Crash: [16:00:40] [main / Info]: Extra: []

[16:00:40] [main/ERROR]: Failed to find class net.minecraftforge.fml . common.asm.transformers .ModAccessTransformer

[16:00:42] [main/INFO]: Running with arguments: [--userProperties, {}, --assetsDir, C:/Users/19077/.gradle/caches/minecraft/assets, --assetIndex, 1.12, --accessToken{REDACTED}, --version, 1.12.2, --tweakClass, net.minecraftforge.fml . common.launcher.FMLTweaker , --tweakClass, net.minecraftforge.gradle . tweakers.CoremodTweaker ]

[16:00:42] [main/INFO]: Loading tweak class name net.minecraftforge.fml . common.launcher.FMLTweaker

[16:00:42] [main/ERROR]: Unable to launch

java at net.minecraft.launchwrapper . LaunchClassLoader.findClass ( LaunchClassLoader.java:106 ) ~[launchwrapper-1.12.jar:?]

At java.lang.ClassLoader .loadClass( ClassLoader.java:418 ) ~[?:1.8.0_ 251]

At java.lang.ClassLoader .loadClass( ClassLoader.java:351 ) ~[?:1.8.0_ 251]

At java.lang.Class .forName0(Native Method) ~[?:1.8.0_ 251]

At java.lang.Class .forName( Class.java:348 ) ~[?:1.8.0_ 251]

At net.minecraft.launchwrapper . Launch.launch ( Launch.java:98 ) [launchwrapper-1.12.jar:?]

At net.minecraft.launchwrapper . Launch.main ( Launch.java:28 ) [launchwrapper-1.12.jar:?]

At sun.reflect.NativeMethodAccessorImpl .invoke0(Native Method) ~[?:1.8.0_ 251]

At sun.reflect.NativeMethodAccessorImpl .invoke(Nati veMethodAccessorImpl.java:62 ) ~[?:1.8.0_ 251]

At sun.reflect.DelegatingMethodAccessorImpl .invoke(Delegati ngMethodAccessorImpl.java:43 ) ~[?:1.8.0_ 251]

At java.lang.reflect . Method.invoke ( Method.java:498 ) ~[?:1.8.0_ 251]

At net.minecraftforge.gradle . GradleStartCommon.launch ( GradleStartCommon.java:97 ) [start/:?]

At GradleStart.main ( GradleStart.java:25 ) [start/:?]. lang.ClassNotFoundException : net.minecraftforge.fml . common.launcher.FMLTweaker

At java.net.URLClassLoader .findClass( URLClassLoader.java:382 ) ~[?:1.8.0_ 251]

At java.lang.ClassLoader .loadClass( ClassLoader.java:418 ) ~[?:1.8.0_ 251]

At sun.misc.Launcher $ AppClassLoader.loadClass ( Launcher.java:355 ) ~[?:1.8.0_ 251]

At java.lang.ClassLoader .loadClass( ClassLoader.java:351 ) ~[?:1.8.0_ 251]

Process finished with exit code 1

I had to modify one import statment

It was because ofEasingObjectwas not here, you can search for it or see how 1.8.9-Forge did it.
Edit: import net.ccbluex.liquidbounce.injection.utils.EasingObject; -> import net.ccbluex.liquidbounce.utils.render.EasingObject;.
Edit: of the file net/ccbluex/liquidbounce/injection/forge/mixins/fml/MixinSplashProgressAC2.java
No I still don't no why it crashes

gradlew build

Hello, I have completed gradlew build according to your tutorial, and there is no problem displayed on my IntelliJ idea. When I tried to run the source code of 1.12.2-forge, my IntelliJ idea made a mistake in the build source code. I collected the wrong information, please see:Log.txt
and
Log(2).txt
Can you help me to find out the reason and give the solutions? ：）

rootProject.name = 'LiquidBounce'

if (System.getenv()['mcversion'] == "1.12") {
    include '1.12.2-Forge'
} else {
    include '1.8.9-Forge'
}

// include '1.8.9-Vanilla'

Which means you only have to make the environment variable mcversion equals to 1.12 then you can do gradlew build.
On *nix u need to use mcversion="1.12" bash ./gradlew build, I already forgot how to temporarily set a environment variable on Windows.

The jar will be at 1.12.2-Forge/build/libs/LiquidBounce-B73.jar

However I have not found a way to change environment variable in Intellij idea, because simple modifying setting.gradle takes less energy(still bad tho).

Btw last time when I compiled cross_version stuff I had to modify one import statment to compile, never tested tho(it was at this commit). There seemed to be more frequent commits lately, it might be ready to use in a short period I guess. (Spoiler: there is a new branch for 1.16.2-fabric, however there is no commit yet)

Edit: I tested and crashed when I tired to launch lol.
Edit: Crashing in splash screen does not always happens. I managed to launch once

tutorial

It isn't open-source yet