unknown-handler/src/main/resources/struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
        "https://struts.apache.org/dtds/struts-2.5.dtd">
<struts>
  <constant name="struts.enable.DynamicMethodInvocation" value="false"/>
  <constant name="struts.devMode" value="true"/>

  <constant name="struts.convention.action.packages" value="org.apache.strutsexamples.web.actions"/>
  <constant name="struts.convention.default.parent.package" value="default"/>

  <bean type="com.opensymphony.xwork2.UnknownHandler" name="tiles-convention" class="org.apache.strutsexamples.web.TilesUnknownHandler"/>

  <package name="default" namespace="/" extends="struts-default">

    <result-types>
      <result-type name="tiles" class="org.apache.struts2.views.tiles.TilesResult" default="true" />
    </result-types>

    <default-action-ref name="index"/>

    <global-results>
      <result name="home" type="redirectAction">
        <param name="actionName">home</param>
        <param name="namespace">/</param>
      </result>
    </global-results>

  </package>

  <unknown-handler-stack>
    <unknown-handler-ref name="tiles-convention"/>
  </unknown-handler-stack>

</struts>