Synthetic bean creating using generics doesn't seem to work.

[jelmew]

Hi all,

I'm trying to use generics in synthetic bean creation.

I create a List<Class<?>> Using the following

syntheticBeanProducer.produce( SyntheticBeanBuildItem.configure(List.class) .scope(Singleton.class) .addType(com.crv.jms.Util.createType()) .unremovable() .addQualifier().annotation(Identifier.class).addValue("value", name).done() .createWith( recorder.createSupportedEventTypesList(supportedEventTypes)) .unremovable() .done());
And then specify its need in another syntheticBeanProducer

syntheticBeanProducer.produce( SyntheticBeanBuildItem.configure(EventProducer.class) .addType(EventProducer.class) .scope(Singleton.class) .setRuntimeInit() .addInjectionPoint( com.crv.jms.Util.createType(), AnnotationInstance.builder(Identifier.class).add("value", name).build()) .addQualifier().annotation(Identifier.class).addValue("value", name).done() .createWith(recorder.createParallelEventProducer(name, topicName)) .unremovable() .done());

I would suspect that this would work. however it just gives the error.

[ERROR] HealthCheckTest.testHealth » Runtime 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.UnsatisfiedResolutionException: Unsatisfied dependency for type java.util.List<java.lang.Class<?>> and qualifiers [@io.smallrye.common.annotation.Identifier("test")]
- synthetic injection point
- declared on SYNTHETIC bean [types=[java.lang.Object, com.crv.jms.EventProducer], qualifiers=[@Any, @io.smallrye.common.annotation.Identifier("test")], target=n/a]
The following beans match by type, but none has matching qualifiers:
- PRODUCER METHOD bean [types=[java.util.List, java.lang.Object], qualifiers=[@Any, @ConfigProperty], target=java.util.List producesListConfigProperty(jakarta.enterprise.inject.spi.InjectionPoint ip), declaringBean=io.smallrye.config.inject.ConfigProducer]

I am suspecting that something is wrong during the generation of the List<Class<?>>. Does anyone have any insights?

Kind regards,
Jelmer

[jelmew]

Here is a reproducer.
https://github.com/jelmew/example_generic_problems

[mkouba]

Hi @jelmew, the List<Class<?>> is not a legal bean type, according to the spec and that's why the resolution fails. The truth is we should validate all bean types added to a synthetic bean and fail fast, when an invalid bean type is being registered.

[mkouba]

I've created #46771 to track this issue.

[Ladicek]

I actually responsed to this exact question on StackOverflow, but took it from the opposing angle: the synth bean is not assignable to the injection point, because of the typesafe resolution rules :-) I didn't even bother looking into if the bean types are legal. Validation is certainly a good idea!

[jelmew]

Hi,

Well, good to know, that saves me some more hours overthinking.
@Ladicek , thanks for answering on StackOverflow

It would be good to fail fast, because most people don't know the spec by heart.