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Founded by passionate advocates of learning and innovation, Learni set out to make professional training accessible to everyone, everywhere in the world. Our team works in the largest cities such as Paris, Lyon, Marseille, and internationally, to support talents and organizations in their skills development.
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Don't let this gap widen
Without Picocli mastery, Java CLI tools suffer from fragile argument parsing and inconsistent user experiences, frustrating developers and end-users alike.
Teams waste an average of 10 hours per developer weekly on debugging and rework, equating to $75,000 in lost productivity annually for a 10-person squad.
These inefficiencies trigger 40% of deployment delays and security misconfigurations, endangering company revenue and personal career trajectories.
Every month without expertise, risks escalate as subpar CLIs erode competitive edge.
The Developing Java Command-Line Tools with Picocli: The Complete Training training is delivered in-person or remotely (blended-learning, e-learning, virtual classroom, remote in-person). At Learni, a Qualiopi-certified training organization, each program is designed to maximize skills acquisition, regardless of the training mode chosen.
The trainer alternates between demonstrative, interrogative, and active methods (through practical exercises and/or real-world scenarios). This pedagogical approach ensures concrete and directly applicable learning in the workplace.
To ensure the quality of the Developing Java Command-Line Tools with Picocli: The Complete Training training, Learni provides the following teaching resources:
For in-house training at a location external to Learni, the client ensures and commits to having all necessary teaching materials (IT equipment, internet connection...) for the proper conduct of the training action in accordance with the prerequisites indicated in the communicated training program.
The assessment of skills acquired during the Developing Java Command-Line Tools with Picocli: The Complete Training training is carried out through:
Learni is committed to the accessibility of its professional training programs. All our training programs are accessible to people with disabilities. Our teams are available to adapt teaching methods to your specific needs. Do not hesitate to contact us for any accommodation request.
Learni training programs are available for inter-company and intra-company settings, both in-person and remote. Registration is possible up to 48 business hours before the start of training. Our programs are eligible for OPCO, Pôle emploi, and FNE-Formation funding. Contact us to discuss your training project and funding possibilities.
Introduction to Picocli, installation, history, and context; First steps: creating a Java project with Picocli; Fundamental principles: annotations, parsing of options and arguments, structure of the main command; Best practices for scalable CLI architecture; Guided exercise: develop your first custom command
Creating and managing complex subcommands; Command inheritance; Automatic validation of options and error handling; Autocompletion integration (Bash, Zsh, Fish, and CMD/PowerShell shells); Automatic generation of help and documentation; Practical workshops: build a multi-level interactive CLI
Unit and integration testing for Picocli tools: techniques and recommended frameworks; Packaging and distribution of a CLI application (JAR, native with GraalVM, single executable, wrapper scripts); Configuration management and persistence; Security and robustness of CLI tools; Evolutionary maintenance, community support, and technical monitoring around Picocli; Final hands-on: build a complete production-ready CLI project
Target audience
Java developers, software engineers, technical architects who wish to design high-performance CLI applications in Java
Prerequisites
Fundamental knowledge of Java and basic command-line concepts
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