
SlimefunCore
Custom unofficial Slimefun core build for Paper/Purpur 1.21.11 with Java 21 support, compatibility fixes, modern startup support, and stable loading for updated SF4 addons.
SlimefunCore4 Changelog
New Features & Improvements
Cargo Grid Monitor System (new)
- Added a new Cargo Grid Monitor GUI for Cargo Manager.
- Added item categories for easier browsing.
- Added search support for item names, materials, and Slimefun IDs.

Automatic Server Version Detection
- Added automatic Minecraft server version detection.
- Improved compatibility checks for supported server versions.
- Reduced manual setup required for server owners.
Automatic Compatible Slimefun Updates
- Improved Modrinth update checking.
- Added compatible-build selection based on server version.
- Added safer update validation before installing builds.
- Added cache fallback so startup stays safe if the API is unavailable.
Improved Console Logging
- Added clear loading steps for services, items, resources, addons, tasks, and integrations.
- Improved startup diagnostics while keeping warnings/errors safe and visible.
SlimefunCore4 — Changelog
Build 2670 — 2026-05-19
🟢 Addon Manager
- Multi-version addon URLs via
addons.<key>.versionsper SF4 build tag - Auto-detects server Minecraft version on startup, shows only compatible addons
- Version-specific cloud-sync URL support via
cloud-sync.version-urls /addon listshows server version, active build tag, and hidden addon count- Old single-URL config format still works — automatically upgraded on load
- Remote sync no longer overwrites local
enabled/downloadtoggles
🔵 Safety
- Addon JARs only deleted when explicitly disabled or removed via command
- Deletion queue, addon logs, and config backups kept across restarts
🟡 World Backup
- New
WorldBackupService— backs upworld,world_nether,world_the_endon shutdown - Skips live lock files, checks disk space before starting, auto-purges old backups
- Configurable via
slimefun.world-backupinconfig.yml
🔶 Dough Bridge Layer
- Added
io.github.thebusybiscuit.slimefun4.libraries.bridge— 13 wrapper classes (SF4Items,SF4Colors,SF4ItemUtils,SF4InvUtils,SF4Patterns,SF4BlockPos,SF4DataAPI,SF4ChatInput,SF4Vein,SF4PlayerUtils,SF4TaskQueue,SF4Config,SF4Collections) - 144 internal call sites migrated to bridge — future Dough updates touch 13 files, not hundreds
- Public API and storage types kept as direct Dough imports for addon compatibility
- No gameplay or behaviour changes
- Multi-version addon URLs via
Quick fix sha256 wrong
Fail all 3 attempts after Attempt 1 fails attempt 2 skips SHA, succeeds — logs real hashAddon Manager
Build 2647
What's New
- Dynamic addon list showing cloud-managed and manually installed addons
- Status overview with managed, loaded, and unmanaged addon counts
- Smarter GitHub jar selection — matches by addon name first
- Managed addon detection now reads directly from the jar's
plugin.yml - Fallback flags for remote sync are now fully respected
New Commands
/sf addon list— lists all addons (managed + installed)/sf addon status— shows addon counts and sync state/sf addon sync— manually trigger a cloud config sync/sf addon enable <name>— enable a managed addon/sf addon disable <name>— disable a managed addon/sf addon update <name>— update a specific addon/sf addon download <name>— download a managed addon/sf addon remove <name>— remove a managed addon
Changelog
- improve performance
- fixed critical bug
🚀 SlimefunCore4 v2621
A stability-focused update with major storage improvements, Android system upgrades, and multiple critical fixes.
✨ Highlights
🧠 New Storage System (Major Upgrade)
- Introduced a modular storage architecture
- Added SQLite backend support
- Implemented async save queue & caching
- Added data consistency checker & migration system
- Improved overall performance and reliability
🔒 Storage Improvements
-
Moved storage logic away from risky bootstrap path
-
Added atomic file saving (prevents corruption)
-
Fixed research data issues
-
Added validation systems:
- Research validation
- Backpack size checks
-
Improved safety:
- Null-safe item loading
- Optional-based lookups
- Immutable data views
- Dirty flag tracking per section
🤖 Android System Upgrades
-
Added bad-data recovery system
-
New Android GUI status panel:
- Running / Paused / Error states
- Step progress tracking
- Current command display
- Fuel buffer info
- Facing direction
- Last error reporting
📜 Script System Fixes
- Fixed script rating system
- Improved script sorting
- Fixed script browser page issues
🧩 Developer Changes
-
Added new storage components:
- StorageException
- StorageSaveQueue
- StorageCache
- StorageFactory
- StorageConsistencyChecker
- StorageMigrator
- SQLiteStorage
⚠️ Notes
- This is an experimental but stable build
- Storage system is now future-ready and extensible
- Recommended to backup data before upgrading
💬 This update focuses on making your server safer, faster, and more scalable while preparing for future features.
Нет описания изменений
Slimefun 4.9-UNOFFICIAL
Modified Version
Slimefun is a plugin which turns your Minecraft server into a modpack without installing mods. It adds a huge amount of content including advanced technology, powerful magic, machines, and full automation systems.
This is an unofficial modified version of the original project, maintained and updated by R2Ksanu.
** Original Repository: https://github.com/Slimefun/Slimefun4**
Status Update
- Original version: 1.19.4
- Updated to: 1.21.11
- Compatibility: :white_check_mark: Working
- Status: :test_tube: Currently under testing
- Tested on: Purpur 1.21.11 (Java 21)
This build is still under testing and may contain bugs. Feedback and bug reports are highly appreciated!
Future Update
Upcoming Slimefun community addons will also be updated for Minecraft 1.21.11 to work together with this main core build.
The goal is to keep the wider Slimefun addon ecosystem usable on modern Purpur/Paper 1.21.11 servers.
:package: Updated Addons
URL :
https://github.com/rutwok-labs/SF4-AddonsAddon Status Notes Community Addons ⏳__ Upcoming Planned compatibility updates for 1.21.11Main Slimefun Core ✅ Updated Working on Purpur/Paper 1.21.11
Download
🔗 Link : Slimefun v4.9-UNOFFICIAL.jar
Note: This is an unofficial fork. Always test on a backup server before using on production.
🖼️ Screenshots
(Reused from the original project – showcasing the power of Slimefun)
Reactors & Electricity Awesome Factories Magic & Altars 


✨ What is Slimefun?
Slimefun adds:
- Advanced technology systems
- Magical items and crafting
- Machines and automation
- Over 500 custom items
The original project started in 2013 and has grown into a large community project with hundreds of contributors.
This unofficial version keeps the spirit alive while bringing full support for the latest Minecraft 1.21.11!
🧭 Quick Navigation
⚠️ Important Disclaimer
This is an unofficial fork and is not affiliated with the original Slimefun developers or team.
- All credits go to the original Slimefun Team.
- This project follows the GNU GPLv3 License.
- You are allowed to modify and share it, but you must give proper credit and keep the same license.
Original Project
Creator & Builder: TheBusyBiscuitTheBusyBiscuit · he/him
Original Project Team: Slimefun Team
Repository: https://github.com/Slimefun/Slimefun4
🤝🏻 Credits
- Original Project Creator: TheBusyBiscuit
- Original Project Team: Slimefun Team
- Modified & Updated by: R2Ksanu
- Screenshots: Courtesy of the original Slimefun community
📄 License
This project follows the GNU GPLv3 License.
See LICENSE for details.
Thank you for using Slimefun 4.9-UNOFFICIAL!
Enjoy your modpack-like experience on the latest Minecraft version! :tada:Made with ❤️ for the Minecraft community
