列表中的对象未转换为XML

Question

I have an 'Order' class which contains a list of objects of class 'Triplet'. When I try to get an order object in xml format I get all other data properly except this. Following is the code snippet:

Order.java:

@XmlRootElement
public class Order {
    private String orderid;
    private String orderStatus;
    private String paidStatus;
    private String address;
    private double total;
    private String emailid;
    private String username;
    private List<Triplet> movies=new ArrayList<>();
    public Order(String orderid, String orderStatus, String paidStatus,      String address, double total, String emailid,
        String username) {
    super();
    this.orderid = orderid;
    this.orderStatus = orderStatus;
    this.paidStatus = paidStatus;
    this.address = address;
    this.total = total;
    this.emailid = emailid;
    this.username = username;
}

public Order(String orderid, String orderStatus, String paidStatus, String address, double total, String emailid,
        String username, List<Triplet> movies) {
    super();
    this.orderid = orderid;
    this.orderStatus = orderStatus;
    this.paidStatus = paidStatus;
    this.address = address;
    this.total = total;
    this.emailid = emailid;
    this.username = username;
    this.movies = movies;
}


    public Order() {
    super();
}
 //getters and setters
public String getOrderid() {
    return orderid;
}
public void setOrderid(String orderid) {
    this.orderid = orderid;
}
public String getOrderStatus() {
    return orderStatus;
}
public void setOrderStatus(String orderStatus) {
    this.orderStatus = orderStatus;
}
public String getPaidStatus() {
    return paidStatus;
}
public void setPaidStatus(String paidStatus) {
    this.paidStatus = paidStatus;
}
public String getAddress() {
    return address;
}
public void setAddress(String address) {
    this.address = address;
}
public double getTotal() {
    return total;
}
public void setTotal(double total) {
    this.total = total;
}
public String getEmailid() {
    return emailid;
}
public void setEmailid(String emailid) {
    this.emailid = emailid;
}
public String getUsername() {
    return username;
}
public void setUsername(String username) {
    this.username = username;
}
public List<Triplet> getMovies() {
    return movies;
}
public void setMovies(List<Triplet> movies) {
    this.movies = movies;
}
    public Order getObject(){
        Order o=new Order();
        o.setAddress("address1");
        o.setEmailid("email");
        o.setOrderid("orderid");
        o.setOrderStatus("in process");
        o.setPaidStatus("n");
        o.setTotal(250.5);
        o.setUsername("admin");
        movies.add(new Triplet(1L,2,200.0));
        movies.add(new Triplet(2L,3,150.0));
        o.setMovies(movies);
        return o;
    }
}

Triplet.java:

@XmlRootElement
public class Triplet implements Serializable {

 private long movieid;
    private int quantity;
    private double price;



    public Triplet() {
        super();
    }

    public Triplet(long movieid, int quantity, double price) {
        this.movieid = movieid;
        this.quantity = quantity;
        this.price = price;
    }

    public long getMovieid() { return movieid; }
    public int getQuantity() { return quantity; }
    public double getPrice() { return price; }
}

OrderResource.java:

@Path("/orders")
public class OrderResource {
OrderService os=new OrderService();

@GET
@Produces(MediaType.APPLICATION_XML)
@Path("/{emailid}")
public Order getOrderByCustomer(@PathParam("emailid") String emailid){
    Order o=new Order();
    return o.getObject();
}
}

Output:

<order>
<address>address1</address>
<emailid>email</emailid>
<movies/>
<movies/>
<orderStatus>in process</orderStatus>
<orderid>orderid</orderid>
<paidStatus>n</paidStatus>
<total>250.5</total>
<username>admin</username>
</order>

What can be done to get proper values in movies?

Edit

The problem was that the list of Triplet class object in Order object was not getting converted to XML.

To solve this problem adding an annotation - @XmlAccessorType(XmlAccessType.FIELD) to Triplet class works as mentioned in the EDIT part of the answer given by dsp_user.

Answer 1

Change movies.add to o.movies.add . You are modifying the list of movies that is held by this reference whereas in getObject method you are returning a different instance all together.

Answer 2

You're not getting any values in <movies> because the Order class has no getter for the movies property/field. Change your Order class to something like

@XmlRootElement
public class Order {
...
 @XmlElement
private List<Triplet> movies;

public List<Triplet> getMovies(){
  if(movies == null)
     movies = new ArrayList<Triplet>();

  return movies;
}
 ....
   //The setter for  movies isn't necessary because you can add new movies 
   //by calling getMovies().add(new Movie(1L,2,300.0));

}

I haven't tried this with your data but I've done something similar in the past so I know it should work.

EDIT: I've now tried your code and it works if you just add one annotation to the Triplet class.

 @XmlAccessorType(XmlAccessType.FIELD)
 public class Triplet  {
 ...
 }

I tested with this code (both the commented and uncommented)

 final String ORDER_XML = "C:\\test\\Order.xml";

    JAXBContext context = JAXBContext.newInstance(Order.class);
    Marshaller m = context.createMarshaller();

    m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);

    Order o = new Order();

   /* o.setAddress("address1");
    o.setEmailid("email");
    o.setOrderid("orderid");
    o.setOrderStatus("in process");
    o.setPaidStatus("n");
    o.setTotal(250.5);
    o.setUsername("admin");

    o.getMovies().add(new Triplet(1L,2,200.0));
    o.getMovies().add(new Triplet(2L,3,150.0));
    o.getMovies().add(new Triplet(3L,3,400.0));*/
    //o.setMovies(movies);
    m.marshal(o.getObject(), new File(ORDER_XML));

The generated XML

    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<order>
    <address>address1</address>
    <emailid>email</emailid>
    <movies>
        <movieid>1</movieid>
        <quantity>2</quantity>
        <price>200.0</price>
    </movies>
    <movies>
        <movieid>2</movieid>
        <quantity>3</quantity>
        <price>150.0</price>
    </movies>
    <orderStatus>in process</orderStatus>
    <orderid>orderid</orderid>
    <paidStatus>n</paidStatus>
    <total>250.5</total>
    <username>admin</username>
</order>