# Java Decompiler MCP Server

> Use this tool when you need to reverse-engineer Java applications or libraries to understand their internal workings. It solves problems related to code obfuscation, debugging, and knowledge recovery by converting unreadable .class and .jar files into readable Java source code. The tool accepts .class and .jar files as input and outputs human-readable Java code, ideal for use in software development, debugging, and code analysis contexts.

Canonical page: https://skillsregistry.net/skills/ruoji6-java-decompile-mcp  
JSON: https://api.skillsregistry.net/v1/skills/ruoji6-java-decompile-mcp

## Description

An MCP-based Java decompilation tool that uses the CFR decompiler to convert .class and .jar files into readable Java source code. It features multi-threaded batch processing and direct file system output to handle large-scale decompilation while bypassing token limits.

## Trust

- **Trust score (0–1):** 0.94
- **Verification tier:** verified
- **Last scanned:** 2026-09-19

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** file-system
- **Updated:** 2026-09-19

## Source

- **Source listing:** [Glama](https://glama.ai/mcp/servers/rsprs2rjev)
- **Repository:** <https://github.com/RuoJi6/java-decompile-mcp>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "ruoji6-java-decompile-mcp"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/ruoji6-java-decompile-mcp` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/ruoji6-java-decompile-mcp/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt