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A simple and lightweight Minecraft limbo server.

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Limbo

A simple and lightweight Minecraft limbo server.
Usually used in a network of servers to host a large amount of players at a low CPU cost. (Queue/fallback server)

Currently implemented:

  • Spawning in a void world
  • Server list ping

To Do

  • World loading from a schematic file. (shouldn't be too difficult for 1.8.x)
  • Bungeecord IP forwarding (wouldn't really do much)
  • Support more versions

Minecraft Protocol Versions Supported

  • 5 (1.7.6-1.7.10)
  • 47 (1.8.x) (Base version)

1.12.2 support was attempted, but when sending the join game packet my client would disconnect and I haven't been able to fix it.
PRs to support more versions are welcome.
You may also be able to run ViaVersion on your proxy to support newer versions, I haven't tested this though.

Usage

Just download the latest release and run it with Java, a configuration file will be created and you may edit it as you wish.
Note: To run the server with a specific port without editing the configuration file (useful for deploying on a cloud system) just set the first argument to a port. Example: java -jar Limbo.jar 25566 will run the server on port 25566.
To compile it yourself just run mvn package.

Native Builds

Making native builds with GraalVM is supported and recommended.
Native builds come with a much faster startup time (from 2 seconds to 3ms for me), as well as less overall CPU usage.

Just install GraalVM and the native-image component and run native-image -jar <limbo jar file>.jar and you can run the server using ./Limbo.