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Java 21 To 25 Migration

Checked
rezkam·vlatest·backend·Apache-2.0

Helps with Java, migration as part of developing backend services and APIs workflows.

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 rezkam/boring-but-good --skill java-21-to-25-migration -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

rezkam

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 rezkam/boring-but-good at c9015166ff.

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

Commit
c9015166ff
Manifest
skills/java-21-to-25-migration/SKILL.md
Scanned
9 files, 976 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 facilitates the migration of Java projects from versions 21 to 25. It automates compatibility checks and code adjustments necessary for a smooth upgrade, minimizing manual effort and potential errors during the process. The tool handles changes in language features, APIs, and build system configurations across these Java releases.

When to use it

  • You need to update a large Java codebase from version 21 to a newer supported version (up to 25).
  • Your project relies on deprecated features that require replacement or adaptation for compatibility.
  • You want to leverage new language features and improvements introduced in Java versions 22, 23, and 24 without significant manual refactoring.
  • Automating the migration process to reduce risk of errors and accelerate delivery timelines.

Key capabilities

  • Compatibility checks across Java 21-25 releases.
  • Automated code adjustments for API changes.
  • Handling of deprecated features.
  • Build system configuration updates.

Example prompts

  • "Migrate my project from Java 21 to Java 23."
  • "Check for compatibility issues when upgrading to Java 25."
  • "What code adjustments are needed for Java 24?"

Tips & gotchas

  • Ensure your project's dependencies are compatible with the target Java version before initiating migration.
  • Review the automated changes carefully, as some manual intervention might still be required depending on the complexity of the codebase.