Unit test returning json fails to parse response

[KARR, DAVID (ATTSI)]

I'm building a service using CXF 2.4.1 by reusing most of the setup of a 
project that was using CXF 2.3.2.  The first project was using Jackson, but I'm 
going to try using Jettison for this.

My first unit test method uses the default of xml, and that parses the response 
just fine.  The second method uses the ".json" extension, and I see in the 
console output that it returned a Jettison-formatted JSON response (it had the 
namespace prefix on the element name), but it just said this (class name 
changed):

Jul 12, 2011 8:12:15 AM org.apache.cxf.jaxrs.client.AbstractClient 
reportMessageHandlerProblem
SEVERE: .Problem with reading the response message, class : class 
mypackage.Myclass, ContentType : application/json.

I'm referencing "cxf-rt-transports-http" and "cxf-rt-frontend-jaxrs" in my POM.

The following is in my unit test class (with some class names and paths 
changed):
------------------------
    @BeforeClass
    public static void startServer() {
        setController(new StuffController());
        getController().init();

        ServerFactory.create(getController(), TestHelper.BASE_SERVICE_URI);
    }
    
    @Test
    public void testBasic() throws Exception {
        getController().setService(service);
        
        WebClient   client  = 
WebClient.create(TestHelper.BASE_SERVICE_URI).path("/stuff");
        
        Stuffs    mockStuffs    = new Stuffs();
        when(service.getStuff()).thenReturn(mockStuffs);
        
        Stuffs    stuffs    = client.get(Stuffs.class);
        assertThat(stuffs).isNotNull();
    }
    
    @Test
    public void testBasicJson() throws Exception {
        getController().setService(service);
        
        WebClient   client  = 
WebClient.create(TestHelper.BASE_SERVICE_URI).path("/stuff.json");
        
        Stuffs    mockStuffs    = new Stuffs();
        when(service.getStuff()).thenReturn(mockStuffs);
        
        Stuffs    stuffs    = client.get(Stuffs.class);
        assertThat(stuffs).isNotNull();
    }
---------------

This is my ServerFactory class:
----------------------
public class ServerFactory {
    public static void create(Object serviceBean, String uri) {
        JAXRSServerFactoryBean  sf  = new JAXRSServerFactoryBean();

        BindingFactoryManager   manager = 
sf.getBus().getExtension(BindingFactoryManager.class);
        JAXRSBindingFactory     factory = new JAXRSBindingFactory();
        factory.setBus(sf.getBus());
        manager.registerBindingFactory(JAXRSBindingFactory.JAXRS_BINDING_ID, 
factory);
        
        Map<Object, Object> extensionsMap   = new HashMap<Object, Object>();
        extensionsMap.put("json", "application/json");
        extensionsMap.put("xml", "application/xml");

        sf.setExtensionMappings(extensionsMap);

        sf.setServiceBean(serviceBean);
        sf.getInInterceptors().add(new LoggingInInterceptor());
        sf.getOutInterceptors().add(new LoggingOutInterceptor());
        
        sf.setAddress(uri);
        
        sf.create();
    }
}
--------------------