CDI events qualifiers not working when abstract superclass is in a library

Describe the bug

CDI events qualifiers are not working well when abstract superclass is in a library since when implementing the class it will be registered as a general observer instead of one with a qualifier. Check https://github.com/MarcoMartins86/event_qualifier_issue for more details.

Expected behavior

If I trigger an important event http://localhost:8080/Events/Important should appear:

Library AbstractObserverImportantEvent: Important event message 0 Event qualifiers[[@org.acme.ImportantEvent(), @javax.enterprise.inject.Any()]]
Runner ImportantEventImpl: Important event message 0

Actual behavior

If I trigger an important event http://localhost:8080/Events/Important appears:

Library AbstractObserverNormalEvent: Important event message 0 Event qualifiers[[@org.acme.ImportantEvent(), @javax.enterprise.inject.Any()]]
Runner NormalEventImpl: Important event message 0
Library AbstractObserverImportantEvent: Important event message 0 Event qualifiers[[@org.acme.ImportantEvent(), @javax.enterprise.inject.Any()]]
Runner ImportantEventImpl: Important event message 0

To Reproduce

A project that reproduces this https://github.com/MarcoMartins86/event_qualifier_issue

Steps to reproduce the behavior:

1. make
2. Do GET to http://localhost:8080/Events/Important
3. Check the command line for the prints

Environment (please complete the following information):

Output of uname -a or ver

Darwin PT-320323-MBP16 20.2.0 Darwin Kernel Version 20.2.0: Wed Dec 2 20:39:59 PST 2020; root:xnu-7195.60.75~1/RELEASE_X86_64 x86_64

Output of java -version

java version “11.0.9” 2020-10-20 LTS Java™ SE Runtime Environment 18.9 (build 11.0.9+7-LTS) Java HotSpot™ 64-Bit Server VM 18.9 (build 11.0.9+7-LTS, mixed mode)

GraalVM version (if different from Java)

Quarkus version or git rev

1.12.2.Final

Build tool (ie. output of mvnw --version or gradlew --version)

Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f) Maven home: /usr/local/Cellar/maven/3.6.3_1/libexec Java version: 11.0.9, vendor: Oracle Corporation, runtime: /Library/Java/JavaVirtualMachines/jdk-11.0.9.jdk/Contents/Home Default locale: en_PT, platform encoding: UTF-8 OS name: “mac os x”, version: “10.16”, arch: “x86_64”, family: “mac”

Additional context

[mkouba]

I can confirm that it’s a bug.

The Jandex MethodParameterInfo does not implement equals()/hashCode() and for some reason we receive two distinct target instances for the @Observes and @NormalEvent annotations declared on the event param of AbstractObserverNormalEvent.observer().

I’ll prepare a fix next Monday.

[mkouba]

@MarcoMartins86 FYI the problem only occurs if an observer method is declared on a class located in an archive with a pregenerated Jandex index (e.g. via the jandex-maven-plugin).