# Spring Kakfa 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 Messasge in group 'foo': Hello, World!<br> Received Messasge in group 'bar': Hello, World! #### Message received from the 'baeldung' topic, with the partition info >Received Messasge: 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 >Recieved Message in filtered listener: Hello Baeldung! #### Message (Serialized Java Object) received from the 'greeting' topic >Recieved greeting message: Greetings, World!!