[cdi-dev] WithAnnotations with ProcessInjectionTarget events

John D. Ament john.d.ament at gmail.com
Fri Aug 14 09:17:16 EDT 2015

Hi Nigel,

Maybe you meant to send this to weld-dev, since its a problem with one of
the CDI impls, not cdi-dev?

Sure, there's some spec enhancement listed here, but realistically
WithAnnotations doesn't apply to an injection target the same way (I
wouldn't think).


On Fri, Aug 14, 2015 at 8:02 AM Nigel Deakin <nigel.deakin at oracle.com>

> I'm writing a portable extension, and my Extension class includes the
> following observer method
>    public <X> void processInjectionTarget(
>        @Observes ProcessInjectionTarget<X> event) {
> When I start the server (Glassfish) I see this warning in the log:
>    WELD-000411: Observer method [BackedAnnotatedMethod] public
> com.foo.MyExtension.processAnnotatedType(@Observes
> ProcessAnnotatedType<Object>) receives events for all annotated types.
> Consider restricting events using
> @WithAnnotations or a generic type with bounds.]]
> I thought "OK, fair enough. I only want to receive ProcessInjectionTarget
> events for classes that have a specific
> annotation. So I'll do what it suggests and @WithAnnotations to restrict
> the events received."
> However if I look up the javadocs for WithAnnotations it says
> "WithAnnotations may be applied to any portable extension
> observer method with an event parameter type of ProcessAnnotatedType to
> filter the events delivered."
> And if I try using WithAnnotations on the above method, I indeed get an
> error at runtime.
> So the warning message WELD-000411 is incorrect, since it suggests doing
> something that is not allowed.
> @WithAnnotations would have been perfect for my needs. Why is it not
> allowed when observing ProcessInjectionTarget events?
> So it looks as if I will simply have to receive every such event and check
> whether it has the required annotation:
>    public <X> void processInjectionTarget(
>        @Observes ProcessInjectionTarget<X> event) {
>       if
> (!event.getAnnotatedType().isAnnotationPresent(MyAnnotation.class)) {
>          return;
>      }
> This doesn't look very efficient to me, since there will be a lot of
> irrelevant events. Is there a better way?
> Nigel
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