From the root directory of the repository:

1. Run ./mvnw clean install -pl :flight-tracker-common to build the common module and install its jar into your local Maven repository.
2. Run ./mvnw clean quarkus:dev -pl :flight-tracker-data-simulator to start the data-simulator Quarkus app.
3. Open another terminal and run ./mvnw clean quarkus:dev -pl :flight-tracker-data-aggregator to start the data-aggregator Quarkus app.
4. Open another terminal and run ./mvnw clean quarkus:dev -pl :flight-tracker-map-service to start the map-service Quarkus app.
5. Open http://localhost:8090 and start playing with the UI.

This demo does not require any local Kafka server or PostgreSQL server. Quarkus will automatically start these servers in dev mode (quarkus:dev) thanks to the Quarkus Dev Services. The Kafka Dev Service will be shared between all apps of the demo, meaning that the apps will automatically be able to exchange messages through the Kafka topics.