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