Java EE (Java Enterprise Edition) General Discussion

Hi all,
I have an application developed using ADF and jDeveloper.
My new use case is making a report of a view object that contains my .jspx page.
I've been reading and learning about jasper reports and ireports, i 've done some examples, I have created a report in ireports and called it from a .jspx page.
Now i have a question.
How can I pass a viewObject to the report? it would be easy if the VO consist on a simple SQL query.I would create the report with jdbc connection and go on. But this one has a bind variable that is changed by the user.

ej:

SELECT username
FROM Workers
Where Workers.cod:=CodParam

Any idea or interesting reading about this issue is welcome.

Thanks in advance,

Ainara