Start Server with Custom JAR in Minecraft

Using a custom JAR to start a Minecraft server allows for a tailored and optimized server environment. Custom JARs are modified server software files that include specific configurations, plugins, and optimizations that suit a server owner's preferences or gameplay style.

By utilizing a custom JAR, server administrators can fine-tune performance, integrate desired gameplay features through plugins, and ensure compatibility with specific mods or modpacks. This approach offers greater control over the server's functionality, enabling a more customized and efficient experience for both the server operator and the players who join the server.

Here we explain how to start a Minecraft server from Custom JARs.  This will allow the ability to use platforms such as Paper, Forge, Spigot, etc. This guide will cover setting up and using any JAR file on your Minecraft server.

Start Server with Custom JAR

1. Log into the Game Management Panel
2. Locate and double-click the Minecraft Instance
3. Click Stop and wait for the server to come to a full stop before proceeding
   
4. Navigate using the menu on the left side of the screen to the Configuration section
   
5. Click on the Server Settings option
   
6. On this screen, you will have three sections that will allow you to select the Server/JAR type and version of your choice
   IMPORTANT: In the case that you need to manually upload a JAR file or the JAR type you are looking for is not present when selecting in the steps below, use the method to Manually Upload a JAR File in the section listed at the bottom of this article. Afterward, you will need to reference Step 6.C to select the JAR for server start-up.
   
   1. Navigate to the Server Type section
   2. Select the type of server we are looking to host
      NOTE: For this example, we selected Forge.
      
      
   3. Specify the version you want to use
      
   4. Go back to the Server Type section and click the Download/Update button
   5. Proceed to select the new JAR from the Server JAR selection tool
      
      IMPORTANT: If the JAR file of your choice is not showing up within the Server JAR tool,
      you may need to update the list by utilizing the Scan for New JARs button.
      
7. After the JAR file is selected, check the JAR provider’s documentation to confirm what version of Java it requires
8. Confirm that the version is set
   1. Navigate to the Configuration menu
   2. Click the Java and Memory section
      
   3. Under Java Version, select the Java version you need
      
9. Navigate to the Console
   
   
10. Start the Minecraft Server
    
    IMPORTANT: If you had a prior world present from a different version or JAR type, you may need to rename or remove that world in order to allow your server to generate a new world and start properly.
    TIP: JARs, mods, and plug-ins come in various shapes and sizes. Some will require more resources than others. Please review their documentation for the recommended resource requirements to confirm if this is the correct Minecraft Server Hosting plan.

Manually Upload a JAR File

1. Upload the JAR file to the server via the File Manager or SFTP
2. Use the Download Here tool in the AMP Game panel
   1. Navigate to the File Manager
   2. Right-click to get the menu below
      
   3. Click the Download file here button and paste in the direct URL of the JAR file
   4. Click OK
      
      
      IMPORTANT: Once the JAR file is on the server, proceed back to Step 6.C in the Start Server with Custom JAR section above to finish the server setup process.