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Java 21

Checked
gentleman-programming·vlatest·backend·MIT

Generates, debugs, and optimizes Java 21 code snippets & applications leveraging best practices and modern APIs.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add gentleman-programming/gentleman-skills --skill java-21 -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

gentleman-programming

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned gentleman-programming/gentleman-skills at c8036a3789.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
c8036a3789
Manifest
community/java-21/SKILL.md
Scanned
1 file, 112 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill provides access to Java 21, the latest long-term support release of the Java Standard Edition (SE) platform. It enables AI agents to execute Java code, leverage its extensive libraries, and build robust backend applications. The agent can compile, run, and debug Java programs directly within the environment.

When to use it

  • Backend Development: Build server-side logic for web applications or APIs using Java 21's features.
  • Data Processing: Process large datasets with efficient Java algorithms and data structures.
  • Scripting & Automation: Automate tasks and create scripts using the power of the Java language.
  • Code Compilation: Compile existing Java codebases for deployment or analysis.

Key capabilities

  • Java 21 runtime environment
  • Compilation support
  • Debugging tools
  • Access to standard Java libraries

Example prompts

  • "Compile and run this Java code: [code snippet]"
  • "Write a simple 'Hello, World!' program in Java."
  • "Debug the following Java code and identify any errors: [code snippet]"

Tips & gotchas

  • Ensure your AI agent has sufficient memory allocated for compiling and running larger Java projects.
  • Familiarity with basic Java syntax is recommended to effectively utilize this skill.