# Java Decompiler MCP Server

> Java Decompiler MCP Server — ruoji6-java-decompiler-mcp. Use this tool when you need to reverse-engineer Java binaries into readable source code, solving problems like lost or obfuscated code recovery, and debugging complex Java applications. It takes Java .class and .jar files as input and produces decompiled source code as output. Ideal for use cases where original source code is unavailable, such as legacy system maintenance or third-party library analysis.

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

## Description

An MCP server that uses the CFR decompiler to convert Java .class and .jar files back into readable source code. It supports single-file, batch, and recursive directory decompilation with automated CFR tool management.

## Trust

- **Trust score (0–1):** 0.93
- **Verification tier:** verified
- **Last scanned:** 2026-09-28

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** file-system
- **Updated:** 2026-09-28

## Source

- **Source listing:** [Glama](https://glama.ai/mcp/servers/l0z8cn2f72)
- **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-decompiler-mcp"
    }
  }
}
```

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