java-tutorials/spring-kafka/README.md

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## Spring Kafka
This module contains articles about Spring with Kafka
### Relevant articles
- [Intro to Apache Kafka with Spring](https://www.baeldung.com/spring-kafka)
- [Testing Kafka and Spring Boot](https://www.baeldung.com/spring-boot-kafka-testing)
- [Monitor the Consumer Lag in Apache Kafka](https://www.baeldung.com/java-kafka-consumer-lag)
- [Send Large Messages With Kafka](https://www.baeldung.com/java-kafka-send-large-message)
- [Configuring Kafka SSL Using Spring Boot](https://www.baeldung.com/spring-boot-kafka-ssl)
- [Kafka Streams With Spring Boot](https://www.baeldung.com/spring-boot-kafka-streams)
- [Get the Number of Messages in an Apache Kafka Topic](https://www.baeldung.com/java-kafka-count-topic-messages)
### Intro
This is a simple Spring Boot app to demonstrate sending and receiving of messages in Kafka using spring-kafka.
As Kafka topics are not created automatically by default, this application requires that you create the following topics manually.
`$ bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic baeldung`<br>
`$ bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 5 --topic partitioned`<br>
`$ bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic filtered`<br>
`$ bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic greeting`<br>
When the application runs successfully, following output is logged on to console (along with spring logs):
#### Message received from the 'baeldung' topic by the basic listeners with groups foo and bar
>Received Message in group 'foo': Hello, World!<br>
Received Message in group 'bar': Hello, World!
#### Message received from the 'baeldung' topic, with the partition info
>Received Message: Hello, World! from partition: 0
#### Message received from the 'partitioned' topic, only from specific partitions
>Received Message: Hello To Partioned Topic! from partition: 0<br>
Received Message: Hello To Partioned Topic! from partition: 3
#### Message received from the 'filtered' topic after filtering
>Received Message in filtered listener: Hello Baeldung!
#### Message (Serialized Java Object) received from the 'greeting' topic
>Received greeting message: Greetings, World!!