Compatibility
What works with Minecraft 1.2.1
Released 29 Feb 2012. Everything below comes from the projects' own published data, and each row says how we know.
Java requirement
Java 8 or newer
Published by Mojang for this exact version. An older runtime will not start it. Get a verified build.
Server software with builds
Real, downloadable builds for 1.2.1.
Mod loaders
Support declared in each loader's own metadata.
- NanoLimbo1.2.1inferredsupported
Clients that can join
Protocol 28 is shared with these versions, so they can connect without a translation proxy.
Frequently asked
Which Java version does Minecraft 1.2.1 need?
Java 8 or newer. Mojang publishes this requirement in the version metadata, so an older runtime will refuse to start the server.
Which Minecraft versions can connect to a 1.2.1 server?
Any client speaking protocol 28: 1.2.3, 1.2.2. Versions with a different protocol number need a translation proxy such as ViaVersion.
Which server software supports 1.2.1?
NanoLimbo publish builds for 1.2.1.