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/**
 * @see http://java.zacheusz.eu/google-app-engine-http-session-vs-jsf-en/394/ 
 */
private void updateSession() {
		 ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder
				.currentRequestAttributes();
		HttpSession session = attr.getRequest().getSession();
		session.setAttribute("forceGaeSessionSerialization",
				System.currentTimeMillis());
	}