Filter not working for session timeout

Question

Hi all,
I am working on a struts application in portal. I want to logout of the application when a user does not perform any action, for say 30 mins. For this, i am using a filter and defined the filter as follows in web.xml.
<filter>
<filter-name>PageFilter</filter-name>
<filter-class>SessionFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>PageFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
Also i gave the timeout in web.xml as follows.
<session-config>
<session-timeout>30</session-timeout>
</session-config>
And i had the filter servlet as follows.
public class SessionTimeoutFilter implements Filter
public SessionFilter()
public void init(FilterConfig conf) throws ServletException {
public void destroy()
// Create a new instance of SessionFilter
private static int firstRequest = 0;
public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain)
throws IOException,ServletException
HttpServletRequest hreq = (HttpServletRequest)request;
HttpServletResponse hres = (HttpServletResponse)response;
HttpSession session = hreq.getSession();
try{
if (session.isNew()) {
if(firstRequest == 0){
firstRequest++;
else {
hres.sendRedirect("http://www.google.com");
firstRequest = 0;
return;
}catch(Exception e){
e.printStackTrace();
chain.doFilter(request,response);
When trying to execute this one i am getting a portlet 500 internal error. I am not sure where i went wrong. Can anyone give me a suggestion for this to work in a portal.?
Thx in advance....

Answer 1

Hi,
Thx for ur reply, Here i am using firstRequest as a counter variable. when the session is new and firstRequest is 1, it means that the session has expired and new session started and this is where i am redirecting to another page. The problem is, i think is mainly because of the sendRedirect i am using there in the code. I think sendRedirect will not work in portal, because when i test this application locally , it is working fine. But when i deploy it in portal, i am getting the error. Can you suggest me an alternative for sendredirect in portal.Even i tried with forward but no use.
Thx....