# Core Use Case Java

> Criar use cases Java implementando UseCase. Usar quando o pedido envolver command handler, caso de uso ou orquestração application.

- Skill: `eskcti/core-use-case-java` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add eskcti/core-use-case-java`
- Raw SKILL.md: https://api.skillmd.com/api/skills/eskcti/core-use-case-java/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: EskCti (https://skillmd.com/u/eskcti)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/eskcti/core-use-case-java

---


# Core Use Case (Java)

## Overview

Use cases em `application/usecase/CreateCustomerUseCase.java` — implementando `UseCase<CreateCustomerInput, Customer>`.

## Guidelines

- Injetar `<Entity>Repository` (port, não adapter concreto) via construtor.
- Orquestrar domínio; retornar `Result`.
- Classe plain Java em `packages/<bc>/`; wiring Spring em `*ModuleConfig` no backend.

## Workflow

1. Definir input/output DTOs.
2. Implementar classe + `UseCase`.
3. Registrar `@Bean` no backend — wire no controller (`backend-controller-java`).

## Global Standards

- Consultar `../config-shared-core-java/references/java-namespace-layout.md`.