How to refresh using filter

I would like to use the filter to do a refresh on the page so that if
the system is idle for a period of time he returns to login screen, I
wonder how I can do this, I tried to use the jsni:

public class Filtro implements Filter {
public void destroy() {

}

public void doFilter(ServletRequest request, ServletResponse reponse,
FilterChain chain) throws IOException, ServletException {
if((Integer)((HttpServletRequest)request).getSession().getAttribute("code")
== null) {
reload();
}
chain.doFilter(request, reponse);
}

public void init(FilterConfig config) throws ServletException {

}

public static native void reload() /*-{
$wnd.location.reload();
}-*/;
}

If someone knows any other solution is welcome.

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