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Remove() question

Keith Rosenfield
Ranch Hand

Joined: Nov 25, 2003
Posts: 277
Hello everyone:
On page 79 of the spec it says
An attempt to remove a
session object while the object is in a transaction will cause the container to throw the
javax.ejb.RemoveException to the client.

I was trying to come up with a scenario where a session object using CMP could be in a trasaction when remove was called but could not. My understanding is that all business methods that run in a transaction context will complete their transaction before returning and therefore when remove is called the object will no longer be in a transcation. Since this statement is in the spec, I assume that it is possible for the object to be in a transaction when remove is called. Can anyone please describe a scenario where this is the case.
Thanks,


Keith Rosenfield<br />SCJP<br />SCWCD<br />SCBCD
Tulsi Rai
Ranch Hand

Joined: Jun 26, 2002
Posts: 55
Hei Keith,
As far as i understand, Let's say client A is invoking a getAdviceFrom()method in AdviceBean with transaction, if client B tries to remove the AdviceBean, then container throws RemoveException. The invoked method must return before the AdviceBean can be removed.
Anybody has any explanation,please?
Keith Rosenfield
Ranch Hand

Joined: Nov 25, 2003
Posts: 277
Hi Tulsi:
I don't understand. How does client B even get a hold of the bean since it should be exclusive to one client? Even if does, I thought that the container would serialize calls to the bean, therefore it will not call remove() until getAdviceFrom() is complete. I am not sure what the source of my confusion is. Am I making an assumtion that is incorrect?
Please help me clear up my confusion.
Thanks,
Philippe Maquet
Bartender

Joined: Jun 02, 2003
Posts: 1872
Hi Keith,
I guess it only applies to stateful session beans with BMT, where a transaction may span multiple methods.
All best,
Phil.
Keith Rosenfield
Ranch Hand

Joined: Nov 25, 2003
Posts: 277
Hi Phillipe:
That makes sense.
Thanks,
 
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subject: Remove() question