How can i configure the deployment descriptor?

I have a question as follows:

I use a SessionBean to invoke two EntityBean's methods,

and i want these two methods in one transaction context.

I mean i want them rollback or commit together.

for example :

Session bean method sessionTest(),invoke EntityBean methods test1()

and test2(),if test1() is Succeed and test2() is failed , i want

rollback these two methods together.

How can i configure the deployment descriptor?

[492 byte] By [heyanchun] at [2007-9-26 11:59:37]