Calling an Abap Web Service from IBM WebSphere with a MYSAPSSO2 Cookie

Hello,
I have the following problem :
I have to develop a proof of concept between IBM Web Sphere 5.1 and SAP AS JAVA 7.0.
I have created an IBM sevlet in Web Sphere, I use a specific redirect from an SAP AS Java to call it, this way I can have a SAP Logon Ticket, and I manage to call an ABAP module function with JCO with SSO.
Scenario 1 : browser  + authentication --> AS Java redirect servlet MYSAPSSO2 cookie -> IBM WebSphere servlet JCO -> Abap module function (ECC5)
This scenario works fine.
I have to do the same scenario with a Web Service and I don't know what to do.
I try to use jax-rpc handlers but I don't know how to pass my cookie from my servlet to my handler.
Scenario 2 : browser + authentication --> AS Java redirect servlet MYSAPSSO2 cookie -> IBM WebSphere servlet JCO -> Abap Web Service (ECC5)
Has someone already done that  ?
Regards,  Julien.

Julien,
Why are you using 5.1....go for 6.0 and its cake walk, i have integrated WebSphere 6.0 with R/3 uysing xi.....in a week.
Scenario changed to:--
Browser+ authentication --> WebSphere AS servlet request --> XI --> RFC/bapi --> abap webService
Hope that helps
Regards
Ravi

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