[jboss-user] [JBoss Seam] - Re: Basic Seam questions

[lightbulb432]

Some questions below:

1) Could somebody describe the difference between the Seam-Managed Persistence Context that I've been reading about and the regular persistence contexts (Transaction and Extended)? Which one is it more similar to, and what should a Seam user know about it?

2) If you have an entity whose fields you populate over several steps in a conversation, business process, or just a session, would you need to avoid validation annotations like @NotNull?

I tried it and, after the first step in the multi-step process, it expectedly says that you're violating a null condition (because you've entered only a few fields and not all). Is there any way to get around this, short of moving everything to a single page or getting rid of annotations...or is this just a downside of such multi-step processes?

3) If you have an existing entity that is detached, what's the difference between calling EntityManager.persist and EntityManager.merge? Is persist simply not meant to be used in such a case (though couldn't it find the current existing row in the database using the primary key of the Java entity and update that row based on changes)?

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