code: public void login( String username, String password, HttpServletRequest request, HttpServletResponse response )
              throws LoginException
      {
          throw new UnsupportedOperationException( "login is not supported by "
                                                   + DefaultServletContainerAdapter.class.getName() );
      }
docs: Log in the user, using "weak" username/password authentication.  This default implementation always throws
  {@link UnsupportedOperationException}.
  
  @throws UnsupportedOperationException in all cases.