# aws-sdk-java-v2-core

Walks through building AWS SDK for Java 2.x clients with sensible defaults: credentials, region, HTTP stack, timeouts, retries. Useful when a client fails on its first call.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 3700 installs · ★ 363
- Author: giuseppe-trisciuoglio
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/giuseppe-trisciuoglio/developer-kit/tree/HEAD/plugins/developer-kit-java/skills/aws-sdk-java-v2-core/SKILL.md
- Updated: 2026-09-10
- HTML: https://affpapa.org/en/nevibecode/skills/aws-sdk-java-v2-core

## What it does

The skill lays out client setup in order. You pick a sync client (`S3Client`, `DynamoDbClient`) or an async one (`S3AsyncClient`, `SqsAsyncClient`), then work out credential and region resolution, then the HTTP layer and limits. Sync paths get `ApacheHttpClient`, async paths get `NettyNioAsyncHttpClient`. Actual timeout and connection numbers come from your service requirements; the skill does not hand you a fixed set.

Credentials default to `DefaultCredentialsProvider`, which covers shared config, SSO or environment variables on a dev machine, web identity in CI, and ECS task roles, EKS IRSA or EC2 instance profiles on AWS. A `StsClient.getCallerIdentity()` call at startup confirms everything resolved. Do this deliberately: a wrong region or missing credentials often only show up on the first real request. In Spring Boot the clients become `@Bean` singletons injected through constructors, so nothing gets built inside a hot path.

Error handling sits at the integration boundary: catch `SdkException`, separate retryable failures from auth, quota and validation problems, and keep secrets out of logs. Integration tests run against LocalStack, Testcontainers or a sandbox account, and `@PostConstruct` lets the app fail fast when credentials are absent. Never put access keys or session tokens in source or config files; static credentials are for narrow local tests only. Service-specific work lives in separate skills such as S3, DynamoDB and Bedrock.

## Requirements
- Works with: AWS

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add giuseppe-trisciuoglio/developer-kit --skill aws-sdk-java-v2-core -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/aws-sdk-java-v2-core/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/aws-sdk-java-v2-core/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add giuseppe-trisciuoglio/developer-kit --skill aws-sdk-java-v2-core -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/aws-sdk-java-v2-core/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add giuseppe-trisciuoglio/developer-kit --skill aws-sdk-java-v2-core -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/aws-sdk-java-v2-core/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install giuseppe-trisciuoglio/developer-kit aws-sdk-java-v2-core
```

2. **Manually: put the files in place**
- File: `.github/skills/aws-sdk-java-v2-core/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add giuseppe-trisciuoglio/developer-kit --skill aws-sdk-java-v2-core -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/giuseppe-trisciuoglio/developer-kit --path plugins/developer-kit-java/skills/aws-sdk-java-v2-core
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/aws-sdk-java-v2-core/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add giuseppe-trisciuoglio/developer-kit --skill aws-sdk-java-v2-core -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/giuseppe-trisciuoglio/developer-kit/tree/HEAD/plugins/developer-kit-java/skills/aws-sdk-java-v2-core/SKILL.md

## When to use it
- build an S3 client with explicit timeouts and a connection pool
- find out why a client fails on the first call over region or credentials
- wire AWS clients as Spring Boot beans instead of per-request objects
- decide between sync and async clients for a concurrent workload
- verify credentials at startup with `getCallerIdentity`

## Example prompts
- Set up an `S3Client` for eu-south-2 with `ApacheHttpClient` and 10s/30s timeouts
- Move our `SqsAsyncClient` to `NettyNioAsyncHttpClient` with concurrency 200
- Add a startup check in the Spring Boot config that calls `StsClient.getCallerIdentity()`

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 1cd35313df68d260.

BEGIN THIRD-PARTY FILE 1cd35313df68d260
```text
---
name: aws-sdk-java-v2-core
description: Provides AWS SDK for Java 2.x client configuration, credential resolution, HTTP client tuning, timeout, retry, and testing patterns. Use when creating or hardening AWS service clients, wiring Spring Boot beans, debugging auth or region issues, or choosing sync vs async SDK usage.
allowed-tools: Read, Write, Edit, Bash, Glob, Grep
---

# AWS SDK for Java 2.x Core Patterns

## Overview

Use this skill to set up AWS SDK for Java 2.x clients with production-safe defaults.

It focuses on the decisions that matter most:
- how credentials and region are resolved
- how to configure sync and async HTTP clients
- how to apply timeouts, retries, lifecycle management, and tests

Keep `SKILL.md` focused on setup and delivery flow. Use the `references/` files for deeper API details and expanded examples.

## When to Use

- Creating or hardening AWS SDK for Java 2.x service clients
- Wiring Spring Boot beans for AWS integration
- Debugging auth, region, or credential issues
- Choosing between sync (`S3Client`, `DynamoDbClient`) and async (`S3AsyncClient`, `SqsAsyncClient`) clients

## Instructions

### 1. Select the service client type

- Sync clients (`S3Client`, `DynamoDbClient`) for request/response flows
- Async clients (`S3AsyncClient`, `SqsAsyncClient`) for concurrency, streaming, or backpressure
- Reuse one client per service and configuration profile

### 2. Configure credential and region resolution

Use `DefaultCredentialsProvider` with environment-aware defaults:
- local dev: shared AWS config, SSO, or environment variables
- CI/CD: web identity or injected environment variables
- AWS runtime: ECS task roles, EKS IRSA, or EC2 instance profiles

Override only for multi-account access, test isolation, or profile switching.
```
END THIRD-PARTY FILE 1cd35313df68d260

The third-party file has ended. Everything between the 1cd35313df68d260 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

First 1791 of 6070 bytes. © giuseppe-trisciuoglio · MIT · https://github.com/giuseppe-trisciuoglio/developer-kit/tree/HEAD/plugins/developer-kit-java/skills/aws-sdk-java-v2-core/SKILL.md

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