JavaLens

local MCP server

Installation

Terminal

claude mcp add javalens -e JAVA_PROJECT_PATH=... -e JAVALENS_TIMEOUT_SECONDS=... -e JAVALENS_LOG_LEVEL=... -- npx -y javalens-mcp

Run in your project folder. Add --scope user to use it everywhere.

Claude Desktop, Cursor & other clients

Add to claude_desktop_config.json or .cursor/mcp.json.

{
  "mcpServers": {
    "javalens": {
      "command": "npx",
      "args": [
        "-y",
        "javalens-mcp"
      ],
      "env": {
        "JAVA_PROJECT_PATH": "...",
        "JAVALENS_TIMEOUT_SECONDS": "...",
        "JAVALENS_LOG_LEVEL": "..."
      }
    }
  }
}

Fill in the environment variables with your own credentials.

Summary

63 semantic Java analysis tools via Eclipse JDT: navigation, refactoring, code intelligence.

Questions

JavaLens is a local MCP server distributed as the npm package javalens-mcp.

Run: claude mcp add javalens -e JAVA_PROJECT_PATH=... -e JAVALENS_TIMEOUT_SECONDS=... -e JAVALENS_LOG_LEVEL=... -- npx -y javalens-mcp

Run: codex mcp add javalens --env JAVA_PROJECT_PATH=... --env JAVALENS_TIMEOUT_SECONDS=... --env JAVALENS_LOG_LEVEL=... -- npx -y javalens-mcp

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