Picocli: put some Java in your terminal! 🖥️

Thanks !!!

Belinda Fewings

Stéphane Philippart

🏷️ 🥑 DeveloperAdvocate@OVHCloud 🦄
🏷️ TADx co-creator (meetups in Tours)

☕️ Cloud Java Developer ☁️

🐦 @wildagsx
🔗 https://philippart-s.github.io/blog
🐙 https://github.com/philippart-s/
💬 https://www.linkedin.com/in/philippartstephane/

⚗️ Which technology should I use?

KOBU Agency

👊 All!
🐍 C, Python, Perl …
🦀 These days: Rust or Go

What about Java?

kirill_makes_pics

🏋️ PICOCLI

Picocli

☕️ Java to make a CLI…
… but not only:
🥰 Simple with annotations
🚀 Quarkus ❤️
🧐 A real CLI?

Just few slides before coding.

If you are looking to create a CLI with Java, there is a high chances that you will come across Picocli, it is the most represented framework to make a CLI with Java.

Not only in pure Java but also in Kotlin, Scala and Groovy.

With Picocli it's a lot of annotations to simplify the writing, if you left Java 15 years ago: Java is like the others now we have annotations and syntactic sugar.
We just make arobas and then it works by magic, it's a big summary, obviously.

I will use Quarkus too.
Who knows Quarkus, who uses Quarkus in production?
Quarkus mantra is: subatomic, supersonic, Java.
What I'm saying is like your Java applications take a lot of vitamines!
It's very efficient for cloud native development.
But we're not going to use it on the cloud native part we're going to use if for the developer experience.

You'll see it's quite magical and what I propose is, at the end of this talk, to know if I won my bet: did I make you a CLI in Java?

Demos

Illumination Entertainment

🎉 We have created our CLI!!! 😎

GraalVM!!

Pixar Studio

✨ To go further

Brian McGowan

📦 Automatic type encapsulation and converter
🔡 Dynamic default values, values validation, choice list, …
⛑️ Generating man pages, coloring, advanced help
⚙️ Several executables per OS with GraalVM
…

🤖 AI Endpoints

🧠 IA as a service
🧱 Llama, Mistral, DeepSeek-R1-Distill, Llava-Next-Mistral, Whisper, Qwen, …
https://endpoints.ai.cloud.ovh.net/catalog
👩‍💻 Developer oriented
☁️ Trusted cloud, your data belongs to you
🔓 Compliance with standard APIs, unlock technologies
🔗 https://endpoints.ai.cloud.ovh.net/

🔗 Links

https://picocli.info/

https://quarkus.io/

https://quarkus.io/guides/cli-tooling

https://quarkus.io/guides/picocli

https://quarkus.io/guides/dev-mode-differences

https://www.graalvm.org/latest/docs/getting-started/

https://github.com/quarkusio/quarkus/tree/main/devtools/cli

https://github.com/gouz/slidesk

Thanks!!!


Slides https://ovh.to/Zz5mgvw	Feedback https://ovh.to/z84NqM	Sources https://ovh.to/DGo3N1U