What are KafkaListener Annotation Properties?

@KafkaListener annotation allows you to configure underlying consumer like so...

@Component
public class Listener {
    @KafkaListener(properties = {"bootstrap.servers=localhost:9092"}, id = "foo", topics = "myTopic")
    public void listen(String data) {
        System.out.println(data);
    }
}

Notice how you can set things like topics and consumerGroupId as well as underlying consumer properties via the properties = {}...

properties that allow you to configure the consumer that you are really setting up under the hood when you use such annotations :)