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Apache Kafka example for Spring Boot

Example code for connecting to a Apache Kafka cluster and authenticate with SASL/SCRAM based on https://github.com/spring-projects/spring-boot/tree/master/spring-boot-samples/spring-boot-sample-kafka

To quickly test this example you can create a free Apache Kafka instance at https://www.cloudkarafka.com

Running locally

If you just want to test it out.

Configure

All of the authentication settings can be found in the Details page for your CloudKarafka instance.

You configure Spring boot in the application.properties file, here you set the brokers to connect to and the credentials for authentication.

Here is an example of the properties file

spring.kafka.bootstrap-servers=${CLOUDKARAFKA_BROKERS:velomobile-01.srvs.cloudkafka.com:9094,velomobile-02.srvs.cloudkafka.com:9094,velomobile-03.srvs.cloudkafka.com:9094}
spring.kafka.properties.security.protocol=SASL_SSL
spring.kafka.properties.sasl.mechanism=SCRAM-SHA-256
spring.kafka.properties.sasl.jaas.config=org.apache.kafka.common.security.scram.ScramLoginModule required username="${CLOUDKARAFKA_USERNAME}" password="${CLOUDKARAFKA_PASSWORD}";
spring.kafka.consumer.group-id=${CLOUDKARAFKA_USERNAME}-consumers

spring.kafka.consumer.auto-offset-reset=latest
spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.consumer.properties.spring.json.trusted.packages=sample.kafka

cloudkarafka.topic=${CLOUDKARAFKA_USERNAME}-default

CLOUDKARAFKA_BROKERS should be a comma-separated list of all the brokers, the URL must include the port, for example:

velomobile-01.srvs.cloudkafka.com:9094,velomobile-02.srvs.cloudkafka.com:9094,velomobile-03.srvs.cloudkafka.com:9094

Please note that prefixing the topic name and consumer group id is only necessary if your broker is hosted on CloudKarafka on Developer Duck plan, this is because on the Developer Duck plan your instance is running on a shared broker. If you are running a dedicated plan on CloudKarafka or have your own server, you can use any value for both of the properties

Run

git clone https://github.com/CloudKarafka/springboot-kafka-example.git
cd springboot-kafka-example
mvn spring-boot:run -DCLOUDKARAFKA_USERNAME=<USERNAME> -DCLOUDKARAFKA_PASSWORD=<PASSWORD> -DCLOUDKARAFKA_BROKERS=<BROKERS>

It will first produce 20 messages and then start the consumer which will print out the messages.