¿Cómo aprender de qué IP se ha producido un inicio de sesión exitoso?

Question

Yo uso Spring Security 3. Tengo el método de Follewing:

public class CustomUsernamePasswordAuthenticationFilter extends UsernamePasswordAuthenticationFilter {
    @Override
    protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, Authentication authResult) throws IOException, ServletException {
        super.successfulAuthentication(request, response, authResult);
        UsernamePasswordAuthenticationToken token = (UsernamePasswordAuthenticationToken) authResult;
        WebAuthenticationDetails details = (WebAuthenticationDetails) token.getDetails();
        String address = details.getRemoteAddress();
        System.out.println("Successful Login from remote address: "+ address);
    }

    @Override
    protected void unsuccessfulAuthentication(HttpServletRequest request, HttpServletResponse response, AuthenticationException failed) throws IOException, ServletException {
        super.unsuccessfulAuthentication(request, response, failed);
        System.out.println("==failed login==");
    }
}

¿Tengo un código sucio para unboxing variable de dirección? ¿Puedo escribirlo en breve o correctamente?