Question about Seam dvd example and persistence

c_eric_ray Aug 11, 2006 11:36 AM

Why are some EM annotated with EXTENDED and some are not. It seems to me that you would choose an aproach and then use it consistently throughout the application. So the real question is, what does it buy you to have some EJBs that uses EXTENDED transactions and some that don't?

Thanks.
Eric Ray

1. Re: Question about Seam dvd example and persistence

pmuir Aug 12, 2006 8:18 AM (in response to c_eric_ray)

http://jboss.com/index.html?module=bb&op=viewtopic&t=88460
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2. Re: Question about Seam dvd example and persistence

c_eric_ray Aug 14, 2006 9:44 AM (in response to c_eric_ray)

I've read that post and while excellent in it's own right, it only explains the differences in the two. Being new to EJB and and CMP, it's still unclear as to why you would mix the two types of persistence management within one application. I don't understand the advantage of using EXTENDED in a bean and then TRANSACTION in the next bean and what design and architectural aspect feed the decision.

Thanks.
Eric Ray
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3. Re: Question about Seam dvd example and persistence

pmuir Aug 14, 2006 1:34 PM (in response to c_eric_ray)

Well if you are in a stateless area of your app you don't need an extended/SM persistence context so I suppose the designer choose not to use one. I use SMPC throughout my app so that the whole thing is simple. Anyone know why you shouldn't use a SMPC/Extended PC in a stateless bean? Performance?
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