jsp - How to make the page load an error page after the tomcat session timeout? -

i need provide user error page after tomcat session time out. handle created filter , added logic detect , after saying go error page.

public void dofilter(servletrequest arg0, servletresponse arg1,         filterchain chain) throws ioexception, servletexception {     m_log.debug("startfilter");     httpservletrequest request=(httpservletrequest)arg0;     httpservletresponse response=(httpservletresponse)arg1;     string title = request.getparameter("context_title");     tcsessiondata tcsession = (tcsessiondata) request.getsession.getattribute("tcsessiondata");     if((title!=null && tcsession==null) || (title==null && tcsession!=null) ){         chain.dofilter(request, response);     }else if(title==null && tcsession==null) {         //response.sendredirect("/error/error.jsp");         request.getrequestdispatcher("/error/error.jsp").forward(request, response);     }   } 

after session times out see going right "if" logic , not forwarding/redirecting error.jsp. giving 404 error. tried both redirect , forward of page no success.i tired both absolute , relative path error.jsp page still see 404 error saying can't find error.jsp page. tried put error.jsp various location under webapps directory still no luck

my application has 1 page called root.jsp. when session time out application root.jsp , after timeout wrote go error.jsp.

here web.xml

<filter>         <filter-name>checksessionexpirationfilter</filter-name>         <filter-class>lti.google.checksessionexpirationfilter</filter-class>  </filter>  <filter-mapping>         <filter-name>checksessionexpirationfilter</filter-name>         <servlet-name>googledrivelti</servlet-name>  </filter-mapping>   <servlet>     <servlet-name>googledrivelti</servlet-name>     <servlet-class>lti.google.googleltiservlet</servlet-class>     <load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>     <servlet-name>googledrivelti</servlet-name>     <url-pattern>/service/*</url-pattern>  </servlet-mapping>   <session-config>     <session-timeout>1</session-timeout> <!-- in minutes -->   </session-config> 

here folder structure

localhost:8080/error/error.jsp 

here can see context name not present in url.

try (removing '/')

 getservletcontext().getrequestdispatcher("/error/error.jsp").forward(request, response); 

or

getservletcontext().getrequestdispatcher("error/error.jsp").forward(request, response);