@ManagedProperty annotated type returns null

I have this Service bean:

@Stateless
public class BookService
{
    @PersistenceContext(unitName="persistentUnit")
    protected EntityManager entityManager;

    public BookModel find(Long id) {
       return entityManager.find(BookModel.class, id);
    }
}

And the backing bean for the Facelet page is:

@ManagedBean(name = "bookBean")
@RequestScoped
public class BookBean implements Serializable
{
    @EJB
    private BookService bookService;

    @ManagedProperty(value="#{param.id}")
    private Long id;

    private DataModel<BookModel> books;
    private BookModel currentBook;

    @PostConstruct
    public void init() {
        if (id == null) {
           // UPDATE: Retrieve a list of books.
        } else { 
           // UPDATE: id shouldn't be null here.
           // Get detail info about a book using the id
           currentBook = bookService.find(id);
        }
    }

    public Long getId() {
       return id;
    } 

    public void setId(Long id) {
       this.id = id;
    } 

    public BookModel getCurrentBook() {
       return currentBook;
    }

    public void setCurrentBook(BookModel currentBook) {
       this.currentBook = currentBook;
    }
 }

Why is the value of id always returns null even though the URL returned as bookedit.jsf?id=5418 I don't understand this.

Also, I find the EntityManager#find method quite restrictive in that it only accept a primary key value as the second parameter.开发者_运维知识库 What if I want to pass a [hashed] value instead of the primary key. How can I do this with the EntityManager#find method?

P.S. I notice the EntityManager#find requirement is the same for both OpenJPA and EclipseLink implementations. Hmm...

I just tried this in one of my managed beans, and it is working. Here's the relevant code, it's basically the same as yours:

@ManagedBean
@RequestScoped
public class TestBean {
    @ManagedProperty(value = "#{param.id}")
    private Long prop;

    @PostConstruct
    public void init() {
        System.out.println(prop);
        // prints 1234 if I go to the url with http://localhost/page.jsf?1234
    }

    public Long getProp() {
        return prop;
    }

    public void setProp(Long prop) {
        this.prop = prop;
    }
}

I'm running this on glassfish 3.1.1. The only thought I had is maybe the injected EJB is somehow messing up the request scope in the ManagedBean?