https://github.com/leosimoes/java-spring-kafka-hello
Project in Java with Spring, Gradle and Kafka to create a topic producing and consuming application.
https://github.com/leosimoes/java-spring-kafka-hello
java kafka messaging spring
Last synced: about 2 months ago
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Project in Java with Spring, Gradle and Kafka to create a topic producing and consuming application.
- Host: GitHub
- URL: https://github.com/leosimoes/java-spring-kafka-hello
- Owner: leosimoes
- Created: 2024-04-14T14:35:01.000Z (about 2 years ago)
- Default Branch: master
- Last Pushed: 2024-04-14T19:00:58.000Z (about 2 years ago)
- Last Synced: 2025-03-24T20:43:40.343Z (over 1 year ago)
- Topics: java, kafka, messaging, spring
- Language: Java
- Homepage:
- Size: 921 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Spring Kafka - Hello
Project in Java with Spring, Gradle and Kafka to create a topic producing and consuming application.
## Steps
The steps of project implementation:
1. Create project (in IntelliJ) with:
- Java language (17);
- Spring Framework (6.2.3);
- Dependencies: Web, Kafka, DevTools.
2. Configure and run Kafka on local machine with Docker:
- Create the `docker-compose.yml` file:
```yml
version: '2'
services:
zookeeper:
image: confluentinc/cp-zookeeper:7.4.4
environment:
ZOOKEEPER_CLIENT_PORT: 2181
ZOOKEEPER_TICK_TIME: 2000
ports:
- 22181:2181
kafka:
image: confluentinc/cp-kafka:7.4.4
depends_on:
- zookeeper
ports:
- 29092:29092
environment:
KAFKA_BROKER_ID: 1
KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:9092,PLAINTEXT_HOST://localhost:29092
KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT
KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
```
- In the terminal run `docker-compose up`;
- Change `application.properties` to find Kafka:
```properties
spring.kafka.bootstrap-servers=localhost:29092
```
3. Create `HelloProducerService` class:
- annotated with `@Service`;
- with a `KafkaTemplate kafkaTemplate` attribute;
- with a constructor with an argument;
- with a `void sendMessage(String message)` method;
4. Create `HelloConsumerService` class:
- annotated with `@Service`;
- with a method `@KafkaListener(topics = "hello-topic", groupId = "group-1") public void receiveMessage(String message)`;
5. Create `HelloController` class:
- annotated with `@RestController` and `@RequestMapping("/kafka")`;
- with a `HelloProducerService service` attribute;
- with a constructor with one argument and annotated with `@Autowired`;
- with a method `@GetMapping("/hello/{name}") public String hello(@PathVariable("name") String name)`;
6. Test application with POSTMAN `localhost:8080/kafka/hello/leo`.
## References
Spring for Apache Kafka - Quick Tour:
https://docs.spring.io/spring-kafka/reference/quick-tour.html
Baeldung - Intro to Apache Kafka with Spring:
https://www.baeldung.com/spring-kafka
Introdução à Mensageria com Spring e Kafka - Giuliana Bezerra:
https://www.youtube.com/watch?v=97TF2xZgAhU | https://github.com/giuliana-bezerra/messaging-springboot