How to call beforeSessionDestroyed of SessionListener

[Umesh Kudtarkar]

Hi,
I am trying to find out how to call beforeSessionDestroyed. From Tomcat
5.5 code I see following
in org.apache.catalina.session.StandardSession

        fireContainerEvent(context,
                             "beforeSessionDestroyed",
                                           listener);

But not sure how it is called. Has anyone tried this? Any suggestions?

Thanks,
Umesh