Monday, 27 July 2026

MCP Server Setup Using Java | Build Your First MCP Server from Scratch

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Introduction to MCP Servers

Imagine you have an AI assistant that you want to read files, access databases, or connect to your company systems. How can it do this safely? That is where an MCP (Model Context Protocol) Server comes in!

An MCP server acts like a secure librarian for AI, providing the tools and data services needed to interact with the real world.

Why Use Java for MCP?

Java is a top choice for building these servers because it is:

Stable & Secure: Trusted by big banks and airlines.
Fast: Handles large-scale data efficiently.
Enterprise-Ready: Most corporate systems already run on Java, making integration easy.

What You Need to Get Started

JDK (Java Development Kit): Recommended version 17 or 21.
IDE: Use IntelliJ IDEA (beginner-friendly), VS Code, or Eclipse.
Maven: To manage your libraries automatically.

Step-by-Step Guide to Build Your Server

Step 1: Create a Spring Boot Project

We use Spring Boot because it's like a ready-made engine that helps us build backend applications very quickly.

Step 2: Add Dependencies

You will need the Spring Web dependency. This allows your server to handle web requests (APIs).

Step 3: Create the Main Application

Define your main class with the @SpringBootApplication annotation. This is the entry point where everything starts.

Step 4: Create a Simple Controller

A controller is what "listens" for requests. When someone visits your server URL, the controller decides what message to send back.

Step 5: Run and Test

Run your application and visit http://localhost:8080 in your browser. You should see your first MCP-style server response!

Real-Life Example

If an employee asks an AI, "How many people work in our company?", the AI doesn't know the answer alone. It asks the MCP Server, which checks the HR database and returns the exact number. Now, the AI can give a perfect answer!