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

[Anthony Patricio (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/EJB-409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=32143#action_32143 ] 

Anthony Patricio commented on EJB-409:
--------------------------------------

Markus,
"we do not call persist on X, but update"
we all (you, hardy, and me) know one should stick with using JPA APIs and, in this case, em.merge.
About falling back to hibernate session and use of session.update, this is a hack you are using to avoid an extra select caused by an unrecommended default lazy configuration.





> 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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