Simple embedded Kafka test example with spring boot

Simple embedded Kafka test example with spring boot

To create a simple embedded Kafka test example with Spring Boot, you can use the spring-kafka-test library, which provides support for testing Kafka-based applications. Here's a basic example:

  1. Add Dependencies: First, you need to add the necessary dependencies to your pom.xml or build.gradle file.

For Maven:

<dependency> <groupId>org.springframework.kafka</groupId> <artifactId>spring-kafka-test</artifactId> <scope>test</scope> </dependency>

For Gradle:

testImplementation 'org.springframework.kafka:spring-kafka-test'
  1. Write Test: Write a test case using JUnit and Spring's testing framework. In this example, we'll test the producer and consumer.
import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.kafka.test.context.EmbeddedKafka; import org.springframework.kafka.test.utils.KafkaTestUtils; import org.springframework.kafka.core.KafkaTemplate; import org.springframework.kafka.listener.ConcurrentMessageListenerContainer; import org.springframework.kafka.listener.MessageListener; import org.springframework.kafka.listener.ContainerProperties; import org.springframework.kafka.support.SendResult; import org.springframework.util.concurrent.ListenableFuture; import org.springframework.util.concurrent.ListenableFutureCallback; import java.util.concurrent.BlockingQueue; import java.util.concurrent.LinkedBlockingQueue; import java.util.concurrent.TimeUnit; import static org.assertj.core.api.Assertions.assertThat; @SpringBootTest @EmbeddedKafka(partitions = 1, topics = { "testTopic" }) class KafkaEmbeddedTest { @Autowired private KafkaTemplate<String, String> kafkaTemplate; private final BlockingQueue<String> records = new LinkedBlockingQueue<>(); @Test void testKafkaProducerAndConsumer() throws Exception { // Create a Kafka message listener ContainerProperties containerProps = new ContainerProperties("testTopic"); ConcurrentMessageListenerContainer<String, String> container = new ConcurrentMessageListenerContainer<>(kafkaTemplate.getProducerFactory(), containerProps); container.setupMessageListener((MessageListener<String, String>) record -> records.add(record.value())); container.start(); // Send a message ListenableFuture<SendResult<String, String>> future = kafkaTemplate.send("testTopic", "Hello, Kafka!"); future.addCallback(new ListenableFutureCallback<SendResult<String, String>>() { @Override public void onSuccess(SendResult<String, String> result) { System.out.println("Message sent successfully: " + result.getRecordMetadata().toString()); } @Override public void onFailure(Throwable ex) { System.out.println("Failed to send message: " + ex.getMessage()); } }); // Wait for the message to be received String receivedMessage = records.poll(10, TimeUnit.SECONDS); assertThat(receivedMessage).isNotNull(); assertThat(receivedMessage).isEqualTo("Hello, Kafka!"); } }
  1. Run Test: Run the test case using your IDE or build tool (e.g., Maven or Gradle). The embedded Kafka server will start automatically, and the test will execute.

This example demonstrates a simple test case that sends a message to a Kafka topic and verifies that the message is received by a consumer. You can expand on this example to test more complex scenarios or to test specific components of your Kafka-based application.

Examples

  1. How to setup embedded Kafka with Spring Boot?

    • Description: Setting up embedded Kafka with Spring Boot involves configuring dependencies and properties to integrate Kafka seamlessly into your application for testing purposes.
    @SpringBootTest @EmbeddedKafka(partitions = 1, brokerProperties = { "listeners=PLAINTEXT://localhost:9092", "port=9092" }) public class KafkaIntegrationTest { // Test logic here }

  2. Spring Boot Kafka embedded unit test example

    • Description: This query seeks a complete example demonstrating how to write unit tests for Kafka integration using embedded Kafka and Spring Boot.
    @Test public void testKafkaConsumer() { // Consumer testing logic here }

  3. How to produce messages to embedded Kafka using Spring Boot?

    • Description: Producing messages to an embedded Kafka instance with Spring Boot involves configuring a Kafka producer and sending messages to topics.
    @Autowired private KafkaTemplate<String, String> kafkaTemplate; public void produceMessage(String topic, String message) { kafkaTemplate.send(topic, message); }

  4. Spring Boot Kafka embedded integration test example

    • Description: This query aims to find a comprehensive example demonstrating integration testing with embedded Kafka and Spring Boot, covering scenarios like producing and consuming messages.
    @Test public void testKafkaIntegration() { // Integration testing logic here }

  5. How to consume messages from embedded Kafka using Spring Boot?

    • Description: Consuming messages from an embedded Kafka instance with Spring Boot involves configuring a Kafka consumer to subscribe to topics and process received messages.
    @KafkaListener(topics = "myTopic") public void listen(String message) { // Message processing logic here }

  6. Spring Boot Kafka embedded producer example

    • Description: This query seeks an example demonstrating how to configure a Kafka producer within a Spring Boot application to publish messages to Kafka topics.
    @Autowired private KafkaTemplate<String, String> kafkaTemplate; public void sendMessage(String topic, String message) { kafkaTemplate.send(topic, message); }

  7. How to create Kafka topic in embedded Kafka using Spring Boot?

    • Description: Creating Kafka topics within an embedded Kafka instance with Spring Boot involves specifying topic configurations and ensuring topic existence before tests.
    @BeforeEach public void setUp() { // Create topics here }

  8. Spring Boot Kafka embedded consumer example

    • Description: This query aims to find an example demonstrating how to configure a Kafka consumer within a Spring Boot application to subscribe to and process messages from Kafka topics.
    @KafkaListener(topics = "myTopic") public void receive(String message) { // Message handling logic here }

  9. How to write unit test for Kafka listener using embedded Kafka and Spring Boot?

    • Description: Writing unit tests for Kafka listeners using embedded Kafka and Spring Boot involves mocking the listener and verifying its behavior upon receiving messages.
    @Test public void testKafkaListener() { // Listener testing logic here }

  10. Spring Boot Kafka embedded topic creation example

    • Description: This query aims to find an example demonstrating how to programmatically create Kafka topics within a Spring Boot application to support integration testing with embedded Kafka.
    @BeforeAll public void setup() { // Topic creation logic here }

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