Spring Kafka test example

Spring Kafka example with JUnit 5 using EmbeddedKafka/spring-kafka-test and also using Testcontainers.

For the tutorials check the links below,

• Test Spring Kafka consumer and producer with EmbeddedKafka
• Write Kafka integration test with Testcontainers
• Database migration with Spring Boot and Flyway
• Spring Boot MySQL integration tests with Testcontainers
• Spring Boot Swagger documentation using OpenAPI
• Disable Springdoc OpenAPI Swagger in production
• How to hide an endpoint in Springdoc OpenAPI

How to run

First start the docker-compose which contains ZooKeeper, Kafka, Kafdrop, and MySQL.

$ docker-compose -f docker-compose.yml up -d

Once all the containers are healthy start the application,

$ ./mvnw spring-boot:run

Open the browser localhost:8080/apidocs.

You can interact with the random API to create a random user which then will be sent to Kafka and consumed by the consumer (see consumer/UserKafkaListener.java file) and finally saves into the database.

To see whether the message has been sent to Kafka, open your browser http://localhost:8085/topic/com.madadipouya.kafka.use (Kafdrop environment), you should be able to see all messages that sent to kafka.user topic.

To run Flyway migration scripts only run,

$ ./mvnw flyway:migrate