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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