无法使用JAX-B检索多个对象

Question

我正在尝试将对象BookStore和Book的对象列表添加到对象列表中。但我得到以下例外：

例外：

15 Jul, 2013 4:47:07 PM com.sun.jersey.spi.container.ContainerResponse logException
SEVERE: Mapped exception to response: 500 (Internal Server Error)
javax.ws.rs.WebApplicationException: javax.xml.bind.MarshalException
- with linked exception:
[javax.xml.bind.JAXBException: class java.util.ArrayList nor any of its super class is    known to this context.]
at com.sun.jersey.core.provider.jaxb.AbstractRootElementProvider.writeTo(AbstractRootElementProvider.java:159)
at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:306)

这是我的班级：

@GET
@Path("/get")
@Produces(MediaType.APPLICATION_XML)
public ResponseList addObjects() {

    BookStore bookstore = new BookStore();
    bookstore.setName("Bookstore");
    bookstore.setLocation("Book Palace");

    Book book1 = new Book();
    book1.setName("Book2");
    book1.setAuthor("Author2"); 
    Book book2 = new Book();
    book2.setName("Book3");
    book2.setAuthor("Author3");

    ArrayList<Book> Blist = new ArrayList<Book>();
    Blist.add(book1);
    Blist.add(book2);

    ArrayList<Object> list = new ArrayList<Object>();
    list.add(bookstore);
    list.addAll(Blist);

    ResponseList books = new ResponseList();
    books.setList(list);

    System.out.println("returning books : " +books);
    return books;
}

当我打印书籍对象时（见程序的最后一行），我得到以下输出：

returning books : ResponseList [list=[[Book [name=Book2, author=Author2], Book [name=Book3, author=Author3]]]]

但是，当我尝试使用其他客户端获取输出时，我收到错误。这是我的REST客户端：

public class Test {

public static void main(String[] args) {

    ClientConfig config = new DefaultClientConfig();
    Client client = Client.create(config);
    WebResource service = client.resource(getBaseURI());

    ResponseList responseList = service.path("rest").path("BookMain/get").accept(MediaType.APPLICATION_XML).get(ResponseList.class);
    BookStore bs = (BookStore) responseList.getList().get(0);
    ArrayList<Book> lb = (ArrayList<Book>) responseList.getList().get(1);
}

请帮帮忙？

修改

这是我的ResponseList类：

@XmlRootElement
@XmlSeeAlso({BookStore.class,Book.class})
public class ResponseList {

    private List<Object> list;

    public List<Object> getList() {
      return list;
    }
    public void setList(List<Object> list) {
        this.list = list;
    }
}