JaxbContext如何处理Java继承？

Question

我正在尝试解组POJO生成xsds。
但是，我收到此错误

  

java.lang.ClassCastException：无法将动物投掷到Dog

这是我的代码。
Animal.java

public class Animal { 
  .... }

Dog.java

public class Dog Extends Animal {
  public void validate() //Additional method
  { 
   ....
  }}

JAXBContext

String input = "..."; //xml file
JAXBContext jc = JAXBContext.newInstance（Dog.class);
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
JAXBElement<Dog> element = (JAXBElement<Dog> unmarshaller
   .unmarshal(new ByteArrayInputStream(input.getBytes());
Dog dog = element.getValue();