Unable to override default CredentialsProvider

[SimonScholz]

When I try to override the com.google.api.gax.core.CredentialsProvider like this:

import com.google.api.gax.core.CredentialsProvider
import com.google.api.gax.core.NoCredentialsProvider
import io.quarkus.arc.profile.IfBuildProfile
import jakarta.enterprise.context.Dependent
import jakarta.enterprise.inject.Produces

@Dependent
class GcpConfig {

    @Produces
    @IfBuildProfile("dev")
    fun credentialsProvider(): CredentialsProvider {
        return NoCredentialsProvider.create()
    }
}

... I get the following exception:

 java.lang.RuntimeException: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
        [error]: Build step io.quarkus.arc.deployment.ArcProcessor#validate threw an exception: jakarta.enterprise.inject.spi.DeploymentException: jakarta.enterprise.inject.AmbiguousResolutionException: Ambiguous dependencies for type com.google.api.gax.core.CredentialsProvider and qualifiers [@Default]
        - injection target: io.quarkiverse.googlecloudservices.pubsub.QuarkusPubSub#credentialsProvider
        - declared on CLASS bean [types=[io.quarkiverse.googlecloudservices.pubsub.QuarkusPubSub, java.lang.Object], qualifiers=[@Default, @Any], target=io.quarkiverse.googlecloudservices.pubsub.QuarkusPubSub]
        - available beans:
                - PRODUCER METHOD bean [types=[java.lang.Object, com.google.api.gax.core.CredentialsProvider], qualifiers=[@Any, @Default], target=com.google.api.gax.core.CredentialsProvider credentialsProvider(), declaringBean=io.quarkiverse.googlecloudservices.common.GcpCredentialProviderProducer]
                - PRODUCER METHOD bean [types=[java.lang.Object, com.google.api.gax.core.CredentialsProvider], qualifiers=[@Default, @Any], target=com.google.api.gax.core.CredentialsProvider credentialsProvider(), declaringBean=gcp.GcpConfig]
        at io.quarkus.arc.processor.BeanDeployment.processErrors(BeanDeployment.java:1551)

IMHO the implemtation of GcpCredentialProviderProducer should use io.quarkus.arc.DefaultBean instead of jakarta.enterprise.inject.Default as depicted in this guide: https://quarkus.io/guides/cdi-reference#enable_build_profile

Also see

quarkus-google-cloud-services/common/runtime/src/main/java/io/quarkiverse/googlecloudservices/common/GcpCredentialProviderProducer.java

Line 20 in ca8a7a0

@Default

Otherwise I will not be able to specify my own CredentialsProvider, which I intend to use for my locally running pubsub emulator spinned up by docker compose.
What do you think?

[SimonScholz]

Okay I found out myself how to do it.

This code allows me to make use of the NoCredentialsProvider in my Quarkus application:

import com.google.api.gax.core.NoCredentialsProvider
import jakarta.annotation.Priority
import jakarta.enterprise.inject.Alternative
import jakarta.inject.Singleton

@Alternative
@Priority(1)
class GcpCredentialsProvider {
    @Singleton
    fun credentialsProvider() = NoCredentialsProvider.create()
}