[hibernate-issues] [Hibernate-JIRA] Commented: (EJB-409) EAGER fetched collection + Cascade.PERSIST generates broken behavior on session.update

[Markus Merder (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/EJB-409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=32155#action_32155 ] 

Markus Merder commented on EJB-409:
-----------------------------------

Well, if you use @GeneratedValue to set the id, hibernate can determine if an entity is newly created or just detached. Why is the persist-operation cascaded to detached objects even if it is known that they are detached (you will get a "PersistentObjectException: detached entity passed to persist", when using @GeneratedValue). Don't you think this could be improved? I think this solution (only persisting new objects on flush) would still be according the specs, wouldn't it?

> EAGER fetched collection + Cascade.PERSIST generates broken behavior on session.update
> --------------------------------------------------------------------------------------
>
>                 Key: EJB-409
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/EJB-409
>             Project: Hibernate Entity Manager
>          Issue Type: Bug
>    Affects Versions: 3.2.1
>            Reporter: Anthony Patricio
>         Attachments: HBCoreTestCase.zip, HEMTestCase.zip
>
>
> I didn't really know where to log this extremely weird bug.
> Customer 1--* Contact
> Bidirectional.
> Collection annotated with 
>     @OneToMany(fetch=FetchType.EAGER, mappedBy="customer")
>     @Cascade({CascadeType.PERSIST})
> Step 1: load a Customer (contacts are transparently retrieved) and detach the graph.
> Step 2: re attach using session.update
> --> session tries to insert into CONTACT table
> Weird things: 
> - works with @OneToMany(fetch=FetchType.LAZY, mappedBy="customer")
> - works if CascadeType.PERSIST is removed
> - works with 100% plain hibernate (mapping files + session APIs (via session Factory, see test based on hb core template)
> - fails with 50% plain hibernate (mapping files + EM APIs to obtain HB session)
> - I also tried to use HEM + hb plain mapping files --> this is failing, that's why I raised the issue in HEM project.
> I'm attaching 2 testcases: one using HEM test template (failing test) and one using HB Core template (passing test).
> This use case is not so exotic and the problem may hide something more critical.

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