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Reproduce issue

Clone this repository and from the project root run:

./mvnw clean quarkus:dev

Sometimes it will compile successfully and start the application OK, othertimes it will give NPE due to kafkaStreams being null on class StreamMonitor, statement var metrics = kafkaStreams.metrics();.

Seems that sometimes KafkaStream instance is not injected at the correct time. Don't know if this is some CDI expected behaviour or is just a bug.

quarkus-kafka-streams-issue project

This project uses Quarkus, the Supersonic Subatomic Java Framework.

If you want to learn more about Quarkus, please visit its website: https://quarkus.io/ .

Running the application in dev mode

You can run your application in dev mode that enables live coding using:

./mvnw quarkus:dev

Packaging and running the application

The application can be packaged using ./mvnw package. It produces the quarkus-kafka-streams-issue-1.0-SNAPSHOT-runner.jar file in the /target directory. Be aware that it’s not an über-jar as the dependencies are copied into the target/lib directory.

The application is now runnable using java -jar target/quarkus-kafka-streams-issue-1.0-SNAPSHOT-runner.jar.

Creating a native executable

You can create a native executable using: ./mvnw package -Pnative.

Or, if you don't have GraalVM installed, you can run the native executable build in a container using: ./mvnw package -Pnative -Dquarkus.native.container-build=true.

You can then execute your native executable with: ./target/quarkus-kafka-streams-issue-1.0-SNAPSHOT-runner

If you want to learn more about building native executables, please consult https://quarkus.io/guides/building-native-image.