Importing packages to EJB

Question

Hi
We are developing an EJB to return current logged in portal user.
For that trying to import the following packages
com.sap.tc.webdynpro.services.sal.um.api.IWDClientUser;
com.sap.tc.webdynpro.services.sal.um.api.WDClientUser;
com.sap.tc.webdynpro.services.sal.um.api.WDUMException;
com.sap.tc.webdynpro.services.session.api.IWDWindow;
Firstly, is it possible.
If yes, we are unable to import them, they do not appear in the plugins list.
However the same package has been imported in another DC, so is available in the eclipse.
Please suggest how to add them.

Answer 1

I had written this piece of code
public String userclass1() {
        // TODO Auto-generated constructor stub
         String user = sc.getCallerPrincipal().getName();
        return ("Hi" + user);
public SessionContext sc;
    public void setSessionContext( SessionContext context ) {
         this.sc = context;
    public SessionContext getSessionContext(){
         return this.sc;
But when the userclass1 is exposed as a webservice and consumed in another app, it throws a null pointer excpetion.
process()
[EXCEPTION]
com.sap.engine.interfaces.webservices.runtime.RuntimeProcessException: javax.ejb.EJBException: ASJ.ejb.005044 (Failed in component: sap.com/project1forejbEAR) Exception raised from invocation of public java.lang.String demo.sap.com.userclass1.userclass1() method on bean instance demo.sap.com.userclass1@4c1d064c for bean sap.com/project1forejbEARannotation|project1forejb.jarannotation|userclass1 in application sap.com/project1forejbEAR.; nested exception is: java.lang.NullPointerException: while trying to invoke the method javax.ejb.SessionContext.getCallerPrincipal() of an object loaded from field demo.sap.com.userclass1.sc of an object loaded from local variable 'this'