SlimefunCore 4.0 — Minecraft 26.x Release 🚀

What's New

🎮 Minecraft 26.x Support

SlimefunCore now exclusively targets Minecraft 26.x — the new generation of Minecraft using the modern year.drop.hotfix versioning scheme.

• ✅ Minecraft 26.1 (March 2026)
• ✅ Minecraft 26.1.1 / 26.1.2 (April 2026 hotfix)
• ✅ Minecraft 26.2 "Chaos Cubed" (June 2026 — current stable)
• ✅ Future-proof — automatically compatible with 26.3+ and beyond via open-ended version matching

Note: Minecraft 1.21.x support has been fully dropped. This is a clean replacement, not multi-version.

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🗄️ New Storage & Database System

A completely redesigned storage backend that replaces the legacy flat-file system:

• Modern database architecture — scalable and reliable data persistence
• Multi-backend support — flexible storage options for servers of all sizes
• Improved data integrity — safer block data, player profile, and inventory handling
• Seamless migration — existing world data is automatically converted on first load

New Storage Commands (/sf storage)

Administer and monitor the database directly in-game:

• /sf storage info — View current provider, connection status, ping, and connection pool size
• /sf storage stats — View cache statistics (hit rate, entries, evictions)
• /sf storage status — One-line health summary
• /sf storage verify — Run a schema integrity check to find missing columns/tables
• /sf storage repair — Automatically repair missing schema columns
• /sf storage cache clear — Invalidate cached data for online players
• /sf storage backup [create|list|restore|delete|verify] — Fully integrated database backup manager

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☕ Java 25 Support

Built and tested against JDK 25 (Eclipse Adoptium) — fully compatible with the latest Java runtime.

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🔧 Paper 26.x API Modernization

Under-the-hood updates to align with the latest Paper API:

• Migrated to Component-based events (Adventure API)
• Adopted DamageSource builder for modern damage events
• Switched to Registry.BIOME lookups (replacing deprecated Biome.valueOf)
• Updated potion system to setBasePotionType (replacing removed PotionData)
• Modernized WorldEdit & mcMMO integration hooks

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Requirements

Requirement	Version
Minecraft	26.1+ (any 26.x release)
Server	Paper 26.x (or forks: Purpur, Folia, etc.)
Java	21+ (25 recommended)

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Installation

1. Download the JAR from this page
2. Drop it into your server's plugins/ folder
3. Restart your server

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Setting up the New Database System

By default, Slimefun 4.0 uses the familiar legacy file-based system to ensure backward compatibility and prevent unexpected migrations. To switch to the new database system, follow these steps:

1. Stop your server.
2. Open plugins/Slimefun/database.yml in your text editor.
3. Change the provider setting from legacy to your preferred database type (e.g., sqlite, mysql, mariadb, postgresql).
   • For sqlite, no additional configuration is needed.
   • For mysql/mariadb/postgresql, fill in the host, port, username, and password in the same file.
4. Start your server.
5. Slimefun will automatically connect to the database, initialize the tables, and seamlessly migrate your existing world data on the first load!

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⚠️ Breaking Change: This release does NOT support Minecraft 1.21.x or earlier. If you're running an older server, stay on the previous release.