[seam-issues] [JBoss JIRA] (SEAMPERSIST-67) LazyInitializationException threw when persist a Many to Many collection of an entity.

Jason Porter (Commented) (JIRA) jira-events at lists.jboss.org
Wed Dec 7 19:05:41 EST 2011

    [ https://issues.jboss.org/browse/SEAMPERSIST-67?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649034#comment-12649034 ] 

Jason Porter commented on SEAMPERSIST-67:

Hantsy, what you have in the example is a bi-directional Many to Many. The only way to correctly save a bi-directional Many to Many. In that case you *must* set both sides of the relationship to maintain consistency and avoid corruption. If this were changed to a unidirectional Many to Many it would work the way you are expecting. This is all plain JPA, Seam isn't changing any of these

Here are a couple of links to help
* http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html/tutorial.html#tutorial-associations-usingbidir
* http://en.wikibooks.org/wiki/Java_Persistence/ManyToMany
> LazyInitializationException threw when persist a Many to Many collection of an entity.
> --------------------------------------------------------------------------------------
>                 Key: SEAMPERSIST-67
>                 URL: https://issues.jboss.org/browse/SEAMPERSIST-67
>             Project: Seam Persistence
>          Issue Type: Bug
>         Environment: Java 6 update 27, Seam 3.1.0Beta2, JBoss 7.0.1.Final
>            Reporter: hantsy bai
>            Priority: Critical
> I tried a saved a many to many relation(multicheckbox), but failed.
> But in before seam 2 application, I used like this, never encounter such a problem.
> I used Seam managed Persistence, and added TransactionIntercepter in the beans.xml.
> Please refer the discussion in the forum.

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