public long getCreationTime() {
   try {
     return session.getCreationTime();
   } catch (IllegalStateException e) {
     throw new SessionExpiredException(e);
   }
 }
 /** @see javax.servlet.http.HttpSession#getCreationTime() */
 @Override
 public long getCreationTime() {
   return portletSession.getCreationTime();
 }