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

[Emmanuel Bernard (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/EJB-409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=32150#action_32150 ] 

Emmanuel Bernard commented on EJB-409:
--------------------------------------

Right removing the PERSIST from the cascading is I think the best approach if you want to stick with minimal DB hits. A bit annoying as it requires manual persist cascading but that's probably a fair price.

As Hardy pointed out, it is still worth investigate the diff between core and EM semantics.

> 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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