Minecraft has exploded into one of the most popular games of all time, with over 300 million copies sold and a vibrant online multiplayer ecosystem. If you’ve heard of MCP servers but aren’t quite sure what they are or how to set one up, you’re in the right place.
In this guide, we’ll explore everything about MCP servers, how they differ from regular Minecraft servers, and provide a comprehensive tutorial to set one up from scratch — even if you’re new to server hosting.
What is an MCP Server?
MCP stands for Minecraft Coder Pack. It’s a toolkit primarily used by developers and modders to decompile, edit, and recompile Minecraft’s source code. An MCP server, then, refers to a custom or modded Minecraft server built using the MCP framework. These servers are ideal for:
- Running custom game logic
- Enabling mods that change core mechanics
- Creating unique gameplay experiences not available on vanilla Minecraft servers
Unlike standard Bukkit, Spigot, or Forge servers, MCP servers often involve a deeper level of customization and require working with Minecraft’s decompiled source code.
Who Should Use an MCP Server?
You should consider setting up an MCP server if:
- You want full control over Minecraft’s game mechanics
- You’re developing your own modded Minecraft experience
- You have Java programming experience
- You’re building a custom minigame, RPG world, or unique plugin
For regular users or modders who want easy server management, Forge or Paper might be easier options. But for advanced developers, MCP offers unmatched flexibility.
Tools & Requirements to Set Up an MCP Server
Before diving in, make sure you have the following:
| Requirement | Details |
|---|---|
| Minecraft Java Edition | Preferably version 1.12.2 or older (latest MCP versions don’t always support new releases) |
| Java JDK | Java Development Kit 8 or higher |
| Python 2.7 | MCP uses Python scripts to run recompile/decompile tasks |
| Windows, macOS, or Linux | Cross-platform support, but command-line experience helps |
| Basic Java skills | You’ll be editing Minecraft’s source code |
Step-by-Step: How to Create an MCP Server
Step 1: Download the MCP Toolkit
Visit https://mcp-reborn.readthedocs.io or search for the latest MCP Reborn release. This is the most active fork of MCP for modern versions of Minecraft.
- Download the appropriate version (recommended: 1.12.2 for stability).
- Extract the ZIP file into a clean directory (e.g.,
C:\MCPWorkspace).
Step 2: Set Up Your Environment
- Install Java JDK
- Download from: https://www.oracle.com/java/technologies/javase-downloads.html
- Set the
JAVA_HOMEenvironment variable.
- Install Python 2.7
MCP still depends on Python 2.7 for its scripts. - Verify installation
Run the following in Terminal (macOS/Linux) or Command Prompt (Windows):java -version python --version
Step 3: Decompile Minecraft Source Code
Inside your MCP folder:
- Download the official Minecraft client and server
.jarfiles and place them into thejars/directory. - Run the decompile script:
- Windows:
decompile.bat - macOS/Linux:
./decompile.sh
- Windows:
This may take a few minutes. If successful, MCP will generate a src/ directory with the decompiled Minecraft code.
Step 4: Modify the Minecraft Code
Now comes the fun part.
- Navigate to
/src/minecraft/net/minecraft/ - Open Java files using an IDE like IntelliJ IDEA or Eclipse
- Make your desired modifications (e.g., change block behaviors, add custom entities, alter gameplay rules)
🧠 Tip: Always test your changes incrementally and back up the original files.
Step 5: Recompile the Code
After editing:
- Run the recompile script:
./recompile.sh # or recompile.bat for Windows - Fix any compilation errors (common if syntax is off or imports are missing)
Once complete, you’ll find your compiled .class files in the bin/ folder.
Step 6: Reobfuscate and Build the Server
- Run the reobfuscation script:
./reobfuscate.sh - Your compiled and obfuscated files will be ready to be packaged with the Minecraft server.
- Drop your
.classfiles into the original server.jaror use a custom class loader.
Step 7: Run Your MCP Server
Now you can:
- Launch the modified
minecraft_server.jaras usual - Test your changes and tech.
- Invite players by sharing your IP (use port forwarding or third-party hosting)
To run:
java -Xmx2G -Xms1G -jar minecraft_server.jar nogui
Bonus Tips for MCP Server Creators
- Version Compatibility: MCP isn’t updated as frequently as Forge, so always check mod compatibility.
- Use Git: Track changes in your Minecraft code using Git for easy rollbacks.
- Host on Linux VPS: For public use, deploy the server on a cloud host like DigitalOcean or AWS Lightsail.
- Legal Note: Modifying Minecraft’s code violates the EULA if redistributed. Use MCP servers for personal or educational use.
Final Thoughts
Setting up an MCP server is not for the faint-hearted, but it’s one of the most rewarding ways to create a fully customized Minecraft experience. Whether you’re building a mod, experimenting with AI mobs, or crafting a totally new game mode — MCP gives you root-level access.
If you’re looking for simpler alternatives for modded servers, consider:
- Forge (for modpacks)
- Fabric (lightweight mod loader)
- Spigot/Paper (for plugins)
But for deep-level modifications and learning how Minecraft works under the hood — MCP is your playground.
FAQs about MCP Servers
Is MCP still supported for the latest Minecraft versions?
Not officially. Most MCP builds support Minecraft 1.12.2 and below. For newer versions, use MCP Reborn or Fabric.
Can I run MCP servers with plugins?
Not in the traditional Bukkit/Spigot sense. MCP changes the game at the source code level. For plugin support, consider Paper or Sponge.
Is this suitable for multiplayer servers?
Yes, but only for controlled environments where you know the code is secure. It’s not recommended for large public servers unless thoroughly tested.
