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https://issues.jboss.org/browse/SEAMPERSIST-67?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647273#comment-12647273
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Jason Porter commented on SEAMPERSIST-67:
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The problem is a JSF problem. In your selectManyCheckBox you need to set the
collectionType attribute to the java.util collection type. Mojarra creates a
new instance of type to set the new values to. Either this is a new instance of
the type given in collectionType or the *concrete type* of the actual
collection. In this case it was the Hibernate PersistentBag. So Mojarra creates
a new instance of the class and sets the objects on that. Of course Hibernate
can't use that instance to persist with because it doesn't know anything about
it, it was created outside of Hibernate.
That's the core of the issue. When you fix that you also have to set the
objects on both sides of the many to many collection. In the github app you
posted you have to set the post on the tag(s) as well as the tag(s) on the
post. Then see things persisting correctly.
I also found another bug while going through this: SEAMFACES-224
> 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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