quarkus-grpc: Generate proto files from dependencies no longer works since Quarkus 3.16

[mschorsch]

Describe the bug

Since Quarkus 3.16, the generation of proto files from dependencies (https://quarkus.io/guides/grpc-generation-reference#scan-for-proto) no longer works and fails with the following error:

...
Failed to index org.acme.proto.Greeter: Class does not exist in ClassLoader QuarkusClassLoader:Deployment Class Loader: PROD for server-1.0.0-SNAPSHOT@6926d1c4
> Task :server:quarkusAppPartsBuild FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':server:quarkusAppPartsBuild'.
> There was a failure while executing work items
   > A failure occurred while executing io.quarkus.gradle.tasks.worker.BuildWorker
      > io.quarkus.builder.BuildException: Build failure: Build failed due to errors
                [error]: Build step io.quarkus.grpc.deployment.GrpcClientProcessor#discoverInjectedClients threw an exception: java.lang.NullPointerException: Cannot invoke "org.jboss.jandex.ClassInfo.name()" because "classInfo" is null
                at io.quarkus.grpc.deployment.GrpcClientProcessor.getRawTypeClosure(GrpcClientProcessor.java:468)
                at io.quarkus.grpc.deployment.GrpcClientProcessor.discoverInjectedClients(GrpcClientProcessor.java:189)
                at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:733)
                at io.quarkus.deployment.ExtensionLoader$3.execute(ExtensionLoader.java:856)
                at io.quarkus.builder.BuildContext.run(BuildContext.java:256)
                at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
                at org.jboss.threads.EnhancedQueueExecutor$Task.doRunWith(EnhancedQueueExecutor.java:2675)
                at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2654)
                at org.jboss.threads.EnhancedQueueExecutor.runThreadBody(EnhancedQueueExecutor.java:1627)
                at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1594)
                at java.base/java.lang.Thread.run(Thread.java:1583)
                at org.jboss.threads.JBossThread.run(JBossThread.java:499)
...

Expected behavior

No response

Actual behavior

No response

How to Reproduce?

1. reproducer.zip
2. ./gradlew clean && rm -rf .gradle/ && ./gradlew --stop && ./gradlew clean build --rerun-tasks --no-build-cache --no-parallel --console=plain

Output of uname -a or ver

No response

Output of java -version

Java 21

Quarkus version or git rev

3.16.1

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

Gradle 8.10.2

Additional information

No response

[quarkus-bot]

/cc @alesj (grpc), @cescoffier (grpc)

[mschorsch]

All versions from Quarkus 3.16.0 onwards are affected, including the latest version 3.16.2.

[cescoffier]

I think something changed in our gradle support.

[geoand]

cc @aloubyansky

[mafa73]

I have a similar issue with generated classes from protobuf that is used in reactive messaging when migrating to 3.16.x from 3.15.1:

`What went wrong:
Execution failed for task ':quarkusAppPartsBuild'.

There was a failure while executing work items
A failure occurred while executing io.quarkus.gradle.tasks.worker.BuildWorker
> io.quarkus.builder.BuildException: Build failure: Build failed due to errors
[error]: Build step io.quarkus.smallrye.reactivemessaging.deployment.SmallRyeReactiveMessagingProcessor#build threw an exception: java.lang.IllegalStateException: java.lang.ClassNotFoundException: com.mycompany.user.kafkamodel.proto.TransferWorkitemOuterClass$TransferWorkitem
at io.quarkus.smallrye.reactivemessaging.deployment.QuarkusMediatorConfigurationUtil.load(QuarkusMediatorConfigurationUtil.java:315)
at io.quarkus.smallrye.reactivemessaging.deployment.QuarkusMediatorConfigurationUtil$JandexGenericTypeAssignable.getType(QuarkusMediatorConfigurationUtil.java:400)
at io.quarkus.smallrye.reactivemessaging.deployment.QuarkusMediatorConfigurationUtil$MethodParamGenericTypeAssignable.getType(QuarkusMediatorConfigurationUtil.java:454)
at io.smallrye.reactive.messaging.providers.MediatorConfigurationSupport.validateSubscriber(MediatorConfigurationSupport.java:164)
at io.smallrye.reactive.messaging.providers.MediatorConfigurationSupport.validate(MediatorConfigurationSupport.java:97)
at io.quarkus.smallrye.reactivemessaging.deployment.QuarkusMediatorConfigurationUtil.create(QuarkusMediatorConfigurationUtil.java:140)
at io.quarkus.smallrye.reactivemessaging.deployment.SmallRyeReactiveMessagingProcessor.build(SmallRyeReactiveMessagingProcessor.java:310)
at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:733)
at io.quarkus.deployment.ExtensionLoader$3.execute(ExtensionLoader.java:856)
at io.quarkus.builder.BuildContext.run(BuildContext.java:256)
at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
at org.jboss.threads.EnhancedQueueExecutor$Task.doRunWith(EnhancedQueueExecutor.java:2675)
at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2654)
at org.jboss.threads.EnhancedQueueExecutor.runThreadBody(EnhancedQueueExecutor.java:1627)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1594)
at java.base/java.lang.Thread.run(Thread.java:1583)
at org.jboss.threads.JBossThread.run(JBossThread.java:499)
Caused by: java.lang.ClassNotFoundException: com.mycompany.user.kafkamodel.proto.TransferWorkitemOuterClass$TransferWorkitem
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:593)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:569)
at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:517)
at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:569)
at io.quarkus.bootstrap.classloading.QuarkusClassLoader.loadClass(QuarkusClassLoader.java:517)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:534)
at java.base/java.lang.Class.forName(Class.java:513)
at io.quarkus.smallrye.reactivemessaging.deployment.QuarkusMediatorConfigurationUtil.load(QuarkusMediatorConfigurationUtil.java:313)
... 16 more`

[cdsap]

Hi, sorry for the inconvenience. In version 3.16.1, we updated the QuarkusBuildTask configuration to make it compatible with the configuration cache. These changes required adjustments in how we configure tasks.

In this specific case, the issue is that, during the initial build of the application model in a completely fresh environment (using /gradlew clean && rm -rf .gradle/ && ./gradlew --stop && ./gradlew clean build --rerun-tasks --no-build-cache --no-parallel), the Java compile task does not include the destination output of the gRPC task in its source set. Since we initialize the project descriptor during the configuration phase, the Java compile task does not recognize the gRPC outputs.

To demonstrate this behavior, you can add a Java class in the server module, and you will observe that the issue does not occur because Java compilation can then process the output correctly.

I’ve prepared a quick fix that I need to validate with the Quarkus team.

[mschorsch]

Thanks @cdsap