Problem with session timeout.

<?xml version="1.0" encoding="utf-8" ?>
<zk>
	<listener>
		<description>ThreadLocal Synchronization Listener</description>
		<listener-class>org.zkoss.zkplus.util.ThreadLocalListener
		</listener-class>
	</listener>
	<preference>
		<name>ThreadLocal</name>
		<value>
			org.springframework.security.context.ThreadLocalSecurityContextHolderStrategy=contextHolder
		</value>
	</preference>
	<!-- <language-config> <addon-uri>/WEB-INF/zk-analytics-addon.xml</addon-uri> 
		</language-config> -->
	<session-config>
		<device-type>ajax</device-type>
    	<automatic-timeout/>
		<timer-keep-alive>true</timer-keep-alive>
		<timeout-message>My custom timeout-message. Cönäining Ümläüts.</timeout-message>
	</session-config>
	<library-property>
		<name>org.zkoss.zul.Button.mold</name>
		<value>trendy</value>
	</library-property>
	<library-property>
		<name>org.zkoss.zul.progressbox.position</name>
		<value>center,center</value>
	</library-property>
</zk>

<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	
	<session-config>
      <session-timeout>1</session-timeout> 
    </session-config>
    
	<!-- Spring Security -->
	<filter>
		<filter-name>springSecurityFilterChain</filter-name>
		<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
	</filter>

	<filter-mapping>
		<filter-name>springSecurityFilterChain</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

	<listener>
		<listener-class>
			org.springframework.security.web.session.HttpSessionEventPublisher</listener-class>
	</listener>

	<!-- MDC Username-logging -->
	<filter>
		<filter-name>mdcUsernameFilter</filter-name>
		<filter-class>tv.px.common.PrincipalMdcFilter</filter-class>
	</filter>
	
	<filter-mapping>
		<filter-name>mdcUsernameFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

	<!-- Spring -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>/WEB-INF/webapp-context.xml</param-value>
	</context-param>

	<!-- Hibernate -->
	<filter>
		<filter-name>hibernateFilter</filter-name>
		<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>hibernateFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

	<!-- ZK -->

	<listener>
		<description>
			Used to cleanup when a session is destroyed
		</description>
		<display-name>ZK Session Cleaner</display-name>
		<listener-class>org.zkoss.zk.ui.http.HttpSessionListener</listener-class>
	</listener>

	<servlet>
		<description>ZK loader for evaluating ZK pages</description>
		<servlet-name>zkLoader</servlet-name>
		<servlet-class>org.zkoss.zk.ui.http.DHtmlLayoutServlet</servlet-class>
		<!-- Must. Specifies URI of the update engine (DHtmlUpdateServlet). -->
		<init-param>
			<param-name>update-uri</param-name>
			<param-value>/zkau</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup><!-- MUST -->
	</servlet>
	<servlet-mapping>
		<servlet-name>zkLoader</servlet-name>
		<url-pattern>*.zul</url-pattern>
	</servlet-mapping>
	<servlet-mapping>
		<servlet-name>zkLoader</servlet-name>
		<url-pattern>*.zhtml</url-pattern>
	</servlet-mapping>
	<servlet>
		<description>The asynchronous update engine for ZK</description>
		<servlet-name>auEngine</servlet-name>
		<servlet-class>org.zkoss.zk.au.http.DHtmlUpdateServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>auEngine</servlet-name>
		<url-pattern>/zkau/*</url-pattern>
	</servlet-mapping>

	<servlet>
		<servlet-name>remoting</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name>remoting</servlet-name>
		<url-pattern>/remoting/*</url-pattern>
	</servlet-mapping>


	<!-- //// -->
	<!-- MIME mapping -->
	<mime-mapping>
		<extension>gif</extension>
		<mime-type>image/gif</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>html</extension>
		<mime-type>text/html</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>htm</extension>
		<mime-type>text/html</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>jad</extension>
		<mime-type>text/vnd.sun.j2me.app-descriptor</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>jpeg</extension>
		<mime-type>image/jpeg</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>jpg</extension>
		<mime-type>image/jpeg</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>js</extension>
		<mime-type>application/x-javascript</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>png</extension>
		<mime-type>image/png</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>txt</extension>
		<mime-type>text/plain</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>xml</extension>
		<mime-type>text/xml</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>zhtml</extension>
		<mime-type>text/html</mime-type>
	</mime-mapping>
	<mime-mapping>
		<extension>zul</extension>
		<mime-type>text/html</mime-type>
	</mime-mapping>
	<welcome-file-list>
		<welcome-file>index.zul</welcome-file>
	</welcome-file-list>
</web-app>