Retrieving dependencies from CDI in tests that implement interface throws java.lang.IllegalStateException if code defined outside JUnit test

Describe the bug When attempting to inject a dependency that implements an interface, if you use the class rather than the interface it throws a java.lang.IllegalStateException whereas using the interface is fine.

This only seems to be an issue if you try to make a “helper” method that lives outside of a @Test function.

This is also not a problem if you’re injecting a class that doesn’t implement an interface.

Expected behavior You should be able to inject either the interface or a specific implementation, and creating a helper method outside of a JUnit test should be fine for either.

Actual behavior I have an interface called TestInterface, and an implementation called TestInterfaceImpl and the TestInterfaceImpl is annotated with @ApplicationScoped.

I have a series of tests that inject this dependency in order to call various methods on the dependency, using the context for the rest of the DI. If I attempt to retrieve the dependency within a JUnit test (annotated with @Test) then both of these methods work:

    @Test
    fun testOne() {
        val dep = CDI.current().select(TestInterface::class.java).get()
    	
		// Do some stuff - this works
    }

    @Test
    fun testTwo() {
        val dep = CDI.current().select(TestInterfaceImpl::class.java).get()
    	
		// Do some stuff - this works
    }

I have ended up repeating this across all of my tests, so wanted to take this out to a helper function. This sits within the class, but is not part of any @Test function:

	private fun getDependency() = CDI.current().select(TestInterface::class.java).get()

    @Test
    fun testThree() {
        val dep = getDependency()
    	
		// Do some stuff - this works
    }

This above function is fine, but the following does not work and results in the below stack trace.

	private fun getDependency() = CDI.current().select(TestInterfaceImpl::class.java).get()

    @Test
    fun testFour() {
        val dep = getDependency()
    	
		// This doesn't work :(
    }

Stack trace:

Caused by: java.lang.NoSuchMethodError: com.example.TestInterfaceImpl: method <init>()V not found
	at com.example.TestInterfaceImpl_ClientProxy.<init>(EngineerSummaryServiceImpl_ClientProxy.zig:21)
	at com.example.TestInterfaceImpl_Bean.<init>(EngineerSummaryServiceImpl_Bean.zig:118)
	at io.quarkus.arc.setup.Default_ComponentsProvider.addBeans2(Default_ComponentsProvider.zig:1140)
	at io.quarkus.arc.setup.Default_ComponentsProvider.getComponents(Default_ComponentsProvider.zig:43)
	at io.quarkus.arc.impl.ArcContainerImpl.<init>(ArcContainerImpl.java:102)
	at io.quarkus.arc.Arc.initialize(Arc.java:20)
	... 82 more

Unable to locate CDIProvider
java.lang.IllegalStateException: Unable to locate CDIProvider
	at javax.enterprise.inject.spi.CDI.findAllProviders(CDI.java:121)
	at javax.enterprise.inject.spi.CDI.getCDIProvider(CDI.java:82)
	at javax.enterprise.inject.spi.CDI.current(CDI.java:64)
    ...

This is also not a problem if you’re injecting a class that doesn’t implement an interface.

To Reproduce Here’s a reproducer: https://github.com/bnjns/quarkus-bug-7541

Just run

$ ./gradlew clean test

Configuration N/A

Screenshots N/A

Environment (please complete the following information):

• Output of uname -a or ver: Darwin Beans.local 19.3.0 Darwin Kernel Version 19.3.0: Thu Jan 9 20:58:23 PST 2020; root:xnu-6153.81.5~1/RELEASE_X86_64 x86_64
• Output of java -version: openjdk version “1.8.0_232”
• GraalVM version (if different from Java): GraalVM CE 19.2.1 (build 25.232-b07-jvmci-19.2-b03, mixed mode)
• Quarkus version or git rev: 1.2.1.Final

Additional context Using Kotlin 1.3.61, compiled down to Java 1.8 Using Gradle (6.0.1)