bean-discovery-mode="annotated" and Producers/Observers in
Project: CDI Specification Issues
Issue Type: Clarification
Reporter: Jens Schumann
Assignee: Antoine Sabot-Durand
Fix For: 1.2 Proposed
Right now bean-discovery-mode="annotated" skips beans that are not annotated
with an bean-defining annotation even if they contain an observer method or producer
method/field. I would not recommend having (not annotated) @Dependent beans with @Observes
or @Produces - I just had them by accident while playing around with Wildfly.
However there are two impacts:
1. Someone might be confused by ignored @Producer's. Not a major issue here, the CDI
runtime will report it. We could optionally document the behavior in the spec, so it's
clear to everyone. However I think it's inconsistent, since @Produces may contain a
scope (and has a default scope too). Therefore I would vote for @Produces support in
bean-discovery-mode="annotated". Of course the enclosing class is not a managed
bean that may be injected somewhere.
2. Since Observer methods in "not annotated" beans fail silently this can be a
major issue for applications, especially if you migrate from CDI 1.0 (CDI 1.0 source code
and CDI 1.0 thinking model). Therefore I believe @Observer methods have to be included in
bean-discovery-mode="annotated" even if the enclosing bean does not have a
bean-defining annotation. Of course the enclosing class is not a managed bean that may be
I understand that the proposal above might have negative impacts on class scanning
performance in bean-discovery-mode="annotated". However silently failing
@Observes can be a major cause of defects that have to be treated because of technical and
political reasons. Technical - because it may cause bugs. And political - because in my
experience many people are still skeptical that CDI events are a trustworthy
achievement. Possibly skipped observer methods won't make live easier.
If you believe the proposal would kill the original intent of
bean-discovery-mode="annotated" please document the impact for Producers and
Observers in the spec and even in the XSD.
 I have trained a couple hundred people in using CDI and CDI events. And every time I
have to argument against the uncertainty on event delivery: "How do I know which
observers are active?", "Who ensures that event's are delivered?"... I
personally LOVE events;)
Btw: Which JIRA version is CDI 1.1 Final?
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