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Struts2 iterator is not displaying the model object

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My struts2 action class is this. I want to return a list of SampleModel to my jsp. This SampleModel is been created as a List

public class HelloWorld extends BaseActionSupport implements ModelDriven<HelloWorldForm>{

    HelloWorldForm helloWorldForm = new HelloWorldForm();

    private List<SampleModel> sampleModels;
    private List countries;

     public  List getCountries()
        {
              return countries;
        }
     public List<SampleModel> getSampleModel() {
            return sampleModels;
        }
        public void setSampleModel(List<SampleModel> sampleModels) {
            this.sampleModels = sampleModels;
        }
    public String checkMultipleFunc() {
        System.out.println("checked");
        return "success";
    }
    public String execute() throws IOException {
        countries = new ArrayList();

        countries.add("Uganda");
        countries.add("Ukraine");
        countries.add("United States");
        countries.add("United Arab Emirates");
        countries.add("United Kingdom");
        countries.add("Uruguay");
        countries.add("Uzbekistan");


        sampleModels = new ArrayList<SampleModel>();

        SampleModel sampleModel1 = new SampleModel();
        sampleModel1.setData1("d1");
        sampleModel1.setData2("d2");

        sampleModels.add(sampleModel1);

        SampleModel sampleModel2 = new SampleModel();
        sampleModel2.setData1("d11");
        sampleModel2.setData2("d22");

        sampleModels.add(sampleModel2);
        return "success";
    }



    public HelloWorldForm getModel() {

        return helloWorldForm;
    }
}

The object that has to be printed is: 

public class SampleModel {
    public String data1;

    public String data2;

    @Override
    public String toString() {
        return "SampleModel [data1=" + data1 + ", data2=" + data2 + "]";
    }
    public String getData1() {
        return data1;
    }
    public void setData1(String data1) {
        this.data1 = data1;
    }
    public String getData2() {
        return data2;
    }
    public void setData2(String data2) {
        this.data2 = data2;
    }
}

My jsp page is this: 

<body bgcolor="pink">

<s:property value="sampleModels"/>
<s:property value="countries"/>
<s:iterator value="sampleModels" var="eachUser">
    <s:property value="#eachUser.data1"/>
</s:iterator>

 <s:iterator value="countries">

     <s:property /><br>

  </s:iterator>

  <s:iterator value="sampleModels">
    hello
    <s:property />
    <s:property value="data1" />
</s:iterator>
</body>

The country is getting displayed in jsp. But the SampleModels is not getting displayed. I have made all the getters as public only. Not sure what the issue is. Help me solving this issue.

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