2)the opened page by parent calling window.open
That is why the parameter is not there.
If the request parameter is not submitted in the request, how can it be accessed in the
JSP?
To solve this problem, submit the form to a new window.
1) use target="_blank" on the form. (easy)
2) use xhr to submit the form, then open a window with the response (complicated).
For a prototype, you could choose option 1.
For a real world scenario, you might choose option 2 and use a panel widget instead of a window.
HTH.
Garrett