java - How to redirect a jsf page to home page if session does not exist -

am creating jsf application have embedded applet in main page. problem cant figure out how check if session exist before loading applet main page , if session not exist want redirect user home page

i recommend use filter:

public class loggedfilter implements filter {      @override     public void dofilter(servletrequest request, servletresponse response, filterchain chain) throws ioexception, servletexception {         httpservletrequest httpservletrequest = (httpservletrequest) request;         httpsession session = httpservletrequest.getsession(false);         if (session == null) {             httpservletresponse httpservletresponse = (httpservletresponse) response;             httpservletresponse.sendredirect(httpservletresponse.encoderedirecturl(httpservletrequest.getcontextpath() + "/"));         } else {             chain.dofilter(request, response);         }     } 

and of course map filter jsf pages in web.xml:

<filter>   <filter-name>loggedfilter</filter-name>   <filter-class>loggedfilter</filter-class> </filter>  <filter-mapping>   <filter-name>loggedfilter</filter-name>   <url-pattern>*.xhtml</url-pattern> </filter-mapping> 

(i assume jsf pages have suffix xhtml)