Java Development Tools

Dear people:

I'm trying to make a struts based application that
chain-forwards a single request via two struts action classes.

when a user submits the form post, the first struts action receives the form, does some processings and forwards it to the next action.

however, just before it's forwarding the action,
it needs to change the DynaActionForm settings that it
received to another value:

((DynaActionForm)form).set("event","now_do_this");

and forward to the second action which will receive the
form and read the value which was set up by
the first action.

However, whenever I tried to do this, the second action
simply couldn't get the set up value from first action.

I've searched around couple of struts tutorial sites
and this should be working:
http://www.exadel.com/tutorial/struts/5.2/guess/strutstutorial-dynaform.html

So what I want to know is:
is JDeveloper's (oracle's) struts runtime not properly
functioning?
or, is it my mistake to misunderstand the struts?

Any comments are welcomed.