quarkus-maven-plugin:build keeps stale classloaders

As of Quarkus 1.11.0.Final, the build mojo of quarkus-maven-plugin keeps stale class loaders of deployment artifacts built from the same source tree with the same daemon.

Generic steps to reproduce:

1. Find some simple itest in the quarkus, e.g. jsonb
2. Break something in some deployment module used by the test, e.g. fully remove the body of io.quarkus.jsonb.deployment.JsonbProcessor.build(BuildProducer<ReflectiveClassBuildItem>, BuildProducer<NativeImageResourceBundleBuildItem>, BuildProducer<ServiceProviderBuildItem>, BuildProducer<AdditionalBeanBuildItem>, CombinedIndexBuildItem) method.
3. Rebuild quarkus-jsonb-deployment to make sure that it is installed
4. Build the test with a fresh mvnd

cd integration-tests/jsonb
mvnd --stop
mvnd clean verify -Dnative

The test should fail, because the JsonbProcessor is broken 5. Revert the breakage in io.quarkus.jsonb.deployment.JsonbProcessor.build(BuildProducer<ReflectiveClassBuildItem>, BuildProducer<NativeImageResourceBundleBuildItem>, BuildProducer<ServiceProviderBuildItem>, BuildProducer<AdditionalBeanBuildItem>, CombinedIndexBuildItem) method, 6. Rebuild quarkus-jsonb-deployment with mvnd to make sure that it is installed 7. Rebuild the test project

cd integration-tests/jsonb
mvnd --stop
mvnd clean verify -Dnative

Expected: the test should pass, because the JsonbProcessor is fixed now Actual: the test still fails, because the quarkus-maven-plugin classloader is cached and it contains an outdated version of JsonbProcessor

Workaround: manually kill the daemon when any of the deployment modules was changed.

[famod]

@ppalaga So would you suggest to stop using mvnd for Quarkus for now?

What if mvnd had a blacklist of plugins that must not be cached? This might be a workaround for plugins that are known to cause trouble and take some time to be adjusted?

[gnodet]

@ppalaga I can’t reproduce with quarkus master and mvnd 0.3.0. The changes seem to be correctly picked up by the daemon when running the test after rebuilding the deployment module.