When transaction starts and finally ?

Hi, i have a questiom from container transaction.

If i have a

servlet-->businessdelegate-->sessionejb-->entitybean-->database

Who begin a transaction ? and when the same finally ?

/********* Servlet *********/...

call... businesDelagate.actions(XXX);

/********* BusinessDelegate *********/ ...

publicvoid actions(XXX){

call....

sessionFacade.insert(XXX);

sessionFacade.update(XXX);//only to explain obvious

}

/********* SessionFacade *********/

publicvoid insert(XXX){

JPA operations with entities...

}

publicvoid update(){

JPA operations with entities...

}

In this scenario what the behaviour expected using a container transaction.

Thanks!!

[1268 byte] By [Solraca] at [2007-11-27 9:55:24]