Quarkus 3.18.1 can't find config inner classes during @QuarkusTest tests

[Athou]

Describe the bug

I have a CommaFeedConfiguration configuration class. Quarkus 3.28.1 cannot find its inner classes during tests annotated with @QuarkusTest

java.lang.ClassNotFoundException: com.commafeed.CommaFeedConfiguration$HttpClientCache

Expected behavior

Tests pass as they did with Quarkus 3.26.4

Actual behavior

Here's the stacktrace during the maven build :

[ERROR] Tests run: 4, Failures: 0, Errors: 1, Skipped: 3, Time elapsed: 5.043 s <<< FAILURE! -- in com.commafeed.e2e.AuthentificationIT
[ERROR] com.commafeed.e2e.AuthentificationIT.registerSuccess -- Time elapsed: 0.005 s <<< ERROR!
java.lang.RuntimeException: java.lang.NoClassDefFoundError: com/commafeed/CommaFeedConfiguration$HttpClientCache
        at io.quarkus.test.junit.QuarkusTestExtension.throwBootFailureException(QuarkusTestExtension.java:666)
        at io.quarkus.test.junit.QuarkusTestExtension.interceptTestClassConstructor(QuarkusTestExtension.java:761)
        at java.base/java.util.Optional.orElseGet(Optional.java:364)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)
Caused by: java.lang.NoClassDefFoundError: com/commafeed/CommaFeedConfiguration$HttpClientCache
        at java.base/java.lang.ClassLoader.defineClass1(Native Method)
        at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:962)
        at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:566)
        at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:524)
        at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:577)
        at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:524)
        at io.quarkus.hibernate.validator.runtime.HibernateBeanValidationConfigValidatorBuilder.<clinit>(Unknown Source)
        at io.quarkus.runtime.generated.StaticInitConfig.configBuilder(Unknown Source)
        at io.quarkus.runtime.configuration.AbstractConfigBuilder.withCustomizer(AbstractConfigBuilder.java:117)
        at io.quarkus.runtime.generated.Config.<clinit>(Unknown Source)
        at io.quarkus.runner.ApplicationImpl.<clinit>(Unknown Source)
        at java.base/java.lang.Class.forName0(Native Method)
        at java.base/java.lang.Class.forName(Class.java:547)
        at io.quarkus.runner.bootstrap.StartupActionImpl.run(StartupActionImpl.java:334)
        at io.quarkus.test.junit.QuarkusTestExtension.doJavaStart(QuarkusTestExtension.java:232)
        at io.quarkus.test.junit.QuarkusTestExtension.ensureStarted(QuarkusTestExtension.java:640)
        at io.quarkus.test.junit.QuarkusTestExtension.beforeAll(QuarkusTestExtension.java:685)
        ... 1 more
        Suppressed: java.lang.NoClassDefFoundError: Could not initialize class io.quarkus.runtime.generated.Config
                at java.base/java.lang.Class.forName0(Native Method)
                at java.base/java.lang.Class.forName(Class.java:547)
                at io.quarkus.runner.bootstrap.StartupActionImpl.run(StartupActionImpl.java:338)
                ... 4 more
        Caused by: java.lang.ExceptionInInitializerError: Exception java.lang.NoClassDefFoundError: com/commafeed/CommaFeedConfiguration$HttpClientCache [in thread "main"]
                at java.base/java.lang.ClassLoader.defineClass1(Native Method)
                at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:962)
                at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:566)
                at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:524)
                at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:577)
                at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:524)
                at io.quarkus.hibernate.validator.runtime.HibernateBeanValidationConfigValidatorBuilder.<clinit>(Unknown Source)
                at io.quarkus.runtime.generated.StaticInitConfig.configBuilder(Unknown Source)
                at io.quarkus.runtime.configuration.AbstractConfigBuilder.withCustomizer(AbstractConfigBuilder.java:117)
                at io.quarkus.runtime.generated.Config.<clinit>(Unknown Source)
                at io.quarkus.runner.ApplicationImpl.<clinit>(Unknown Source)
                at java.base/java.lang.Class.forName0(Native Method)
                at java.base/java.lang.Class.forName(Class.java:547)
                at io.quarkus.runner.bootstrap.StartupActionImpl.run(StartupActionImpl.java:334)
                ... 4 more
Caused by: java.lang.ClassNotFoundException: com.commafeed.CommaFeedConfiguration$HttpClientCache
        at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:550)
        at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:524)
        ... 18 more

How to Reproduce?

Checkout this branch and run mvn clean install

Output of uname -a or ver

Microsoft Windows [Version 10.0.26100.6584]

Output of java -version

Java version: 17.0.11, vendor: Oracle Corporation

Quarkus version or git rev

3.28.1

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

Apache Maven 3.9.11

Additional information

No response

[quarkus-bot]

/cc @radcortez (config)

[geoand]

Did this work with previous Quarkus versions?

[Athou]

Did this work with previous Quarkus versions?

Yes, it works fine with 3.26.4.

[geoand]

Thanks for the update. Let's see what @radcortez says

[gsmet]

@Athou is it only failing in the test or also when you start the app?

[Athou]

@Athou is it only failing in the test or also when you start the app?

Only during tests, if I build the app with -DskipTests I'm able to start the app with java -jar target/quarkus-app/quarkus-run.jar.

[gsmet]

OK, so I guess we should probably ping @holly-cummins instead as I wouldn't be surprised it's an issue with test class loading.

[radcortez]

I'll have a look, but I don't remember tinkering with the config code in Quarkus recently that could cause this.

[radcortez]

Related to #49698. I'll submit a fix shortly.