public void _testNamespaces(JsonJaxbContext ctx) throws Exception {

    final JsonMarshaller jm = ctx.createJSONMarshaller();
    final JsonUnmarshaller ju = ctx.createJSONUnmarshaller();
    final StringWriter sw = new StringWriter();

    final MyResponse one = JSONTestHelper.createTestInstance(MyResponse.class);

    jm.marshallToJSON(one, sw);

    System.out.println(String.format("%s", sw));

    MyResponse two;
    two = ju.unmarshalFromJSON(new StringReader(sw.toString()), MyResponse.class);

    assertEquals(one, two);
  }