UnmarshalException when getting json array with Jersey

Question

Our Application has a Class that wraps Jersey REST functionality. One Method is public <T extends Storable> List<T> retrieve(Class<T[]> pCls) throws StorageException, that is called like retrieve(Item[].class) to get the whole List of Items from the resource /items (see below).

The answer from the server is [{"price":1.0,"specialPrice":0.0,"name":"Beverage","special":false,"category":"BEVERAGE","cost":0.0,"available":false,"id":0},{"price":2.0,"specialPrice":0.0,"name":"Meal","special":false,"category":"DISH","cost":0.0,"available":false,"id":0}], which is what I expect.

But the Application exits with Exception in thread "main" javax.ws.rs.WebApplicationException: javax.xml.bind.UnmarshalException, with linked exception [com.sun.istack.internal.SAXParseException2; lineNumber: 1; columnNumber: 14; unexpected element (uri:"", local:"price"). Expected elements are <{}article>,<{}item>].

Code for retrieve (client):

ClientResponse cr = this.resource.path(resourcePath)
                .accept(MediaType.APPLICATION_JSON_TYPE)
                .get(ClientResponse.class);

        T[] a = cr.getEntity(pCls);

Code for the resource (on the server):

@Path("/items")
public class ItemListResource {
    @GET
    @Produces(MediaType.APPLICATION_JSON)
    @Consumes(MediaType.APPLICATION_JSON)
    public Response getItemList() {
        LinkedList<Item> l = new LinkedList<Item>();
        l.add(new Item(1.0, "Beverage", Category.BEVERAGE));
        l.add(new Item(2.0, "Meal", Category.DISH));
        return Response.ok(l).build();
    }
}

Code for Item:

@XmlRootElement
public class Item extends Article {
    private Category category;
    private double cost;
    private boolean available;
};

score 2 · Accepted Answer · edited May 23 '17 at 12:03

2

I solved the Problem by using Jackson like in this answer: https://stackoverflow.com/a/9725228/1116842

ClientConfig cfg = new DefaultClientConfig();
cfg.getClasses().add(JacksonJsonProvider.class);
Client client = Client.create(cfg);

Matt Ball says:

Jackson's MessageBodyReader implementation appears to be more well-behaved than the Jersey JSON one.

edited May 23 '17 at 12:03

Community

1
1

answered Sep 14 '12 at 19:55

moi

1,835
2
18
25

score 0 · Answer 2 · edited May 23 '17 at 11:49

0

I'm not quite sure, but it looks like you're expecting a JASON Object but are getting an XML one. Just found this on Stackoverflow, maybe it's applicable to your problem?

Getting JSON out put from restful java client

edited May 23 '17 at 11:49

Community

1
1

answered Sep 14 '12 at 11:52

pygospa

43
5

Nope, sorry. As written above, the response from the server is like expected. – moi Sep 14 '12 at 12:54

UnmarshalException when getting json array with Jersey

Code for retrieve (client):

Code for the resource (on the server):

Code for Item:

2 Answers2