SpongeVanilla 1.21.11 Pre-Release 2 Server Jar Download

Also known as Sponge.

Experimental — pre-release Official source

SpongeVanilla 1.21.11 Pre-Release 2 build 1.21.11-pre2-18.0.0-RC2451 is the latest SpongeVanilla build for Minecraft 1.21.11 Pre-Release 2, published on 21 Nov 2025. It requires Java 21 or newer and the jar is 8.2 MB.

Download

Download spongevanilla-1.21.11-pre2-18.0.0-RC2451-universal.jar8.2 MB

Downloads from repo.spongepowered.org — Official — SpongePowered.

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Version facts

Minecraft release date	21 Nov 2025
This build's date	21 Nov 2025
Build	1.21.11-pre2-18.0.0-RC2451
Channel	Preview (pre)
Required Java	Java 21 or newer · Temurin 21
File size	8.2 MB
Licence	MIT
Upstream project	spongepowered.org

What changed

Newest upstream commits:

#1.21.11-pre2-18.0.0-RC2451 · 21 Nov 2025 feat(minecraft): update to 1.21.11-pre2

What's new in Minecraft 1.21.11 Pre-Release 2 (Minecraft Wiki)

Compatibility

Runs Sponge plugins built for the matching SpongeAPI version.

Players need a Minecraft: Java Edition 1.21.11 Pre-Release 2 client on the same version.

Minecraft 1.21.11 Pre-Release 2 in other server software

Snapshot Fabric Quilt

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.
Known issues: search SpongeVanilla's issue tracker for 1.21.11-pre2

How to set up SpongeVanilla 1.21.11 Pre-Release 2

Install Java 21 or newer (e.g. Eclipse Temurin) and check it with java -version.
Download the SpongeVanilla jar into an empty folder.
Start it once with the script below; it creates eula.txt and stops.
Set eula=true in eula.txt to accept the Minecraft EULA, then start again. Players join on port 25565.

Linux / macOS — `start.sh`

#!/bin/sh
# start.sh — SpongeVanilla 1.21.11-pre2
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 21 ] 2>/dev/null; then
  echo "Java 21 or newer is required (found Java $JAVA_MAJOR)."
  exit 1
fi
java -Xms4G -Xmx4G -jar spongevanilla-1.21.11-pre2-18.0.0-RC2451-universal.jar nogui

Windows — `start.bat`

@echo off
REM start.bat — SpongeVanilla 1.21.11-pre2
REM Needs Java 21 or newer: run "java -version" to check.
java -Xms4G -Xmx4G -jar spongevanilla-1.21.11-pre2-18.0.0-RC2451-universal.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=SPONGEVANILLA -e VERSION=1.21.11-pre2 --name mc itzg/minecraft-server

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

Upgrading

FAQ

What Java version does SpongeVanilla 1.21.11 Pre-Release 2 need?

SpongeVanilla 1.21.11 Pre-Release 2 needs Java 21 or newer. Running it on an older Java fails with an UnsupportedClassVersionError mentioning class file version 65.0.

Is SpongeVanilla 1.21.11 Pre-Release 2 safe for my survival world?

Only on a copy. Preview versions are experimental and upgrade worlds irreversibly; keep a backup and don't switch a live world to a snapshot, pre-release or release candidate.