From Documentation

HttpSessionListener

[Required] Class: HttpSessionListener

ZK Session Cleaner is a listener used to clean up memory when a HTTP session is destroyed.

If you are using Servlet 2.3, please use HttpSessionListener23 instead.

	<listener>
		<description>ZK listener for cleanup when a session is destroyed</description>
		<listener-class>org.zkoss.zk.ui.http.HttpSessionListener</listener-class>
	</listener>

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