Minecraft Snapshot 21w07a Server Jar Download

Version facts

What changed

Newest upstream commits:

• #1 · 17 Feb 2021 Added Grimstone!
• Like Blackstone, Grimstone can be used to craft basic tools, furnaces and brewing stands.
• You can craft the following blocks with this new stone type: Grimstone Slab Grimstone Stairs Grimstone Wall Polished Grimstone Polished Grimstone Slab Polished Grimstone Stairs Polished Grimstone Wall Grimstone Bricks Grimstone Brick Slab Grimstone Brick Stairs Grimstone Brick Wall Grimstone Tiles Grimstone Tile Slab Grimstone Tile Stairs Grimstone Tile Wall Chiseled Grimstone
• Grimstone Slab
• Grimstone Stairs

Compatibility

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

Players need a Minecraft: Java Edition Snapshot 21w07a client on the same version.

Minecraft Snapshot 21w07a 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 21w07a

1. Install Java 8 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 21w07a
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 8 ] 2>/dev/null; then
  echo "Java 8 or newer is required (found Java $JAVA_MAJOR)."
  exit 1
fi
java -Xms4G -Xmx4G -jar server.jar nogui

@echo off
REM start.bat — Minecraft 21w07a
REM Needs Java 8 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=21w07a --name mc itzg/minecraft-server

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

Upgrading

• Newer: Minecraft Snapshot 21w08a
• Previous: Minecraft Snapshot 21w06a
• How to update a Minecraft server safely