Calling j2ee web service with portal user

Hello,
I created web service using Nwds Ejb.
I want to run this web service from sap portal iview and to receive the same user Id that logon to the portal , on the web service side.
In the j2ee Ejb code I am using :
try{
String username = myContext.getCallerPrincipal().getName();
IUser user =
UMFactory.getUserFactory().getUserByUniqueName(username);
return user.getUniqueName;
} catch(UMException e) {
return e.getMessage();
But the result is always Guest ?
even if I selected use sap authentication on the wsdl descriptor.
Need some help solving this issue?
Thanks in advance
Nir

Hi,
And Could we know how you manage this?
I'm also interested in resolving this kind of issue.
Edited by: Xavier Tendron on Oct 19, 2009 3:23 PM

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