[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2980) Error "org.hibernate.HibernateException: cannot simultaneously fetch multiple bags" not specific enough

[Antoine Herzog (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_30255 ] 

Antoine Herzog commented on HHH-2980:
-------------------------------------

Hi,

it is true that the message is quite the minimum.
and it is true that, when there is some help (such as : "you should put insertable=true, updatable=true..." or so...) it is great. Really great.

well, anyway, for people who come to this Jira : here is a forum post that is very interesting about this issue.

http://www.jboss.com/index.html?module=bb&op=viewtopic&t=82946

There is both some (more) explaination of the problem, and some nice workaround ways.
As Emmanuel says, it is not that simple... but there the explaination is nice... and the workaround seems to be good in most of the case.

Hope it helps,




> Error "org.hibernate.HibernateException: cannot simultaneously fetch multiple bags" not specific enough
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-2980
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2980
>             Project: Hibernate3
>          Issue Type: Improvement
>    Affects Versions: 3.2.5
>            Reporter: Dobes Vandermeer
>            Priority: Minor
>
> When I get this exception:
> org.hibernate.HibernateException: cannot simultaneously fetch multiple bags
> I don't know what to do except google.  Why not spruce it up a little to say something like:
> For class X, multiple collection fields are marked for eager fetching: a, b, c; this is not supported by Hibernate in releases after 3.2.x

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