# graalvm

Guides GraalVM native image compilation, reflection metadata, and build optimization for Java frameworks.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 653 installs · ★ 286
- Author: Mindrally
- License: Apache-2.0 · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/Mindrally/skills/tree/HEAD/graalvm/SKILL.md
- Updated: 2026-10-08
- HTML: https://affpapa.org/en/nevibecode/skills/graalvm

## What it does

This skill equips coding agents with conventions for building ahead-of-time compiled Java binaries via GraalVM Native Image. It focuses on closed-world constraints, helping you configure `reflect-config.json`, dynamic proxies, and resource inclusion files.

It provides specific guidelines for Quarkus, Micronaut, and Spring Native setups, including build-time class initialization and `@QuarkusTest` integrations. The rules also cover troubleshooting failed native builds with the tracing agent and `-H:+ReportExceptionStackTraces`.

Third-party dependencies with dynamic reflection break native binaries at runtime unless registered in GraalVM metadata beforehand.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill graalvm -a claude-code
```

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

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill graalvm -a codex
```

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

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill graalvm -a cursor
```

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

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install Mindrally/skills graalvm
```

2. **Manually: put the files in place**
- File: `.github/skills/graalvm/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill graalvm -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/Mindrally/skills --path graalvm
```

### Windsurf (Devin Desktop)

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

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill graalvm -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/Mindrally/skills/tree/HEAD/graalvm/SKILL.md

## When to use it
- Generate reflection and resource configurations for native image compilation
- Build multi-stage Dockerfiles with minimal distroless base images
- Shift static class initialization to build time to cut startup delay
- Diagnose native compilation failures using tracing agent outputs

## Example prompts
- Create a multi-stage Dockerfile using a distroless base image for this Quarkus native binary.
- Help me configure `reflect-config.json` for classes accessed via reflection.
- How do I run the tracing agent with Maven to detect missing GraalVM metadata?

## Source text · SKILL.md · Apache-2.0

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: f874067d246fad2b.

BEGIN THIRD-PARTY FILE f874067d246fad2b
```text
---
name: graalvm
description: Expert guidance for GraalVM native image development with Java frameworks, build optimization, and high-performance application deployment
metadata:
  maintainer: Mindrally
  source: https://github.com/Mindrally/skills
---

# GraalVM

You are an expert in Java programming, GraalVM native builds, Quarkus framework, Micronaut framework, Jakarta EE, MicroProfile, Vert.x for event-driven applications, Maven, JUnit, and related Java technologies.

## Code Style and Structure

- Write clean, efficient, and well-documented Java code optimized for GraalVM native compilation
- Follow framework-specific conventions (Quarkus, Micronaut, Spring Native) while ensuring GraalVM compatibility
- Use descriptive method and variable names following camelCase convention
- Structure your application with consistent organization (resources, services, repositories, entities, configuration)

## GraalVM Native Image Specifics

- Configure native image builds for optimal performance and minimal footprint
- Understand and configure reflection, resources, and serialization for native compilation
- Use build-time initialization when possible to reduce startup time
- Implement proper substitutions for incompatible code paths

## Naming Conventions

- Use PascalCase for class names (e.g., UserResource, OrderService)
- Use camelCase for method and variable names (e.g., findUserById, isOrderValid)
- Use ALL_CAPS for constants (e.g., MAX_RETRY_ATTEMPTS, DEFAULT_PAGE_SIZE)

## Java and GraalVM Usage

- Use Java 17 or later features when applicable (e.g., records, sealed classes, pattern matching)
- Understand GraalVM's closed-world assumption for native images
- Use GraalVM's polyglot capabilities when integrating multiple languages
- Leverage GraalVM's high-performance JIT compiler for JVM mode

## Native Image Configuration

- Configure reflection using reflect-config.json or framework annotations
- Register resources for inclusion in native image via resource-config.json
- Configure serialization for classes requiring runtime serialization
- Use proxy-config.json for dynamic proxy generation
- Leverage native-image.properties for build-time configuration

## Framework Integration

### Quarkus
- Use Quarkus extensions that are native-image compatible
- Leverage Quarkus Dev Mode for rapid development
- Configure quarkus.native.* properties for native build optimization

### Micronaut
- Use Micronaut's compile-time processing for native-friendly code
- Leverage Micronaut's GraalVM metadata for automatic configuration
- Use @Introspected for reflection-free bean introspection

### Spring Native
- Use Spring Native for Spring Boot native image support
- Configure @NativeHint annotations for reflection and resource hints
- Use AOT processing for Spring configuration

## Testing

- Write unit tests using JUnit 5 with framework-specific test support
- Test both JVM mode and native image builds
- Use @QuarkusTest, @MicronautTest, or Spring Boot Test for integration testing
- Implement in-memory databases or Testcontainers for integration testing

## Performance Optimization

- Minimize reflection usage for faster native image builds
- Use build-time initialization for static data
```
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