☕️ Picocli : mets du Java
dans ton terminal ! 🖥️

Merci !!!

🖐 Qui sait ce que signifie C.L.I ? 🖐

🖥️ Command Line Interface

✨ Faire du hype avec de l’ancien
🗓️ Date des années 60 - 70
🧩 Revient à la mode durant les années 2000 avec les Frameworks évolués
⚡️ Permet d’automatiser des actions dans un terminal
🤝 Simplifier l’accès aux API (souvent via un SDK)

Who knows what CLI means?
Yeah a lot of you know what CLI means, it's command line interface, it's hype making with the old stuff, it's 60s and 70s, we had passive terminals, we had mainframes, we had to talk to the mainframes, and so we started creating things through terminals to talk to the mainframes.

And then in the 2000s we had the emergence of frameworks that were a bit more or less complex to manipulate more or less complex to initialize and so the CLIs allowed to automate actions to manage these frameworks or to bootstrap projects.

And also it allowed us to dialog with APIs you know everything is API now doing CURL it's nice but it's a bit tedious so we put an SDK often between the two and then we make a CLI that allows to dialog with APIs.

There are known CLI like dockers or kubectl, and often it's very natural language oriented, and you describe what you want to do.

⚗️ Quelle technologie utiliser ?

KOBU Agency

👊 Toutes !
🐍 C, Python, Perl …
🦀 Ces derniers temps : Rust ou Go

Et en Java ?

kirill_makes_pics

🏋️ PICOCLI

Picocli

☕️ Du java pour faire une CLI …
… mais pas que :
🥰 Simple grâce aux annotations
🚀 Quarkus ❤️
🧐 Une vraie 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?

Démos

Illumination Entertainment

🎉 On a créé notre CLI !!! 😎

GraalVM !!

Pixar Studio

✨ Pour aller plus loin

Brian McGowan

📦 Encapsulation automatique des types et converteurs
🔡 Valeurs par défaut dynamiques, validation des valeurs, liste de choix, …
⛑️ Génération des pages man, coloration,
aide avancée
⚙️ Plusieurs exécutables par OS avec GraalVM
…

🤖 AI Endpoints

🧠 IA as a service
🧱 Llama, Mistral, DeepSeek-R1-Distill, Llava-Next-Mistral, Whisper, Qwen Coder, …
👩‍💻 Orientés développeuses / développeurs
☁️ Cloud de confiance, vos données vous appartiennent
🔓 Respect les API standard, unlock technologies
🔗 https://endpoints.ai.cloud.ovh.net/