In order to facilitate view rendering, a ViewRendererServlet must be added to the web.xml file. This servlet is not invoked directly, but it used by Web Flow to render views in a portlet environment.

<servlet>
    <servlet-name>ViewRendererServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.ViewRendererServlet</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>ViewRendererServlet</servlet-name>
    <url-pattern>/WEB-INF/servlet/view</url-pattern>
</servlet-mapping>