Using @IfBuildProperty to selectively enable a bean seems to not work

[edeandrea]

I was trying to follow this guide - https://quarkus.io/guides/cdi-reference#enable_build_properties

I built this:

@Dependent
public class AstraConfig {
	private static final String ASTRA_SERVICE_IMPL_PROPERTY_NAME = "astra-service.type";

	@Produces
	@IfBuildProperty(name = ASTRA_SERVICE_IMPL_PROPERTY_NAME, stringValue = "cql-session", enableIfMissing = true)
	public AstraService cqlSessionAstraService() {
		return new CqlSessionAstraService();
	}

	@Produces
	@IfBuildProperty(name = ASTRA_SERVICE_IMPL_PROPERTY_NAME, stringValue = "dao")
	public AstraService mapperAstraService() {
		return new MapperAstraService();
	}
}

The classes CqlSessionAstraService and MapperAstraService implement the AstraService interface (an interface in my application). Neither class has any annotations on them. They do @Inject some things though.

public class CqlSessionAstraService implements AstraService {
	@Inject
	QuarkusCqlSession cqlSession;

        // Other methods

public class MapperAstraService implements AstraService {
	@Inject
	TodoItemDao todoItemDao;

	@Inject
	TodoMapper todoMapper;

        // Other methods

But when I try and build the app I get the following error. NOTE: I did try using @DefaultBean instead of @IfBuildProperty(name = ASTRA_SERVICE_IMPL_PROPERTY_NAME, stringValue = "cql-session", enableIfMissing = true) but that didn't change anything.

[ERROR] Failed to execute goal io.quarkus.platform:quarkus-maven-plugin:2.7.5.Final:build (default) on project quarkus-astra-intro-demo: Failed to build quarkus application: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
[ERROR]         [error]: Build step io.quarkus.arc.deployment.ArcProcessor#validate threw an exception: javax.enterprise.inject.spi.DeploymentException: javax.enterprise.inject.AmbiguousResolutionException: Ambiguous dependencies for type com.datastaxdev.todo.service.AstraService and qualifiers [@Default]
[ERROR]         - java member: com.datastaxdev.todo.AstraTODO#astraService
[ERROR]         - declared on CLASS bean [types=[java.lang.Object, com.datastaxdev.todo.AstraTODO], qualifiers=[@Default, @Any], target=com.datastaxdev.todo.AstraTODO]
[ERROR]         - available beans:
[ERROR]                 - CLASS bean [types=[com.datastaxdev.todo.service.AstraService, com.datastaxdev.todo.service.MapperAstraServiceImpl, java.lang.Object], qualifiers=[@Default, @Any], target=com.datastaxdev.todo.service.MapperAstraServiceImpl]
[ERROR]                 - CLASS bean [types=[com.datastaxdev.todo.service.AstraService, java.lang.Object, com.datastaxdev.todo.service.CqlSessionAstraService], qualifiers=[@Default, @Any], target=com.datastaxdev.todo.service.CqlSessionAstraService]
[ERROR]                 - PRODUCER METHOD bean [types=[com.datastaxdev.todo.service.AstraService, java.lang.Object], qualifiers=[@Default, @Any], target=com.datastaxdev.todo.service.AstraService cqlSessionAstraService(), declaringBean=com.datastaxdev.todo.config.AstraConfig]
[ERROR]         at io.quarkus.arc.processor.BeanDeployment.processErrors(BeanDeployment.java:1202)
[ERROR]         at io.quarkus.arc.processor.BeanDeployment.init(BeanDeployment.java:272)
[ERROR]         at io.quarkus.arc.processor.BeanProcessor.initialize(BeanProcessor.java:134)
[ERROR]         at io.quarkus.arc.deployment.ArcProcessor.validate(ArcProcessor.java:462)
[ERROR]         at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[ERROR]         at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[ERROR]         at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[ERROR]         at java.base/java.lang.reflect.Method.invoke(Method.java:566)
[ERROR]         at io.quarkus.deployment.ExtensionLoader$2.execute(ExtensionLoader.java:882)
[ERROR]         at io.quarkus.builder.BuildContext.run(BuildContext.java:277)
[ERROR]         at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
[ERROR]         at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2449)
[ERROR]         at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1478)
[ERROR]         at java.base/java.lang.Thread.run(Thread.java:829)
[ERROR]         at org.jboss.threads.JBossThread.run(JBossThread.java:501)
[ERROR] Caused by: javax.enterprise.inject.AmbiguousResolutionException: Ambiguous dependencies for type com.datastaxdev.todo.service.AstraService and qualifiers [@Default]
[ERROR]         - java member: com.datastaxdev.todo.AstraTODO#astraService
[ERROR]         - declared on CLASS bean [types=[java.lang.Object, com.datastaxdev.todo.AstraTODO], qualifiers=[@Default, @Any], target=com.datastaxdev.todo.AstraTODO]
[ERROR]         - available beans:
[ERROR]                 - CLASS bean [types=[com.datastaxdev.todo.service.AstraService, com.datastaxdev.todo.service.MapperAstraServiceImpl, java.lang.Object], qualifiers=[@Default, @Any], target=com.datastaxdev.todo.service.MapperAstraServiceImpl]
[ERROR]                 - CLASS bean [types=[com.datastaxdev.todo.service.AstraService, java.lang.Object, com.datastaxdev.todo.service.CqlSessionAstraService], qualifiers=[@Default, @Any], target=com.datastaxdev.todo.service.CqlSessionAstraService]
[ERROR]                 - PRODUCER METHOD bean [types=[com.datastaxdev.todo.service.AstraService, java.lang.Object], qualifiers=[@Default, @Any], target=com.datastaxdev.todo.service.AstraService cqlSessionAstraService(), declaringBean=com.datastaxdev.todo.config.AstraConfig]
[ERROR]         at io.quarkus.arc.processor.Beans.resolveInjectionPoint(Beans.java:437)
[ERROR]         at io.quarkus.arc.processor.BeanInfo.init(BeanInfo.java:524)
[ERROR]         at io.quarkus.arc.processor.BeanDeployment.init(BeanDeployment.java:260)
[ERROR]         ... 13 more

I also tried this - but same got the result:

@Dependent
public class AstraConfig {
	private static final String ASTRA_SERVICE_IMPL_PROPERTY_NAME = "astra-service.type";

	@Produces
	@IfBuildProperty(name = ASTRA_SERVICE_IMPL_PROPERTY_NAME, stringValue = "cql-session", enableIfMissing = true)
	public AstraService cqlSessionAstraService(QuarkusCqlSession cqlSession) {
		return new CqlSessionAstraService(cqlSession);
	}

	@Produces
	@IfBuildProperty(name = ASTRA_SERVICE_IMPL_PROPERTY_NAME, stringValue = "dao")
	public AstraService mapperAstraService(TodoItemDao todoItemDao, TodoMapper todoMapper) {
		return new MapperAstraService(todoItemDao, todoMapper);
	}
}

public class CqlSessionAstraService implements AstraService {
	private final QuarkusCqlSession cqlSession;

	public CqlSessionAstraService(QuarkusCqlSession cqlSession) {
		this.cqlSession = cqlSession;
	}

        // Other methods

public class MapperAstraService implements AstraService {
	private final TodoItemDao todoItemDao;
	private final TodoMapper todoMapper;

	public MapperAstraService(TodoItemDao todoItemDao, TodoMapper todoMapper) {
		this.todoItemDao = todoItemDao;
		this.todoMapper = todoMapper;
	}

        // Other methods

[edeandrea]

After some playing around with it I was able to get it to work using this:

@Dependent
public class AstraConfig {
	private static final String ASTRA_SERVICE_IMPL_PROPERTY_NAME = "astra-service.type";

	@Produces
	@ApplicationScoped
	@IfBuildProperty(name = ASTRA_SERVICE_IMPL_PROPERTY_NAME, stringValue = "cql-session", enableIfMissing = true)
	public AstraService cqlSessionAstraService(QuarkusCqlSession cqlSession) {
		return new CqlSessionAstraService(cqlSession);
	}

	@Produces
	@ApplicationScoped
	@IfBuildProperty(name = ASTRA_SERVICE_IMPL_PROPERTY_NAME, stringValue = "dao")
	public AstraService mapperAstraService(TodoItemDao todoItemDao, TodoMapper todoMapper) {
		return new MapperAstraService(todoItemDao, todoMapper);
	}
}

Seems you need to set the scope on the producer methods.

It also seems that the beans being created can't @Inject things within - meaning they need to use constructor injection.

I think the guide needs to be updated accordingly. Can someone please confirm this is the case?