Compatibility
What works with Minecraft 18w21b
Released 25 May 2018. 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
No server software in our catalogue has published a build for 18w21b. For a snapshot that is normal: server projects usually wait for the full release.
Frequently asked
Which Java version does Minecraft 18w21b need?
Java 8 or newer. Mojang publishes this requirement in the version metadata, so an older runtime will refuse to start the server.
Which server software supports 18w21b?
No server software in our catalogue has published a build for 18w21b yet.