spring-cloud-stream with functional programming - apache-kafka

Question

in my application kafka messages were consumed from multiple topics by streamlistner but i want to add functional consumer bean for one topic is this possible some topics consuming by streamlistner and some with consumer bean in same application?
when i tried topics were created only which are consumed by streamlistner but not for consumer bean?
application.yml
spring:
cloud:
function:
definition: printString
stream:
kafka:
binder:
brokers: localhost:9092
zkNodes: localhost:2181
autoCreateTopics: true
autoAddPartitions: true
bindings:
printString-in-0:
destination: function-input-topic
group: abc
consumer:
maxAttempts: 1
partitioned: true
concurrency: 2
xyz-input:
group: abc
destination: xyz-input-input
consumer:
maxAttempts: 1
partitioned: true
concurrency: 2
topic was created for xyz-input topic but not for function-input-topic
consumer bean
import java.util.function.Consumer;
#Component
public class xyz {
#Bean
Consumer<String> printString() {
return System.out::print;
}
}
kafkaConfig Interface
public interface KafkaConfig {
#Input("xyz-input")
SubscribableChannel inbound();
}

Answer 1

No, we tried in the past but there are subtle issues when the two programming modes collide. It is quite simple to factor out any StreamListener into a functional way (mostly removing code) and the app actually becomes much simpler.
Just get rid of KafkaConfig interface all together, get rid of #EnableBinding and you should be fine.