[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.

[Guillaume Mary (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=39026#action_39026 ] 

Guillaume Mary commented on HHH-5280:
-------------------------------------

I have almost the same problem, the exception is the same and the use case is very similar: I could reproduce it with 2 parents, each owning a List of the same typed children.
My Hibernate version is *3.6.0.Final*.

I attached a maven project with a junit test.

> "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, projectHbBugParentId.zip, 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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