java - Session Timeout does not work on Google App Engine -


i have simple jsp servlet web app deployed on google app engine. have sessionlistener implementing httpsessionlistener monitor creation , destroying of sessions.

public class sessionlistener implements httpsessionlistener {    private int sessioncount = 0;    @override   public void sessioncreated(httpsessionevent event) {     // todo auto-generated method stub     synchronized (this) {         sessioncount++;     }      system.out.println("session created: " + event.getsession().getid());     system.out.println("total sessions: " + sessioncount);   }    @override   public void sessiondestroyed(httpsessionevent event) {     // todo auto-generated method stub     synchronized (this) {         sessioncount--;     }     system.out.println("session destroyed: " + event.getsession().getid() + ", " + event.getsession().getattribute("loginname"));     system.out.println("total sessions: " + sessioncount);   }  }

in web.xml file have set following config allow automated session timeout after 30 minutes:

<session-config>     <session-timeout>30</session-timeout> </session-config>

in appengine-web.xml file have set following config:

<sessions-enabled>true</sessions-enabled>

when deployed , running locally sessions idle 30 minutes destroyed after 30 minutes see in console

"session destroyed: {sessionid} etc"

however when got app deployed on gae not find printout in log console of gae admin page idle session. session gets destroyed when explicitly hit logout button calls 

httpsession session=request.getsession(false); session.invalidate();

so think idle sessions never destroyed after specific set time. , notice total count of sessions kept increasing new browsers accessing web app.

i know gae deals session way: store sessions in datastore , share them throughout jvms. there way make session timeout work , destroy sessions idle period of time?

tweaking gae built-in sessioncleanupservlet solved problem me. more details: http://www.radomirml.com/blog/2011/03/26/cleaning-up-expired-sessions-from-app-engine-datastore/


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