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POCan a Jersey GET request return a polymorphic entity?
 

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    <p>I've got a Resource class that attempts to return an interface type, say "Shape":</p> <pre><code>public interface Shape {...} @XmlRootElement public class Circle implements Shape {...} @Path("/api/shapes") public class ShapeResource { @GET @Path("/{shapeId}") public Shape get(@PathParam("shapeId") String shapeId) { .... return new Circle(); } } </code></pre> <p>Experimenting with the above, I see that the server is returning XML like so:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;circle&gt; ... &lt;/circle&gt; </code></pre> <p>So far so good. The problem is, the client doesn't know how to unmarshall this. I'm getting:</p> <pre><code>com.sun.jersey.api.client.ClientHandlerException: A message body for Java type, interface Shape, and MIME media type, application/xml, was not found </code></pre> <p>Given a WebResource, and asking for an entity type of Shape.class causes an exception.</p> <p>The server seems to be doing the correct thing. I've been struggling for hours on how to get the Client to deserialize this class. I even tried wrapping the interface I'm really trying to get in a wrapper as outlined here: <a href="https://jaxb.dev.java.net/guide/Mapping_interfaces.html" rel="noreferrer">https://jaxb.dev.java.net/guide/Mapping_interfaces.html</a>. That didn't work either.</p> <p>My Client code looks like this:</p> <pre><code> ClientResponse response = get(wr, ClientResponse.class); // wr == WebResource try { return response.getEntity(Shape.class); // &lt;-- FAIL } catch (Exception e) { e.printStackTrace(); // com.sun.jersey.api.client.ClientHandlerException: A message body reader for Java type, interface Shape, and MIME media type, application/xml, was not found } try { return response.getEntity(Circle.class); // &lt;-- WIN, but hacky and forces me to try every concrete type } catch (Exception e) {} return null; </code></pre> <p>Any insight or guidance is greatly appreciated. Thanks in advance.</p>
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    1. USBlaise Doughan
    1. USErik
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    1. COThis should work. I've done it often enough. I think it's a bug in your client code. Can you post it?
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      1. USThe Alchemist
    2. COI updated the original post
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      1. USErik
    3. COHmm, what happens when you add `@XmlRootElement` to `Shape`?
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