How to access Sap portal login user in ejb web service

Hi,
I wnt to access SAP Portal login user in my ejb application which resides on the same server.
I am using following code
try {
     IUser user =null;                         IWDClientUser wdUser = WDClientUser.getCurrentUser();
                              user = wdUser.getSAPUser();
                         } catch (WDUMException e) {
                              // TODO Auto-generated catch block
                              e.printStackTrace();
Some additional jar files are required for this?
The same code works fine with webDynpro but not with ejb.
Thanks in advance
Best regards,
Nilesh

Thanks for reply.
I have already added com.sap.security.api in my EJB module project classpath. How to add the same in EJB application Project (application-j2ee-engine.xml)?
Best regards,
Nilesh

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