Demo Project for Online Stream #22 - Command Line Apps

Demo project for online stream #22 where a command line application is created that performs different command based on command line arguments, that are parsed and handled by the Picocli library.

Access to Online Stream on YouTube

To get a link to online stream on YouTube please do the following:

• 💰 Make any donation to support my volunteering initiative to help Ukrainian Armed Forces by means described on my website
• 📧 Write me an email indicating donation amount and time
• 📺 I will reply with the link to the stream on YouTube.

Thank you in advance for your support! Слава Україні! 🇺🇦

Technologies

• Quarkus
• Picocli

Running the application in dev mode

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

./gradlew quarkusDev

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:

./gradlew build

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

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

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

./gradlew build -Dquarkus.package.type=uber-jar

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

Creating a native executable

You can create a native executable using:

./gradlew build -Dquarkus.package.type=native

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

./gradlew build -Dquarkus.package.type=native -Dquarkus.native.container-build=true

You can then execute your native executable with: ./build/quarkus-picocli-1.0.0-SNAPSHOT-runner

If you want to learn more about building native executables, please consult https://quarkus.io/guides/gradle-tooling.

Related Guides

• Picocli with Quarkus (guide): Develop command line applications with Picocli
• Picocli with Spring (example)
• Picocli small guide: Create a Java Command Line Program with Picocli
• Picocli official documentation (site)