is this a nested transaction problem? what is a nested transaction

[Denis Wang]

Hello, all,
I am using CMP for session facades and two local entity beans. Both entity beans and the session facade are put into CMP with transaction option of 'required' in ejb-jar.xml

In my SessionFacade.facade() method, I call EntityBean1.bean1() and then EntityBean2.bean2().  My intention is to roll back the facade() transaction if either bean method is failed.  However, I observe that, once bean1() is returned the database will be updated.  If there is an exception thrown from bean2(), no roll back happens.

This is totally against my assumption.  I am not sure whether it is caused by nested transaction not supported by EJB2.0 and weblogic currently.

I will appreciate it if any one can provide a definite answer.

 

Another related question is, which one of the followings is qualified as a 'nested transaction'?  My intention is to have a coarse update for my entity bean.

A) SessionFacade.facade(){ bean.setA(); bean.setB();}

B) EntityBean.updateBean(){ setA(); setB(); }

 

Answer 1: A) but not B) 

Answer 2: both A) and B).

 

Thanks,

Denis