Minecraft Snapshot 20w51a Server Jar Download

Version facts

What changed

Newest upstream commits:

• #1 · 16 Dec 2020 Added the axolotl!
• Amphibious!
• Axolotls currently love tropical fish, though this may change. Tropical fish or tropical fish buckets can be used to mate axolotls
• Axolotls will swim around with you if you're holding a tropical fish or tropical fish bucket in one of your hands
• When a player kills a mob that the axolotl was attacking or being attacked by, the axolotl will show its appreciation by granting the player temporary regeneration and removing any mining fatigue effects

Compatibility

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

Players need a Minecraft: Java Edition Snapshot 20w51a client on the same version.

Minecraft Snapshot 20w51a 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 20w51a

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 20w51a
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 20w51a
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=20w51a --name mc itzg/minecraft-server

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

Upgrading

• Newer: Minecraft 1.16.5 Release Candidate 1
• Previous: Minecraft Snapshot 20w49a
• How to update a Minecraft server safely