code: @Override
      public Subject createHashtableInSubject(String username, @Sensitive String password) throws AuthenticationException {
          UsernamePasswordCredential credential = new UsernamePasswordCredential(username, password);
          return createHashtableInSubject(credential);
      }
docs: Returns the partial subject for hashtable login
  
  @param username
  @param password
  
  @return the partial subject which can be used for hashtable login if username and password are valid.
  @throws com.ibm.ws.security.authentication.AuthenticationException