s are sent after the binding methods complete. For session that are
 invalidated or expire, notifications are sent after the session has been invalidated or expired.

 <p>
 When container migrates a session between VMs in a distributed container setting, all session attributes implementing
 the <a href="../../../jakarta/servlet/http/HttpSessionActivationListener.html" title="interface in jakarta.servlet.http"><code>HttpSessionActivationListener</code></a> interface are notified.
 
 <p>
 A servlet should be 