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假设这个 JAX-RS 方法： 

@GET
@Path("/{id}")
@Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
public Employee get(@PathParam("id") Long id) {
     return myService.findbyId(id);
}

使用以下 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...)
}

这适用于 RESTeasy/spring-MVC 集成。如果我从网络浏览器调用该方法；我可以得到以下答案： 

<employee Id="17">
    <name>Marc</name>
    <headOffice>accounting</headOffice>
</employee>

但是，如果我使用 RESTeasy Client Framework 进行单元测试。客户端代理生成的仅解组 Employee Parent 类，我丢失了子信息（Manager.headOffice 或 SepcialEmployee.Skill）。下面是我的 Junit 测试的摘录： 

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);
 }
}
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