How to make a login method for SAP Netweaver in java

Hi
Can anyone help me out to make a login() method that can be used to login to the SAP Netweaver server using a simple java code..........
Hope a helpfull answers from u all....
THANKS in ADV.
Rupesh Khemka

Hi Everyone
I have made the login() method but i am facing the problem while making the resource context...Because in Resource Context it takes IUser of package
com.sapportals.portal.security.usermanagement.IUser but I have got IUser of package com.sap.security.api.IUser ...while type Casting it with below code it is giving ClassCAstException.......
public class NewSimpleServlet extends HttpServlet {
     protected void doGet(
          HttpServletRequest request,
          HttpServletResponse response)
          throws ServletException, IOException {
          StringBuffer s = new StringBuffer();
          try {String j_user="epuser";
                    String j_password="Abcd1234";
                    request.setAttribute("j_user", j_user);
                    request.setAttribute("j_password", j_password);
                    javax.security.auth.Subject subject;
Set principals = UMFactory.getLogonAuthenticator().logon(request, response, "uidpwdlogon").getPrincipals();
i have problem with getting IUser object from set of principals. In javadoc is written: "In order to get an IUser object from this subject, call Subject.getPrincipals() and iterate through the returned Set of principals." so i tried to iterate but i was not able to get that IUser with any casting. Do u know how it should be?
IUser serviceUser = (IUser)subject.getPrincipals().iterator().next();
Now in resource Context
ResourceContext c = new ResourceContext(User);
Here resource context need IUser type object as parameter...
I also tried st like this
loggedUser = UMFactory.getAuthenticator().getLoggedInUser(request, response);
but loggedUser is not authenticated.
Can Anyone Help me Out...
Thanks
Rupesh Khemka

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