Session restarting

<script>
var  disconnect = 0;
var inter = setInterval(function () {

   jq.ajax({
    type: "POST",
    url: "http://localhost:8080/myapp1/",
    success: function(response ){
    if(disconnect){
    clearInterval(inter);
    window.history.go(0);
     
    }
     
    },
    error: function()
    {
     disconnect = 1 ;
    }
   });
  }, 3000);
</script>

	<script type="text/javascript">
		var isChecking = false,
			disconnected = false,
			check;
		startCheck();
		function startCheck() {
			check = setInterval(function () {
				 // avoid multiple checking
				if (isChecking) return;
				isChecking = true;
				var check = disconnected? 'Connection' : 'Session';
				jq.ajax({
					type: "POST",
					url: "http://localhost:8080/SupportProj/check"+check+".zul",
					success: function(response ){
						isChecking = false;
						if (disconnected) {
							disconnected = false;
							window.history.go(0);
						}
					},
					error: function()
					{
						isChecking = false;
						disconnected = true;
					}
				});
			}, 1000);
		}
	</script>

package test;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;

public class ConfirmFilter implements Filter {

	private static Logger logger = Logger.getLogger(ConfirmFilter.class);

	public ConfirmFilter(){
		super();
	}

	public void init(FilterConfig filterConfig) throws ServletException {

	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest)request;
		HttpServletResponse resp = (HttpServletResponse)response;
		if(doValidate(req, resp)){ //-- response ok Session is validate
			resp.sendError(resp.SC_OK);
		}
		else{ // response error if session is not valid
			resp.sendError(resp.SC_FORBIDDEN);
		}
    }

	public void destroy(){

	}

	public boolean doValidate(HttpServletRequest req, HttpServletResponse resp ) throws IOException, ServletException {
		if(req.getRequestURI().endsWith("Connection.zul")) // checkConnection.zul just check whether connectable
			return true;
		return (req.isRequestedSessionIdValid());
	}

}

	<filter>
		<description>Checking connect session</description>
		<display-name>ConfirmFilter</display-name>
		<filter-name>ConfirmFilter</filter-name>
		<filter-class>test.ConfirmFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>ConfirmFilter</filter-name>
		<url-pattern>checkSession.zul</url-pattern>
	</filter-mapping>
	<filter-mapping>
		<filter-name>ConfirmFilter</filter-name>
		<url-pattern>checkConnection.zul</url-pattern>
	</filter-mapping>