You could try annotating it with @ManagedBean - just to prod the runtime into realizing it really does want to do injection on it ...
Moises
Sent from my iPhone
On Jan 19, 2011, at 4:29 PM, Antonio Goncalves <antonio.mailing_at_gmail.com> wrote:
> Hi all,
>
> I have a simple EJB 3.1 with no interface (ItemEJB) that does access to the database using an Entity.
>
> @Stateless
> public class ItemEJB {
>
> @PersistenceContext
> private EntityManager em;
>
> public Book getBook(Long id) {
> return em.find(Book.class, id);
> }
> }
>
>
> In front of this EJB I have a Servlet 3.0 that injects the EJB and uses it :
>
> @WebServlet(urlPatterns = "/itemServlet")
> public class ItemServlet extends HttpServlet {
>
> @EJB // or @Inject with CDI work fine
> private ItemEJB itemEJB;
>
> @Override
> protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
>
> // Creates an instance of book
> Book book = new Book("title", 999.99F, "description", 666, false, "english", "scifi");
> itemEJB.createBook(book);
>
> resp.setContentType("text/html");
> PrintWriter out = resp.getWriter();
> out.println("<h1>====== All books</h1>");
> List<Book> books = itemEJB.findAllBooks();
> for (Book b : books) {
> out.println("==> " + b + "<br/>");
> }
> }
>
> As you can see, I can either inject the EJB using the good old @EJB or the new @Inject (with the famous empty beans.xml file). In both cases I manage to make this servlet work in GlassFish 3.1-b37 and 3.0.1-b22.
>
>
> If I do the same with a REST service, neither case works, I always get a NPE (with @EJB, @Inject, both versions of GlassFish... I always get a NPE). So the following code never works :
>
> @Path("/items")
> public class ItemResource {
>
> @EJB // or @Inject with CDI produces a NPE
> private ItemEJB itemEJB;
>
> @GET
> @Path("/{bookKey}")
> @Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
> public Book getBook(@PathParam("bookKey") Long id) {
> return itemEJB.getBook(id);
> }
> }
>
> Then, if I turn this REST service into an EJB by adding a @Stateless annotation as follow :
>
> @Path("/items")
> @Stateless
> public class ItemResource {
>
> @EJB // or @Inject with CDI
> private ItemEJB itemEJB;
> ...
> }
>
> the @EJB and @Inject work with both GlassFish 3.1-b37 and 3.0.1-b22.
>
> I have read several posts about this (including old ones : http://blogs.sun.com/sandoz/entry/ejb_injection) but I'm still confused. Can I inject an EJB into a REST service that is not itself an EJB (i.e. it is just annotated with @Path).
>
> Thanks
>
> --
> Antonio Goncalves (antonio.goncalves_at_gmail.com)
> Software architect
>
> Web site : www.antoniogoncalves.org
> Blog: agoncal.wordpress.com
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> LinkedIn: www.linkedin.com/in/agoncal