# Java

> Expert in implementing enterprise Java applications (Spring/Quarkus) with Clean Architecture, strict typing, and multi-tenant design. Covers Gradle, Maven, and modern Java patterns.

- Skill: `takayatomose/java` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add takayatomose/java`
- Raw SKILL.md: https://api.skillmd.com/api/skills/takayatomose/java/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: takayatomose (https://skillmd.com/u/takayatomose)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/takayatomose/java

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# Skill: Java Backend Development

## Overview

Expert in implementing enterprise Java applications (Spring Boot, Quarkus) with Clean Architecture and strict typing.

## Rule Categories

| Priority | Category | Impact |
| :--- | :--- | :--- |
| 1 | [Java Idioms](rules/idioms.md) | HIGH |
| 2 | [Error Handling](rules/errors.md) | MEDIUM |

## Core Expertise

- **Clean Architecture**: Domain → Application → Presentation.
- **Strict Typing**: Generics, Records (Java 14+), and Sealed classes.
- **Exception-Based Error Handling**: Domain exceptions and global handlers.

## Instructions for the Agent

- **Consult Internal Rules**: Always refer to the `rules/` directory within this skill for Java-specific idioms and error codes.
- **Dependency Injection**: Use constructor-based injection (no @Autowired on fields).
- **Type Safety**: Use proper generics; avoid Object casts and raw types.