validation-messages/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"/>

    <include file="example.xml"/>

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

        <default-action-ref name="index"/>
        <default-class-ref class="org.apache.struts.validation_messages.ExampleSupport"/>

        <action name="index">
            <result type="redirectAction">
                <param name="actionName">Login</param>
            </result>
        </action>

        <action name="Login_*" method="{1}" class="org.apache.struts.validation_messages.Login">
            <result name="input">/WEB-INF/Login.jsp</result>
            <result type="redirectAction">Menu</result>
        </action>

        <action name="Menu">
            <result>/WEB-INF/Menu.jsp</result>
        </action>

    </package>

    <!-- Add addition packages and configuration here. -->
</struts>