MCP Java SDK — MCP Protocol

Official SDK for building MCP servers and clients in Java

Basic information

What is this program?

This is the official SDK for developers who want to build MCP servers in Java. It provides type-safe abstractions for MCP's core primitives (tools, resources, and prompts).

This SDK runs on Java 17 or later and supports both stdio and Streamable HTTP transports. You can naturally add MCP capabilities to an existing Java codebase.

What problems does it solve?

• ('In Java projects', 'When you need to implement an MCP server or client', 'Ensure protocol compliance with official primitives')
• ('Type safety', 'When you need to prevent incorrect protocol usage at compile time', 'Catch mistakes early through the type system')
• ('Multiple transports', 'When you need to support both local stdio and remote HTTP', 'Choose the transport that fits the deployment environment')

Key features

Server implementation

Server API for registering tools, resources, and prompts

• Use case: Expose external tools through MCP
• Result: Type-safe server definition
• Limitation: Requires learning the protocol

Client implementation

Client API for connecting to MCP servers

• Use case: Call servers from an agent
• Result: Connect over the standard protocol
• Limitation: Requires authentication setup

Transport layer

Built-in stdio and Streamable HTTP transports

• Use case: Support both local and remote deployments
• Result: Deploy without changing transports
• Limitation: Requires CORS and authentication for remote use

Installation and execution

Maven:

Install with the Java package manager.

Maven: io.modelcontextprotocol.sdk:mcp

Real-world usage examples

Starting the server

mvn exec:java

Runs the MCP server over stdio.

Advantages and limitations

Advantages

• Official MCP project, ensuring protocol compliance
• Idiomatic Java development patterns
• Multiple transport support

Considerations before use

• Requires a Java runtime
• Timing of 2026 specification support varies by SDK

Comparison with similar programs

Official resources and further learning

• Official homepage — https://modelcontextprotocol.io/docs/sdk
• Official documentation / knowledge base — https://github.com/modelcontextprotocol/java-sdk-sdk
• Installation & distribution — Maven: io.modelcontextprotocol.sdk:mcp
• Release notes — https://github.com/modelcontextprotocol/java-sdk-sdk/releases
• Source / development resources — https://github.com/modelcontextprotocol/java-sdk-sdk

Version and supported environment information was confirmed on the official site as of 2026-10-18. Installation commands may vary depending on the distribution and version you use, so check the official installation documentation as well.

Actual execution screen

Synthetic example — not an actual execution result. The screen is a synthetic example and not an actual execution result.

!MCP Java SDK usage example

A server in actual operation

Source (HTML): https://games.aidebatehub.com/programs/mcp/protocol/java-sdk.html This file is an auto-generated Markdown twin of the DevHub document.