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Quarkus Kafka/Panache Reactive Quickstart

This project illustrates how you can interact with Apache Kafka using MicroProfile Reactive Messaging and Hibernate with Panache. The project uses:

  • RESTEasy Reactive
  • Reactive Messaging and its connector for Kafka
  • Hibernate Reactive with Panache

NOTE: The kafka-panache-quickstart provides the same example but using classic Hibernate.

Start the application

Start the application in dev mode with:

mvn quarkus:dev

NOTE: Quarkus Dev Services starts the database and Kafka broker automatically.

Then, open your browser to http://localhost:8080/prices, and you should get the set of prices written in the database. Every 5 seconds, a new price is generated, sent to a Kafka topic, received by a Kafka consumer, and written to the database. Refresh the page to see more prices.

Anatomy

  • PriceGenerator - a bean generating random price. They are sent to a Kafka topic.
  • PriceStorage - on the consuming side, the PriceStorage receives the Kafka message and write it into the database using Hibernate with Panache
  • PriceResource - the PriceResource retrieves the prices from the database and send them into the HTTP response

Running in native

You can compile the application into a native binary using:

mvn clean install -Pnative

As you are not in dev or test mode, you need to start a PostgreSQL instance and a Kafka broker. To start them, just run docker-compose up -d.

Then, run the application with:

./target/kafka-panache-reactive-quickstart-1.0.0-SNAPSHOT-runner