Inject a EJB into JAX-RS (RESTfull service)

Question

I'm trying to inject Stateless EJB into my JAX-RS webservice via Annotations. Unfortunately the EJB is just null and I get a NullPointerException when I try to use it.

@Path("book")
public class BookResource {

    @EJB
    private BookEJB bookEJB;

    public BookResource() {
    }

    @GET
    @Produces("application/xml")
    @Path("/{bookId}")
    public Book getBookById(@PathParam("bookId") Integer id)
    {
        return bookEJB.findById(id);
    }
}

What am I wrong doing?

Here are some informations about my machine:

• Glassfish 3.1
• Netbeans 6.9 RC 2
• Java EE 6

Can you guys put some working example?

Answer 1

I am not sure this is supposed to work. So either:

Option 1: Use the injection provider SPI

Implement a provider that will do the lookup and inject the EJB. See:

• @EJB injection.

Option 2: Make the BookResource an EJB

@Stateless
@Path("book")
public class BookResource {

    @EJB
    private BookEJB bookEJB;

    //...
}

See:

• How to Combine REST Services with EJB 3.1
• EJB 3.1 And REST - The Lightweight Hybrid

Option 3: Use CDI

@Path("book")
@RequestScoped
public class BookResource {

    @Inject
    private BookEJB bookEJB;

    //...
}

See:

• Injecting an EJB from a jar into a jax-rs class in a war