Storing a reference to the object in ArrayList

Hey everyone i am trying to store the current reference to an arraylist "pl". e.g. pl.add(this); for some reason i only get the reference to the last item and none of the previous ones. The Loop does go through all three items tho.

Below is the code and out put i am getting. Can anyone tell me what i am doing wrong thank you for the help in advance.

       // variables
private String productType;
private String hyperLinkParam;
private ArrayList <ProductList> pl = new ArrayList<ProductList> ();

public ProductList() {

    try {

        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();

       InputStream url = null;
        url = getClass().getResourceAsStream("inventory.xml");


        Document doc = db.parse(url);
        doc.getDocumentElement().normalize();

        // loop through each item
        NodeList items = doc.getElementsByTagName("item"); //Returns a list of elements with the given tag name item
        for (int i = 0; i < items.getLength(); i++)
        {

                Element e = (Element) items.item(i);
                setHyperLinkParam(e.getAttribute("name").toString());
                setProductType(getTextValue(e,"productType"));
                System.out.print(e.getAttribute("name").toString());
                System.out.println(getTextValue(e,"productType"));

                pl.add(this);


         }

          for(int j=0; j < pl.size(); j++){
            System.out.print("getHyperLinkParam: " + pl.get(j).getHyperLinkParam());
            System.out.println("getProductType: " + pl.get(j).getProductType());
          }

Manufacture.java

    @WebMethod(operationName = "getProductList")
public ProductList getProductList() {
    try {
        ProductList productlist = new ProductList();
        if(productlist == null){
            return null;
        }else{
            return productlist;
        }
    } catch(Exception e){
        System.out.println("error: " + e.getMessage());
        return null;
    }
}

index.jsp

    <%
try {
org.soen487.supplychain.manufacturer.Manufacture_Service service = new org.soen487.supplychain.manufacturer.Manufacture_Service();
org.soen487.supplychain.manufacturer.Manufacture port = service.getManufacturePort();
// TODO process result here
org.soen487.supplychain.manufacturer.ProductList result = port.getProductList();
out.println("Result = "+result);

} catch (Exception ex) {
// TODO handle custom exceptions here
}
%>