Struts 2 Drop Down Example Problem - struts2

Question

i am trying to work on a drop down list using struts2 tag. But till now i am unsuccessful: below is the .jsp page, the action class, the struts.xml file and all relevant codes. Any help will be greatly appreciated. Thank you.
Note: I am getting this error :-> tag 'select', field 'list': The requested list key 'country' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location]
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Index.jsp :
.............
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<%#taglib uri="/struts-tags" prefix="s" %>
<h3>Struts 2: UI Tag Example - Registration Page Demo </h3><hr>
<s:form action="register">
<s:select label="Country" list="country" listKey="countryAbbr" listValue="countryName" />
<s:submit/>
</s:form>
......................
struts.xml:
......................
<package name="com.uitagdemo" extends="struts-default">
<action name="register" class="com.uitagdemo.RegisterAction" >
<result name="success">/success.jsp</result>
<result name="input">/index.jsp</result>
</action>
</package>
...........................
RegisterAction.java
...........................
public class RegisterAction extends ActionSupport {
private List<Country> country;
public String execute() {
return SUCCESS;
}
public List<Country> getCountry(){
country = new ArrayList<Country>();
country.add(new Country("IN", "INDIA"));
country.add(new Country("US", "USA"));
country.add(new Country("FR", "FRANCE"));
return country;
}
}
.......................
success.jsp
.......................
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<%#taglib uri="/struts-tags" prefix="s" %>
Struts 2: UI Tag Example
Struts 2: UI Tag Example - Registration Page Demo
Country: <s:property value="country" /><br>
</body>
......................
Country.java
......................
public class Country {
private String countryAbbr;
private String countryName;
public Country() {
}
public Country(String countryAbbr, String countryName) {
this.countryAbbr = countryAbbr;
this.countryName = countryName;
}
public String getCountryName() {
return countryName;
}
public void setCountryName(String countryName) {
this.countryName = countryName;
}
public String getCountryAbbr() {
return countryAbbr;
}
public void setCountryAbbr(String countryAbbr) {
this.countryAbbr = countryAbbr;
}
}

Answer 1

In this case you are using the Country class as a Map. Simplest solution would be to make a Hashmap property called country with appropriate getter/setters and populate it with what you need.
Then in your JSP you could say something like:
<s:select label="Country" list="country.keys">
or maybe you'd rather
<s:select label="Country" list="country.values">

Answer 2

The workflow should be reverse than above. It should be
action that fills select tag(calls getcountry) -> page with form -> action(to which form will be submitted)
but above we have
page with form -> submitted to action that fills the select, but form has already been displayed.