Application Integration

Hi All,

I am involved in the development of a web-based application that has the
following architecture.

JSP to deliver the presentation.
Single Servlet ( controller )
Session Beans and Entity Beans.

We use HttpSession object for user session tracking.
Scenario:
The UI of the application consists of frame pages - menu and content.
In the application the user clicks a link that points to an external web
application. We supply parameters in the request to the external application
for authentication. The content frame now displays a web page from the
external application.
The user now clicks a button in the web page of the external application and
gets routed back to our application. The external application passes some
information back to our application.
Problem:
My problem is how do I restart the user session. When I do a
request.getSession(false) it automatically returns a null. How can I
preserve the user session with context to the requests coming from the
content frame.

Any help is welcome.

Regards
Rohit

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