Problem with validate function in struts.xml

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I am do according to guide of apache struts tutorial.
In that lession, I do validate value from input field. In struts.xml have 2 line code similar but belong 2 action with 2 method difference. If I drop 1 in 2

<result name="input">/register.jsp</result>

, it will show problem.
Anybody explain to my why.

struts.xml

XML

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

	<constant name="struts.devMode" value="true" />

	<package name="basicstruts2" extends="struts-default">
		<action name="hello"
			class="org.apache.struts.helloworld.action.HelloworldAction" method="execute">
			<result name="success">/HelloWorld.jsp</result>
		</action>
		
		<action name="index">
			<result>/index.jsp</result>
		</action>
		
		<action name="register" class="org.apache.struts.register.action.Register" method="execute">
			<result name="success">/thankyou.jsp</result>
			<result name="input">/register.jsp</result> 
		</action>
		
		<action name="registerInput" class="org.apache.struts.register.action.Register" method="input" >
		    <result name="input">/register.jsp</result>
		</action> 
	</package>

</struts>

Register.java

Java

package org.apache.struts.register.action;

import org.apache.struts.register.model.Person;

import com.opensymphony.xwork2.ActionSupport;

public class Register extends ActionSupport{
	private Person personBean;
	
	@Override
	public String execute() throws Exception {
	
		return SUCCESS;
	}

	public Person getPersonBean() {
		return personBean;
	}

	public void setPersonBean(Person personBean) {
		this.personBean = personBean;
	}
	
	public void validate(){
		if ( personBean.getFirstName().length() == 0){
			addFieldError("personBean.firstName", "First name is required.");
		}
		
		if (personBean.getEmail().length() == 0){
			addFieldError("personBean.email", "Email is required.");
		}
		
		if (personBean.getAge() < 18){
			addFieldError("personBean.age", "Age is required and must be 18 or older");
		}
	}
}

register.jsp

ASP.NET

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags" %>    
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Register</title>
<s:head/>
</head>
<body>
<h3>Register for a prize by completing this form.</h3>

<s:form action="register">
	<s:textfield key="personBean.firstName"></s:textfield>
	<s:textfield key="personBean.lastName"></s:textfield>
	<s:textfield key="personBean.email"></s:textfield>
	<s:textfield key="personBean.age"></s:textfield>
	
	
	<s:submit></s:submit>
	
</s:form>

</body>
</html>

Posted 12-Jan-16 16:02pm

Dang Duy Hoang

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