Jayesh typed the following on 08:00 AM 1/17/2001 -0800
>I need to do some work when tomcat session gets timed out. Could anyone of
>you suggest how I can do it.
With servlet 2.2 (Tomcat 3.x) you should make sure one of the attributes you're
adding to the session implements HttpSessionBindingListener. When the session
gets timed out, the container will call valueUnbound() on that object. As long as
you know you're not the one unbinding the object (e.g. by calling removeAttribute()
or replacing the attribute by calling setAttribute() with the same name), you can
assume the session is being expired or invalidated.
With servlet 2.3 (Tomcat 4.x) you can also create an object which implements
HttpSessionListener, and configure it in your web.xml like this:
<web-app>
<listener>
<listener-class>com.foo.SessionAttributeSnoop</listener-class>
</listener>
</web-app>
This object will have its sessionDestroyed() method called
when it is destroyed for any reason.
Of course, if the server goes down in a bad way none of these
events will be called, so there are no guarantees.
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