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LSP4J

Verified Integration
Author: @stephanj•Category: ServerApplication
GitHub Repository
JSON-RPC 2.0
Protocol Standard
Sub-second
Execution Latency
Active
Operational Status
Tags:#Claude#Search#Database#API#Git#Filesystem#AI#GitHub#Node.js

Client Configuration

— Connect LSP4J to Claude Desktop or Cursor in seconds
{
  "mcpServers": {
    "lsp4j": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-lsp4j"
      ],
      "env": {}
    }
  }
}
Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows).
Architecture & Capabilities

System Overview

Integrates Eclipse JDT Language Server (JDTLS) capabilities to empower AI assistants with advanced Java IDE features via the Model Context Protocol.

Indexed Date

7/23/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for LSP4J

LSP4J provides critical developer tools such as searching for Java symbols (classes, methods, fields), finding all references to a specific code location, navigating to symbol definitions, listing all symbols within a file, and identifying interfaces containing a method with a given name.

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