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Can I run a custom .JAR file on my Minecraft server?

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Yes, absolutely! We allow any mod you wish to run on your Minecraft server.

The easiest way to change what your server runs is the Mods tab of your server in the control panel. Under Change software, choose Vanilla, Paper, Purpur, Fabric, Quilt, Forge or NeoForge and the Minecraft version you want, and the panel installs it with the right Java version. Modpacks from CurseForge and Modrinth install from the same tab.

Using your own JAR file

The server starts server.jar when the Mods tab shows Vanilla, Paper or Purpur. If it shows Fabric, Quilt, Forge or NeoForge, the server starts that loader's own files instead: first install Vanilla for the same Minecraft version under Change software, then follow these steps.

  1. Download the server JAR you want and rename it to server.jar.
  2. Sign in to the control panel at panel.chicagoservers.co and open your Minecraft server and click Stop.
  3. Open the Files tab and upload server.jar, replacing the one that's there. You can also upload it over SFTP (see How to connect to your server's SFTP).
  4. Click Start. The server starts with your JAR. Watch the Console tab to check it starts.

Keep your JAR: clicking Update at the top of the server's page, or installing server software on the Mods tab, downloads the panel's server software again and replaces your server.jar. Upload your JAR again afterwards.

Java: on Automatic, the panel checks your JAR before each start and uses the Java version it needs. To pick one yourself, choose it under Java on the Mods tab and click Save.

Need help? Open a support ticket and we'll take a look.


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