Struts Error: javax.servlet.jsp.JspException: Cannot find bean: "ListForm" in any scope

Hai I wrote a Struts Code which populates States list on choosing a Selected Country Using AJAX and It is showing me the Error as
javax.servlet.jsp.JspException: Cannot find bean: "ListForm" in any scope

My Entire Code is as below
INDEX.jsp
<%@ page language="java" import="java.util.*,example.*" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>

<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>

<!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>Insert title here</title>
<script type="text/javascript">
function getStates(str)
{
var xmlhttp;
if(str=="")
{
document.getElementById("result").innerHTML="Please Choose a Country";
return;
}
if(window.XMLHttpRequest)
{
xmlhttp=new XMLHttpRequest();
}
else
{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("GET","getList.do?country="+str,true);
xmlhttp.onreadystatechange=function()
{

if(xmlhttp.readyState==4||xmlhttp.status==200)
{
document.getElementById("statesList").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.send(null);
}
</script>

</head>
<body>
<html:form action="getList.do">
<html:select property="country" onchange="getStates(this.value)">
<html

ption value="select">Select</html

ption>
<html

ption value="India">India</html

ption>
<html

ption value="America">America</html

ption>
<html

ption value="Australia">Australia</html

ption>
</html:select>
<div id="result"></div>
<bean:define id="statesList" name="ListForm" property="statesList"></bean:define>
<html:select property="states">
<html

ptions collection="statesList"/>
</html:select>
</html:form>
</body>
</html>

FormBean(ListForm)
package example;
import org.apache.struts.action.ActionForm;
import java.util.ArrayList;
public class ListForm extends ActionForm
{
private ArrayList statesList;
private String country;
private String states;

public void setStates(String states)
{
this.states=states;
}
public void setCountry(String country)
{
this.country=country;
}
public String getCountry()
{
return country;
}
public String getStates()
{
return states;
}
public void setStatesList(ArrayList statesList)
{
this.statesList=statesList;
}
public ArrayList getStatesList()
{
return statesList;
}
}

ACTIONCLASS(ListAction)
package example;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.Iterator;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class ListAction extends Action
{
public ActionForward execute(ActionMapping mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response) throws Exception
{
ListForm myform=(ListForm)form;
String country=myform.getCountry();
ArrayList states=displayStates(country);
request.getSession().setAttribute("statesList",states);
return null;

}
public ArrayList displayStates(String country)
{
ArrayList statesList=new ArrayList();
if(country.equals("India"))
{
statesList.add("India1");
statesList.add("India2");
statesList.add("India3");
statesList.add("India4");
}
else if(country.equals("America"))
{
statesList.add("America1");
statesList.add("America2");
statesList.add("America3");
statesList.add("America4");
}
else if(country.equals("Australia"))
{
statesList.add("Australia1");
statesList.add("Australia2");
statesList.add("Australia3");
}
return statesList;
}

}

Struts-Config.XML
<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
"http://struts.apache.org/dtds/struts-config_1_2.dtd">

<struts-config>
<data-sources>
</data-sources>
<form-beans>
<form-bean name="myform" type="example.ListForm"></form-bean>
</form-beans>
<global-forwards>
</global-forwards>
<action-mappings>
<action path="/getList" name="myform" scope="request" type="example.ListAction" input="/index.jsp">
</action>
</action-mappings>
<controller>
</controller>
</struts-config>

Please get me out from that Error.

The <bean:define> name attribute looks "ListForm" in any of the scope. Since the same is not avail in any of the scope, the specified error occurs. Please add below code snippets in your action.

request.getSession().setAttribute("ListForm",myform);
myform.setStatesList(states);