[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5280) "java.lang.IllegalArgumentException: object is not an instance of declaring class" when persisting a object graph containing the same transient objetc twice.

[Anton Marsden (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=38867#action_38867 ] 

Anton Marsden commented on HHH-5280:
------------------------------------

For those looking for a quick fix, this hack seems to do the trick.

In org.hibernate.engine.StatefulPersistenceContext.java:

from line 1267:
        // try cache lookup first
        Object parent = parentsByChild.get( childEntity );
        if ( parent != null )
        {
            boolean isFoundInParent = false;
            try
            {
                isFoundInParent = isFoundInParent( propertyName, childEntity, persister, collectionPersister, parent );
            }
            catch ( PropertyAccessException e )
            {
                // fall through
            }
            if ( isFoundInParent )
            {
                return getEntry( parent ).getId();
            }
            else
            {
                parentsByChild.remove( childEntity ); // remove wrong entry
            }
        }


> "java.lang.IllegalArgumentException: object is not an instance of declaring class" when persisting a object graph containing the same transient objetc twice.
> -------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-5280
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5280
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.5.2
>         Environment: Hibernate 3.5.2
> Db: All? (At least h2 and mysql)
>            Reporter: Benjamin Lerman
>            Priority: Critical
>         Attachments: hibernate-multi-parent.tgz, test.entity.TestCreate.txt
>
>
>  I attach a maven project showing the bug.
>  I have 3 classes, A, B, C with
>  C have a one-to-many unidirectional relation to B and A.
>  B have a one-to-many unidirectional relation to A.
>  Those relations are mapped by foreign keys.
>  The cascading properties for those relations are all save-update,persist
>  For each of those relations, the inverse cardinality is 1 (which means A must be associated with a B and a C, and B must be associated with a C).
>  I create an instance of C that I associate to an instance of B and an instance of A, and I associate the instance of B with the instance of A.
>  I then try to save C, and I get the attached exception.
>  For what I understood the problem is with the method StatefulPersistenceContext.getOwnerId: this method use a cache to retrieve the parent of the instance of A, but because A has 2 different parents (the instance of B and the instance of C), it does not retrieve the right one and try to call a method on the wrong entity.
>  

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