filesystem vs LSP4J-MCP

Side-by-side comparison to help you pick between these two MCP servers.

	filesystem by modelcontextprotocol	LSP4J-MCP by stephanj
Stars	★ 85,748	★ 23
30d uses	—	—
Score	77	42
Official	✓	—
Categories	File SystemDeveloper ToolsProductivity	Developer ToolsAI / LLM Tools
Language	TypeScript	Java
Last commit	this month	4 mo ago

filesystem · Summary

A feature-rich MCP server for filesystem operations with dynamic directory access control.

LSP4J-MCP · Summary

Java MCP server wrapping JDTLS to provide Java IDE features like symbol search and reference finding to AI assistants.

filesystem · Use cases

Enable AI models to read and write project files during development
Allow Claude or other MCP clients to browse and analyze codebases
Provide secure sandboxed access to specific directories for content generation

LSP4J-MCP · Use cases

AI assistants analyzing Java code structure and finding classes or methods
Refactoring assistance by finding all references to specific code elements
Code navigation to definitions and implementations of interfaces or methods
Understanding large Java codebases by exploring relationships between symbols

filesystem · Install

Installation

Using NPX

{
  "mcpServers": {
    "filesystem": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-filesystem",
        "/path/to/allowed/directory"
      ]
    }
  }
}

Using Docker

{
  "mcpServers": {
    "filesystem": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "--mount", "type=bind,src=/path/to/allowed/dir,dst=/projects/allowed/dir",
        "mcp/filesystem",
        "/projects"
      ]
    }
  }
}

VS Code Extension

Click the installation buttons in the README to install directly in VS Code.

LSP4J-MCP · Install

Installation

Prerequisites

Java 21+
Maven 3.8+
JDTLS installed (e.g., via Homebrew: brew install jdtls)

Build

mvn clean package

This creates a shaded JAR at target/lsp4j-mcp-1.0.0-SNAPSHOT.jar.

Claude Desktop Configuration

Add to your .claude_desktop_config.json:

{
  "mcpServers": {
    "java-lsp": {
      "command": "java",
      "args": [
        "-jar",
        "/path/to/LSP4J-MCP/target/lsp4j-mcp-1.0.0-SNAPSHOT.jar",
        "/path/to/your/java/project",
        "jdtls"
      ],
      "env": {
        "LOG_FILE": "/tmp/lsp4j-mcp.log"
      }
    }
  }
}

Comparison generated from public README + GitHub signals. Last updated automatically.