Question

I’m a beginner with JAX RS architecture. I’ve made a simple class like this:

@XmlRootElement
public class DatoBase 

    {

      private int _id;
      private String _name;
      private int[] _listId;

//...here all get and set methods
}

This class, as you can see has an array (_listId), correctly initialized.
I’ve made my web services, that correctly istantiate and POST a new element of DatoBase, and I’ve made a method to GET this element, that is:

    @GET
    @Produces("application/json")
    @Path("{id}")
    public DatoBase GetDato(@PathParam("id") int dId)
    {
        return dati.get(dId);
    }

where dati is declared as:

private TreeMap<Integer,DatoBase> dati = new TreeMap<Integer,DatoBase>();

but when I try to get the element i’ve already posted, i see this structure:

{"id":"0","name":"Dato10"}

I can’t see my _listId structure (initialized with 3 elements) in this output.

I expected an output like this:

{"id":"0","name":"Dato10","listId":[...]}

Could anyone help me or tell me why?
Thank you

Answer 1

You should annotate your array with @XmlElementWrapper.

@XmlElementWrapper
private int[] _listId;

See here for further reference.