CraftTweaker Java Library
Java mod listed for Minecraft 1.20. File opened and checked on 8 Oct 2026; downloads from the MC Java Mods app on Android.
⬇ Download on CurseForgeThe author built this one for Minecraft 1.20.1 on Forge. On other versions it may install and then do nothing.
This mod was created in order to expand the capabilities of CraftTweaker for experienced users.
The mod offers java libraries for implementing more complex scenarios
The purpose of fashion
IO support
Network support
Asynchrony
Multithreading
And much more, but these are the initial tasks
Examples
Also, if you need to add specific functionality, you can write to me about it in my Discord
If you want to support me Boosty
MultiThread
val tread = thread.createTread(() => {
var i = 0;
while (i < 5000){
println("Thread 1: " + i);
i++;
}
});
thread.createRunThread(() => {
var i = 0;
while (i < 5000){
println("Thread 2: " + i);
i++;
}
});
tread.start();
Async
import stdlib.Exception;
import mods.ctjl.java.lang.ExecutionException;
import mods.ctjl.java.lang.InterruptedException;
var async_1 = async.supplyAsync(() => {
var i = 0;
println("Async 1 Start");
while(i < 2000){
println(i);
i++;
}
return 1;
});
var async_2 = async.runAsync(() => {
var i = 0;
println("Async 2 Start");
while(i < 2000){
println(i);
i++;
}
});
try {
async_1.getValue();
println("Async 1 End");
} catch ex as ExecutionException {
println(ex.toString());
} catch ex as InterruptedException {
println(ex.toString());
}
try {
async_2.getValue();
println("Async 2 End");
} catch ex as Exception {
println("Some Error");
println(ex.toString());
}- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.20.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as ctjl-1.20.1-1.0.0.jar — drop this file into the mods folder
- Download size: 26 KB
- Download link checked 27 Sept 2026 — working
These come from our own check of the pack file, not from the source page.