Passing parameter from JSPDynpage to Webdynpro

Question

Hi,
I am trying to get parameter in webdynpro application from JSPdynpage and i have pasted my code snippet.
JSPDynpage Code:
EPCM.doNavigate('My Targett URL');
IPortalComponentRequest request = (IPortalComponentRequest) this.getRequest();
request.getServletRequest().getSession().setAttribute("PNUMBER", "10001");
In webdynpro:
HttpServletRequest request = ((IWebContextAdapter) WDWebContextAdapter.getWebContextAdapter()).getHttpServletRequest();     
HttpSession session = request.getSession();
pNumber = (String)session.getAttribute("PNUMBER");
From JSPDynpage it navigating to webdynpro application but getparameter() always null.
I cross checked both JSPdynpage and webdynpro session getId() both are returning same id but parameter is not passing.
where i am doing wrong?
thanks in advance,
regards,
SKB

Answer 1

Hi SKB,
The problem is that portal applications and Web Dynpro applications have different sessions (even if they have the same session ID). All portal applications are technically one J2EE application (called "sap.com/irj") and all Web Dynpro applications are technically one J2EE application (called "sap.com/tcwddispwda"). The reason why sessions must be different, is because of the J2EE specs. Below is an extract from the Java Servlet Specification 2.4.
<u>SRV.7.3 Session Scope</u>
<i>HttpSession objects must be scoped at the application (or servlet context) level.
The underlying mechanism, such as the cookie used to establish the session, can be the same for different contexts, but the object referenced, including the attributes in that object, must never be shared between contexts by the container.
To illustrate this requirement with an example: if a servlet uses the RequestDispatcher to call a servlet in another Web application, any sessions created for and visible to the servlet being called must be different from those visible to the calling servlet.</i>
The solution to your problem is not to use session attributes, but URL parameters. In your JSPDynpage use something like this
EPCM.doNavigate('ROLES://portal_content/foo&DynamicParameter=PNUMBER%3D10001');
And in your Web Dynpro application use something like this
String pNumber = WDWebContextAdapter.getWebContextAdapter().getRequestParameter("PNUMBER");
Kind regards,
Sigiswald