how to support Polymorphism with RESTeasy Client proxy? - spring-mvc

Question

suppose this JAX-RS method :
#GET
#Path("/{id}")
#Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
public Employee get(#PathParam("id") Long id) {
return myService.findbyId(id);
}
With the following POJO:
#XmlRootElement
public class Employee {
Integer id;
String name; (getters;setters etc...)
}
#XmlRootElement(name="employee")
public class SepcialEmployee extends Employee {
Skill skill; (getters;setters etc...)
}
#XmlRootElement(name="employee")
public class Manager extends Employee {
String headOffice; (getters;setters etc...)
}
This works fine with RESTeasy/spring-MVC integration. And if I call the method from a web browser; I can get the following answer for i.e.:
<employee Id="17">
<name>Marc</name>
<headOffice>accounting</headOffice>
</employee>
But if I use the RESTeasy Client Framework for my unit test. the client proxy generated unmarsalles only the Employee Parent class and I loose the child informations (Manager.headOffice or SepcialEmployee.Skill). Below an extract of my Junit test:
public class Test {
#Path("empl")
public interface EmpProxy {
#GET
#Produces(MediaType.APPLICATION_XML)
Employee getEmployee(#ClientURI String uri);
}
private static TJWSEmbeddedSpringMVCServer server;
public static final String host = "http://localhost:8080/";
public static final int port = 8080;
private static EmpProxy proxy;
#BeforeClass
public static void setup() {
server = new TJWSEmbeddedSpringMVCServer("classpath:test-dispatcher-servlet.xml", port);
server.start();
RegisterBuiltin.register(ResteasyProviderFactory.getInstance());
ResteasyClient client = new ResteasyClientBuilder().build();
ResteasyWebTarget target = client.target(host);
proxy = target.proxy(EmpProxy.class);
}
#Test
public void test(){
String url = host+"/empl/17";
Employee employee = proxy.getEmployee(url);
System.out.println(employee);
}
}