Pure Java 21 MCP Server

@aliaksandr-haurylau-godel

Repository

Basic information

About Pure Java 21 MCP Server

No overview available yet

#mcp-server #java-server#mcp-implementation

Pure Java 21 MCP Server config

No standard config provided

This server doesn't expose a parseable MCP config block in its README. See the repository for install instructions.

Repository

Pure Java 21 MCP Server tools

Tool list not available yet

This listing does not currently have a tool list to display. This does not mean the server has no tools; check its documentation for supported capabilities.

We auto-extract tools from the README. The maintainer can list them under a ## Tools heading to populate this section.

Overview

What is Pure Java 21 MCP Server?

An implementation of a Model Context Protocol (MCP) server written in pure Java 21, built from scratch without external MCP-specific SDKs. It uses STDIO transport with Content-Length framed JSON-RPC messages and is intended for developers who need a lightweight, Java-native MCP server.

How to use Pure Java 21 MCP Server?

Ensure Java 21 and the Gson library JAR are available. Place the Gson JAR in a lib directory, compile all Java sources into bin, then run the server using java -cp "bin:lib/gson-2.10.1.jar" io.modelcontextprotocol.server.Main. The server listens for JSON-RPC messages on standard input.

Key features of Pure Java 21 MCP Server?

Pure Java 21 implementation with no external MCP SDKs
STDIO transport with Content-Length header framing
Implements initialize, initialized, shutdown, and exit lifecycle
Provides a single tool: echoTool (echoes a message)
Logging to file (mcp-server.log) and console

Use cases of Pure Java 21 MCP Server?

Testing MCP client-server communication over STDIO
Demonstrating tool-calling with a simple echo tool
Validating MCP protocol implementation in Java
Lightweight integration into Java applications requiring MCP

Frequently asked questions

What are the prerequisites for Pure Java 21 MCP Server?

Java 21 SDK and the Gson library JAR (e.g., gson-2.10.

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