Day-to-day plain Java development without a framework: Maven and Gradle usage and wrappers, project layout, dependency and vulnerability management, modern Java idioms by JDK version (records, sealed types, pattern matching, virtual threads), SLF4J logging, error and null handling, immutability, concurrency basics, static analysis and formatting (Spotless, Error Prone, -Xlint), packaging (jar…
Install
npx skills add github/awesome-copilot --skill java-developmentnpx skills add github/awesome-copilot --skill java-development -a claude-code -gnpx skills add github/awesome-copilot --skill java-development -a codex -ggemini skills install https://github.com/github/awesome-copilot.git --path skills/java-developmentgh skill install github/awesome-copilot java-developmentgit clone --depth 1 https://github.com/github/awesome-copilot /tmp/github__awesome-copilot
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/github__awesome-copilot/skills/java-development ~/.claude/skills/java-development # Claude Code
cp -R /tmp/github__awesome-copilot/skills/java-development ~/.agents/skills/java-development # Codex, Cursor, Gemini CLI, Copilot, OpenCode