Agent skills for Java projects
118 open-license skills in our database are built for Java, and 368 skills match a typical Java project. Below: what coding agents get wrong on Java, 3 picks to start with, and where each agent loads them.
Updated 2026-10-18. Tags used for this page: java.
What coding agents get wrong in Java
Agents write Java 8 code in a Java 21 project: no records, no pattern matching, no text blocks. They mix JUnit 4 and JUnit 5 annotations and catch Exception where a specific type fits.
Skills that help
Skills for Java code review, JUnit 5 tests and JDK upgrades. Add the Spring Boot page picks when the project runs on Spring.
Cursor rules: the database holds 15 Cursor rule files (.mdc) tagged Java (general-java-development-practices, java, and more). Cursor reads them from .cursor/rules/. Other agents load SKILL.md skills, so most picks here are skills.
3 picks to start with
1. java-code-review
Review Java code for bugs, duplicate code, correctness risks, maintainability improvements, and missing tests.
npx skills add sivaprasadreddy/sivalabs-agent-skills --skill java-code-review
2. java-junit
Get best practices for JUnit 5 unit testing, including data-driven tests
npx skills add github/awesome-copilot --skill java-junit
3. java-upgrade
Upgrade a Java project to a newer JDK (11 to 17, 17 to 21, 21 to 25) and adopt the new language and library features.
npx skills add github/awesome-copilot --skill java-upgrade
Get the list for your exact project
These 3 fit Java in general. The scan box opens with a sample Java description you can edit. A scan reads your repo or description, shows the match count and 2 picks free, and the full curated list (up to 30 picks with install commands, reasons and overlap notes) costs $9 once.
Where each agent loads Java skills
- Claude Code: project folder
.claude/skills/, install flag--agent claude-code - Cursor: project folder
.cursor/skills/ or .agents/skills/, install flag--agent cursor - Codex: project folder
.agents/skills/, install flag--agent codex - GitHub Copilot: project folder
.github/skills/ or .agents/skills/, install flag--agent github-copilot
npx skills add owner/repo --skill skill-name --agent claude-code
How we count
We match project tags against 99,639 skills from 7,206 public GitHub repos (refreshed 2026-10-18). A skill built for another framework or language is left out, and so is a skill below our relevance floor. The picks on this page come from the ranked list for these tags. We favor broad practice skills over single-task ones. Licenses are shown as each repo declares them. Read a skill before you install it.
Questions
What agent skills should I use for Java?
Start with a broad practice skill built for Java, then add skills for testing and review. In our database 118 skills are tagged for Java and 368 skills match a typical Java project. The picks on this page are a place to start. A scan of your repo ranks the full list for your tasks.
Is there a skill for JDK upgrades?
Yes. java-upgrade from github/awesome-copilot moves a project to a newer JDK (11 to 17, 17 to 21, 21 to 25) and adopts the new language features.
Are there Cursor rules for Java?
Yes. The database holds 15 Cursor rule files (.mdc) tagged Java. Cursor loads them from .cursor/rules/. Claude Code, Codex and Copilot do not read .mdc rules, so pick SKILL.md skills for those agents.
Where do Java skills go for Claude Code, Cursor, Codex and Copilot?
Claude Code reads .claude/skills/, Cursor reads .cursor/skills/ or .agents/skills/, Codex reads .agents/skills/, and GitHub Copilot reads .github/skills/ or .agents/skills/. The install command takes --agent with the agent name and copies the skill folder there.
Why 3 picks here?
The right list depends on your exact stack and tasks. Run a free scan for your project to see its match count and 2 picks. The full curated list is $9 once.
Related stacks
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By agent
Skills for Claude CodeSkills for CursorSkills for CodexSkills for GitHub Copilot