SOAP --XI ---RFC or Java Client  Proxy

Hello Gurus,
Need your adivce for a scenario in XI
Scenario ---  To implement XI with SAP SCEM(Supply Chain Event Management).
Client is sending data from Web Portal (JSP Page) and wants to integrate with R/3.
(Request from client and Response from R/3 shown again at browser )
Web Portal (JSP Page) is on server A and XI on server B
Queries ---
1. Can I use Java Client Proxy Approach ---  proxy --- xi -- rfc approach 
If  Web Portal (JSP page) is working in server A and XI in server B then can I call xi server from jsp page by passing xi server credential (username,password,bus service) and using sync Interface I can show result back to browser.
2. For SOAP Approach  -- SOAP -- XI --- RFC approach 
Suppose I need to send two parameters from my Web Portal (JSP page) to xi to R/3 and it will return some result.
Concept of Webservice --- any application (like BAPI ) exposed.
a. Pls tell me all the steps required for IR and ID
b.How can I invoke that generated webservice from my jsp page --- so that my request parameters values go to xi from my jsp page and to R/3 and then result from R/3 to xi and to my jsp page.
Regards

I think second approach is more appropriate ie. SOAP>XI>RFC
Some of the blogs you can refer:
/people/riyaz.sayyad/blog/2006/05/07/consuming-xi-web-services-using-web-dynpro-150-part-i
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/d23cbe11-0d01-0010-5287-873a22024f79
Sender SOAP adapter config: http://help.sap.com/saphelp_nw04s/helpdata/en/fc/5ad93f130f9215e10000000a155106/content.htm
Hope this helps,
Rgds,
Moorthy

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    Regards,
    Vinod.

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