Java Quarkus CQRS and EventSourcing microservice example 👋💫✨

👨‍💻 Full list what has been used:

• Quarkus - Supersonic Subatomic Java.
• RESTEasy Reactive - RESTEasy Reactive in Quarkus
• Reactive PostgreSQL Client -The Reactive PostgreSQL Client.
• quarkus-mongodb-client - MongoDB client
• hibernate-validator - Hibernate validator
• OpenAPI and Swagger UI - OpenAPI and Swagger UI
• Micrometer metrics - Micrometer metrics
• OpenTracing - Jaeger OpenTracing
• Kafka Reactive - SmallRye Reactive Messaging to interact with Apache Kafka.
• Docker - Docker
• Prometheus - Prometheus
• Grafana - Grafana
• Jaeger - Jaeger tracing
• Flyway - database migrations.
• SmallRye Fault Tolerance - Fault Tolerance.

Swagger UI:

http://localhost:8006/q/swagger-ui

Jaeger UI:

http://localhost:16686

Prometheus UI:

http://localhost:9090

Grafana UI:

http://localhost:3005

For local development:

make local // runs docker-compose.yml
./mvnw compile quarkus:dev // run microservice

Running the application in dev mode

You can run your application in dev mode that enables live coding using:

./mvnw compile quarkus:dev

NOTE: Quarkus now ships with a Dev UI, which is available in dev mode only at http://localhost:8080/q/dev/.

Packaging and running the application

The application can be packaged using:

./mvnw package

It produces the quarkus-run.jar file in the target/quarkus-app/ directory. Be aware that it’s not an über-jar as the dependencies are copied into the target/quarkus-app/lib/ directory.

The application is now runnable using java -jar target/quarkus-app/quarkus-run.jar.

If you want to build an über-jar, execute the following command:

./mvnw package -Dquarkus.package.type=uber-jar

The application, packaged as an über-jar, is now runnable using java -jar target/*-runner.jar.

Creating a native executable

You can create a native executable using:

./mvnw package -Pnative

Or, if you don't have GraalVM installed, you can run the native executable build in a container using:

./mvnw package -Pnative -Dquarkus.native.container-build=true