What is java-21?
Java 21 language and runtime patterns for modern, safe code. Trigger: When writing Java 21 code using records, sealed types, or virtual threads. Source: gentleman-programming/gentleman-skills.
·java-21
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java-21
✓gentleman-programming/gentleman-skillsGitHub: gentleman-programming/gentleman-skillsSource: gentleman-programming/gentleman-skills
Java 21 language and runtime patterns for modern, safe code. Trigger: When writing Java 21 code using records, sealed types, or virtual threads.
Installation
How to Install java-21
Quickly install java-21 AI skill to your development environment via command line
- Open Terminal: Open your terminal or command line tool (Terminal, iTerm, Windows Terminal, etc.)
- Run Installation Command: Copy and run this command: npx skills add https://github.com/gentleman-programming/gentleman-skills --skill java-21
- Verify Installation: Once installed, the skill will be automatically configured in your AI coding environment and ready to use in Claude Code, Cursor, or OpenClaw
Source: gentleman-programming/gentleman-skills.
SKILL.md
View rawUse records for DTOs and value objects, validate in compact constructors.
Use sealed interfaces/classes and switch pattern matching for exhaustiveness.
Use virtual threads to handle blocking I/O without large thread pools.
Java 21 language and runtime patterns for modern, safe code. Trigger: When writing Java 21 code using records, sealed types, or virtual threads. Source: gentleman-programming/gentleman-skills.
Facts (cite-ready)
Stable fields and commands for AI/search citations.
- Install command
npx skills add https://github.com/gentleman-programming/gentleman-skills --skill java-21- Category
- </>Dev Tools
- Verified
- ✓
- First Seen
- 2026-02-28
- Updated
- 2026-03-10
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Quick answers
How do I install java-21?
Open your terminal or command line tool (Terminal, iTerm, Windows Terminal, etc.) Copy and run this command: npx skills add https://github.com/gentleman-programming/gentleman-skills --skill java-21 Once installed, the skill will be automatically configured in your AI coding environment and ready to use in Claude Code, Cursor, or OpenClaw
Where is the source repository?
https://github.com/gentleman-programming/gentleman-skills
Details
- Category
- </>Dev Tools
- Source
- skills.sh
- First Seen
- 2026-02-28