Lib 39

Lib 39

Lib39 is a general-purpose dependency library for Minecraft mods.

by
10.5K Downloads
fabricforgeneoforgelibrary
Rent Server with this Mod

About this Mod

A LIB

Current Library Features

  • S2C Synchronized Data System (Not only supports Capability but also enables synchronization of more data types through DataProvider)
  • I18n Language JSON Data Generation Code based on Provider (providing more convenient language data generation)
  • Compatibility Code Registration Management Class (for easier compatibility with other mods)
  • NBT Read/Write Utility Class using a chain pattern to reduce redundant serialization/deserialization logic
  • A Series of Riding Methods for more convenient management of riding relationships
    ...and a range of other utility methods aimed at reducing repetitive coding tasks.

For Developers

Add the Maven repository in your build.gradle:

repositories {
    maven {
        name = "LTD Maven"
        url = "https://nexus.bot.leisuretimedock.top/repository/maven-public/"
    }
}

Import the dependency:

implementation 'top.r3944realms.lib39:lib39:${version}'

Version examples like 1.20.1-0.0.17:

implementation 'top.r3944realms.lib39:lib39:1.20.1-0.0.17'

After building, this mod can be found in the library with examples included.

Click "Download Source Code" in the right-hand window to view JavaDoc annotations.

Available Versions

Lib 39 0.5.6release
MC 1.20.1forge
April 19, 2026
Lib 39 0.5.6release
MC 1.20.1fabric
April 19, 2026
Lib 39 0.4.1release
MC 1.20.1forge
February 26, 2026
Lib 39 0.3.6release
MC 1.20.1forge
February 17, 2026
Lib 39 0.1.9release
MC 1.20.1forge
January 24, 2026

How to Install Lib 39 on Your Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).

3

Install Mod

Open the mod browser in the dashboard and search for "Lib 39". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabricforgeneoforge

Minecraft Versions

1.21.11, 1.21.10, 1.20.1

Server-side

Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Lib 39 server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.

Is Lib 39 compatible with fabric and forge and neoforge?

Lib 39 officially supports fabric, forge, neoforge for Minecraft 1.21.11, 1.21.10, 1.20.1. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Lib 39 – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Lib 39 consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install Lib 39 with just one click on your server.

Recommended RAM
4 GBab €8/mo
Min. 3 GB | +1 GB pro 8 Spieler
Create Server Now
1-Click Mod Install
NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Required

Supported Versions

1.21.111.21.101.20.1