Exception when disabling reactive messaging channel in configs

[mikethecalamity]

Describe the bug

When trying to disable a Reactive messaging channel using the provided config, there is a failure on startup that the emitter could not connect (see exception below).

mp.messaging.outgoing.<channel>.enabled=false

Quarkus should properly handle this config, since it is part of the Microprofile Messaging suite.

Expected behavior

Quarkus starts up successfully

Actual behavior

java.lang.RuntimeException: Failed to start quarkus
        at io.quarkus.runner.ApplicationImpl.doStart(Unknown Source)
        at io.quarkus.runtime.Application.start(Application.java:101)
        at io.quarkus.runtime.ApplicationLifecycleManager.run(ApplicationLifecycleManager.java:121)
        at io.quarkus.runtime.Quarkus.run(Quarkus.java:77)
        at io.quarkus.runtime.Quarkus.run(Quarkus.java:48)
        at io.quarkus.runtime.Quarkus.run(Quarkus.java:137)
        at io.quarkus.runner.GeneratedMain.main(Unknown Source)
        at io.quarkus.bootstrap.runner.QuarkusEntryPoint.doRun(QuarkusEntryPoint.java:68)
        at io.quarkus.bootstrap.runner.QuarkusEntryPoint.main(QuarkusEntryPoint.java:36)
Caused by: jakarta.enterprise.inject.spi.DefinitionException: SRMSG00019: Unable to connect an emitter with the channel `my-channel`
        at io.smallrye.reactive.messaging.providers.extension.ChannelProducer.getEmitter(ChannelProducer.java:225)
        at io.smallrye.reactive.messaging.providers.extension.ChannelProducer.produceEmitter(ChannelProducer.java:173)
        at io.smallrye.reactive.messaging.providers.extension.ChannelProducer_ProducerMethod_produceEmitter_jRfYFqSs8A2Ams_fdlkwttyVQ3w_Bean.doCreate(Unknown Source)
        at io.smallrye.reactive.messaging.providers.extension.ChannelProducer_ProducerMethod_produceEmitter_jRfYFqSs8A2Ams_fdlkwttyVQ3w_Bean.create(Unknown Source)
        at io.smallrye.reactive.messaging.providers.extension.ChannelProducer_ProducerMethod_produceEmitter_jRfYFqSs8A2Ams_fdlkwttyVQ3w_Bean.get(Unknown Source)
        at io.smallrye.reactive.messaging.providers.extension.ChannelProducer_ProducerMethod_produceEmitter_jRfYFqSs8A2Ams_fdlkwttyVQ3w_Bean.get(Unknown Source)
        at io.quarkus.arc.impl.CurrentInjectionPointProvider.get(CurrentInjectionPointProvider.java:48)

How to Reproduce?

Reeproducer

1. Add the config mp.messaging.outgoing.<channel>.enabled=false to a service using channels/emitters

Output of uname -a or ver

No response

Output of java -version

Eclipse Temurin JDK 17

Quarkus version or git rev

Quarkus 3.18.1

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

Gradle 8.12.1

Additional information

No response

[quarkus-bot]

/cc @cescoffier (reactive-messaging), @ozangunalp (reactive-messaging), @radcortez (config)

[cescoffier]

It is expected, because the graph cannot be closed. You need to disable the whole chain (incoming to outgoing).