spring-boot-kafka. In this article, we will be using spring boot 2 feature to develop a sample Kafka subscriber and producer application.We will take a look at the use of KafkaTemplate to send messages to Kafka topics,@KafkaListener annotation to listen to those messages and @SendTo annotation to forward messages to a specified topic.We will also take a look at how to produce messages to multiple partitions of a single topic and how those messages are consumed by a consumer group along with custom message converters in spring boot.