2019-10-31 21:43:47 -04:00
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## Spring Kafka
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This module contains articles about Spring with Kafka
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### Relevant articles
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- [Intro to Apache Kafka with Spring](https://www.baeldung.com/spring-kafka)
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2020-11-18 03:57:40 -05:00
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- [Testing Kafka and Spring Boot](https://www.baeldung.com/spring-boot-kafka-testing)
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2021-07-01 17:33:10 -04:00
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- [Monitor the Consumer Lag in Apache Kafka](https://www.baeldung.com/java-kafka-consumer-lag)
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2021-07-07 11:29:24 -04:00
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- [Send Large Messages With Kafka](https://www.baeldung.com/java-kafka-send-large-message)
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2019-10-31 21:43:47 -04:00
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### Intro
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This is a simple Spring Boot app to demonstrate sending and receiving of messages in Kafka using spring-kafka.
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As Kafka topics are not created automatically by default, this application requires that you create the following topics manually.
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`$ bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic baeldung`<br>
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`$ bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 5 --topic partitioned`<br>
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`$ bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic filtered`<br>
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`$ bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic greeting`<br>
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When the application runs successfully, following output is logged on to console (along with spring logs):
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#### Message received from the 'baeldung' topic by the basic listeners with groups foo and bar
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>Received Message in group 'foo': Hello, World!<br>
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Received Message in group 'bar': Hello, World!
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#### Message received from the 'baeldung' topic, with the partition info
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>Received Message: Hello, World! from partition: 0
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#### Message received from the 'partitioned' topic, only from specific partitions
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>Received Message: Hello To Partioned Topic! from partition: 0<br>
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Received Message: Hello To Partioned Topic! from partition: 3
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#### Message received from the 'filtered' topic after filtering
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>Received Message in filtered listener: Hello Baeldung!
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#### Message (Serialized Java Object) received from the 'greeting' topic
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>Received greeting message: Greetings, World!!
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