As a result it is easy to set it up in a file web.xml. Below is a configuration file from a real commercial project. Usually these files do not get any more complicated:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name>activeweb</display-name>
<filter>
<filter-name>dispatcher</filter-name>
<filter-class>org.javalite.activeweb.RequestDispatcher</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>exclusions</param-name>
<param-value>css,images,js,html,ico,png</param-value>
</init-param>
<init-param>
<param-name>root_controller</param-name>
<param-value>home</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>dispatcher</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>