Struts2 JSON プラグインは、AJAX 呼び出しのデータ構造をどのようにシリアル化しますか?

<result type="json">
    <param name="root">
        objectToBeSerialized
    </param>
</result>

private CustomObject objectToBeSerialized;

public CustomObject getObjectToBeSerialized() {
    return this.objectToBeSerialized;
}

row1 [col1, col2], 
row2 [col1, col2], 
rowN [col1, col2]

public class MyRow implements Serializable {
    private String col1; 
    private String col2;

    // Getters
}

public class PartAction implements Serializable {
    private List<MyRow> rows; 

    // Getter
    public  List<MyRow> getRows() { 
        return this.rows; 
    } 

    public String finder() {
        rows = new ArrayList<MyRow>();

        // Populate the list with data
    }
} 

<result type="json" >
    <param name="root">
        rows
    </param>
</result>

var handledata = function(data) {
    $.each(data, function(index) {
        alert(data[index].col1);
        alert(data[index].col2);
    });     
}