Go to the root of the repository.
Make sure you have Kafka broker running. The application expects it to be on defaults (localhost:9092). If thats not the case, change the configuration.
./mvnw clean package
Start the application preferrably in an IDE.
Set a breakpoint on KStreamBinder method doBindProducer and examine the extended producer properties object. Verify that you are seeing the topic level properties (which is the issue reported by spring-attic/spring-cloud-stream-binder-kafka#684).