Minecraft Snapshot 21w41a Server Jar Download

Version facts

What changed

Newest upstream commits:

• #1 · 13 Oct 2021 The main menu backdrop now shows a Caves & Cliffs: Part II scene
• Badlands mineshafts generate higher up
• Geodes now only generate up to height 30 and their rarity has been adjusted to match 1.17 levels
• The angle at which sprinting against a block does not break your sprint has been increased a bit
• Changed the prioritization order of the chunk rendering pipeline Unrendered chunk holes in the world should not appear anymore while flying fast with high render distance

Compatibility

No plugins or mods — the unmodified game exactly as Mojang ships it (data packs still work).

Players need a Minecraft: Java Edition Snapshot 21w41a client on the same version.

Minecraft Snapshot 21w41a in other server software

Known issues & safety notes

• Preview builds are experimental: they can corrupt or irreversibly upgrade worlds, and most plugins and mods do not support them yet. Test on a copy of your world.

How to set up Minecraft Snapshot 21w41a

1. Install Java 16 or newer (e.g. Eclipse Temurin) and check it with java -version.
2. Download server.jar from Mojang (button above) into an empty folder.
3. Start it once with the script below; it creates eula.txt and stops.
4. Set eula=true in eula.txt to accept the Minecraft EULA, then start again. Players join on port 25565.

#!/bin/sh
# start.sh — Minecraft 21w41a
cd "$(dirname "$0")"
JAVA_MAJOR=$(java -version 2>&1 | awk -F'"' '/version/ {split($2, v, "."); print (v[1] == "1") ? v[2] : v[1]}')
if [ "$JAVA_MAJOR" -lt 16 ] 2>/dev/null; then
  echo "Java 16 or newer is required (found Java $JAVA_MAJOR)."
  exit 1
fi
java -Xms4G -Xmx4G -jar server.jar nogui

@echo off
REM start.bat — Minecraft 21w41a
REM Needs Java 16 or newer: run "java -version" to check.
java -Xms4G -Xmx4G -jar server.jar nogui
pause

Rule of thumb: 2–4 GB for a few friends, 6–10 GB for a public server with plugins. Set -Xms equal to -Xmx and leave 1–1.5 GB for the operating system. How much RAM?

Docker

docker run -d -p 25565:25565 -e EULA=TRUE -e TYPE=VANILLA -e VERSION=21w41a --name mc itzg/minecraft-server

Uses the community itzg/minecraft-server image, which downloads the file itself.

Upgrading

• Newer: Minecraft Snapshot 21w42a
• Previous: Minecraft Snapshot 21w40a
• How to update a Minecraft server safely