| HttpFacesContextFilter |
This class filter the zkLoader and au request, and initial a FacesContext for this request,
so, You can access FacesContext by FacesContext.getCurrentInstance();
Configuration in web.xml
<filter>
<filter-name>ZK FacesContext Filter</filter-name>
<filter-class>org.zkoss.jsf.zul.util.HttpFacesContextFilter</filter-class>
<init-param>
<param-name>update-uri</param-name>
<param-value>/zkau</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>ZK FacesContext Filter</filter-name>
<servlet-name>zkLoader</servlet-name>
</filter-mapping>
<filter-mapping>
<filter-name>ZK FacesContext Filter</filter-name>
<servlet-name>auEngine</servlet-name>
</filter-mapping>
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