Type: Bug
         Environment: Hibernate 3.1.3 - Hibernate 3.2.5, HSQLDB, Java5
            Reporter: Paul Andrews


It is basically caused by having an eager collection where the key of the collection is not unique in the results.

The code works as follows in CollectionType.getCollection():

                                ....
				persistenceContext.addUninitializedCollection( persister, collection, key );
	
				// some collections are not lazy:
				if ( initializeImmediately( entityMode ) ) {
					session.initializeCollection( collection, false );
				}
				else if ( !persister.isLazy() ) {
					persistenceContext.addNonLazyCollection( collection );
				}
	
				if ( hasHolder( entityMode ) ) {
					session.getPersistenceContext().addCollectionHolder( collection );
				}

if persistenceContext.addUninitializedCollection() detects that the collection with the given key has already been added it clears the session on the old instance of the collection (sets it to null). However, that collection has already been added to the persistence context by an earlier call to this method. So later when StatefulPersistenceContext.initializeNonLazyCollections() is called it iterates through all of the collections in the persistence context (including those which have had their session set to null by addUninitializedCollection()), calling forceInitialization() which throws a 'collection is not associated with any session' exception.


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