MCP Server Howto
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MCP Server Howto

The ModelContextProtocol (MCP) Java SDK is a standardized protocol implementation for communication between AI models and external tools or resources. It provides Java development toolkits for both clients and servers, supports synchronous and asynchronous operations, and includes functions such as resource management, tool invocation, and error handling.
2 points
8.7K

What is the MCP Java SDK?

The MCP Java SDK is a standardized protocol implementation for building interactions between AI models and external systems. It allows Java applications to create MCP servers to expose tools and resources to AI models, and also create clients to communicate with these servers.

How to use the MCP Java SDK?

Using the MCP Java SDK mainly involves three steps: 1) Add Maven dependencies. 2) Create client or server instances. 3) Implement business logic. The SDK provides both synchronous and asynchronous operation modes.

Applicable Scenarios

The MCP Java SDK is suitable for scenarios where AI models need to be integrated with external systems, such as AI assistants calling external APIs, AI models accessing databases, and AI systems using external tools.

Main Features

Client Implementation
Provides both synchronous and asynchronous client implementations, supporting resource access and tool invocation.
Server Implementation
Supports both synchronous and asynchronous servers, which can expose resources and tools for clients to use.
Multiple Transport Modes
Supports multiple transport mechanisms such as standard I/O, and can be extended with custom transport implementations.
Resource Management
Supports both static and dynamic resources, and resource content can be accessed through URI pattern matching.
Tool Framework
Provides a complete tool invocation framework, supporting parameter validation and result return.
Error Handling
A standardized error handling mechanism that provides clear error codes and messages.
Advantages
Standardized protocol to ensure interoperability between different systems
Supports both synchronous and asynchronous modes to meet different scenario requirements
Modular design for easy extension and customization
A complete error handling mechanism
Rich documentation and sample code
Limitations
Currently only supports Java language implementation
Requires certain Java development experience to make full use of it
The asynchronous mode requires an understanding of reactive programming concepts

How to Use

Add Maven Dependencies
Add the MCP SDK dependency to the project's pom.xml file.
Create a Client
Use the McpClient factory class to create a synchronous or asynchronous client instance.
Create a Server
Use the McpServer factory class to create a synchronous or asynchronous server instance.
Implement Business Logic
Implement business logic such as resource handlers and tool handlers according to requirements.

Usage Examples

Code Analysis Tool
Create a code analysis tool that receives code snippets and returns analysis results.
User Data Resource
Create a dynamic resource that returns user data based on the user ID.
Calculator Tool
Create a simple calculator tool to perform basic arithmetic operations.

Frequently Asked Questions

What transport modes does the MCP Java SDK support?
How to extend the SDK to add custom features?
What's the difference between synchronous and asynchronous modes?
How to handle errors on the server side?
What are the limitations of resource URIs?

Related Resources

MCP Specification Document
The official specification document of the Model Context Protocol
MCP Java SDK Documentation
The official documentation of the MCP Java SDK
GitHub Repository
The source code of the MCP Java SDK
Sample Code
Sample code for various usage scenarios

Installation

Copy the following command to your Client for configuration
Note: Your key is sensitive information, do not share it with anyone.

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