将@ViewScope cdi bean注入JAX-RS资源

Question

I'm using MyFaces Apache 2.0.3 JSF, WAS 8.0.0.10

Currently I'm trying to inject an @ViewScope cdi bean, @ViewScope in JSF 2.0 provided by OmniFaces 's library. But I get an error: WebBeans context with scope type annotation @ViewScoped does not exist within current thread . When I try to inject an @SessionScope cdi bean, everything works fine.

Code of my JAX-RS resource:

@RequestScoped
@Path("/events")
public class CalendarResource implements Serializable {     
    @Inject
    private CalendarBean calendarBean;
    @Inject
    private PropertiesBean propertiesBean;

    @GET
    @Produces("text/plain; charset=utf-8")
    public Response getEvents(@QueryParam("calendarId") String calendarId,
                            @QueryParam("start") String start,
                            @QueryParam("end") String end,
                            @Context SecurityContext securityContext,
                            @Context HttpServletRequest req
                            ) {


        FullCalendar selectedCalendar = calendarBean.getFullCalendar();


        System.out.println(calendarId + " " + start + " " + end + " " + propertiesBean.getUser().getName());


        return null;

    }

Code of my CDI bean:

@Named
@ViewScoped
public class CalendarBean implements Serializable {


    @EJB
    private CalendarEJB calendarEJB;

    @Inject
    private PropertiesBean propertiesBean;



    @PostConstruct
    public void init(){
        ...
    }

...
}

What am I doing wrong? As soon as I know, I can inject broader scope in a narrow scope. Thank you.

UPDATE : when I changed @ViewScope to @SessionScoped , everything began to work. May it be issue with OmniFaces ?

Answer 1

@ViewScoped is tied to a JSF view, however durig a JAX-RS request, there's no means of a JSF view anywhere. There's no JSF view being restored during a JAX-RS request as the JAX-RS request is not initiated by submit of a JSF <h:form> which holds information about the JSF view state and would trigger the FacesServlet to restore the view.

@SessionScoped will indeed work if the JAX-RS request is fired in the same HTTP session as the JSF page. However I can understand that this scope is too broad. You might want to pass an additional request parameter identifying the current JSF view and get hold a mapping of it in the session scoped bean (which is basically how the JSF view scope works under the covers!).

@ConversationScoped should work if you pass along the cid parameter to the JAX-RS request.

This is not an OmniFaces problem. You'd face exactly the same problem with JSF 2.2 @ViewScoped due to the nature of it being tied to a JSF view.