fix broken class loading

Author: FalsePattern

src/main/java/com/falsepattern/falsetweaks/asm/CoreLoadingPlugin.java

@@ -37,8 +37,7 @@
 import org.spongepowered.asm.launch.GlobalProperties;
 import org.spongepowered.asm.service.mojang.MixinServiceLaunchWrapper;
 
-import net.minecraft.launchwrapper.Launch;
-import net.minecraft.launchwrapper.LaunchClassLoader;
+import net.minecraft.launchwrapper.IClassTransformer;
 
 import java.util.List;
 import java.util.Map;
@@ -77,12 +76,14 @@ private static void pleaseDontBreakMyThreadedRendering() {
         } catch (Throwable ignored) {}
     }
 
+    static IClassTransformer FIELD_HACK_TF;
+
     @Override
     public String[] getASMTransformerClass() {
-
         val mixinTweakClasses = GlobalProperties.<List<String>>get(MixinServiceLaunchWrapper.BLACKBOARD_KEY_TWEAKCLASSES);
         if (mixinTweakClasses != null) {
-            mixinTweakClasses.add(Tags.ROOT_PKG + ".asm.MixinCompatHackTweaker");
+            FIELD_HACK_TF = new FalseTweaksFieldHackTransformer();
+            mixinTweakClasses.add(MixinCompatHackTweaker.class.getName());
         }
         return new String[]{Tags.ROOT_PKG + ".asm.FalseTweaksTransformer"};
     }

src/main/java/com/falsepattern/falsetweaks/asm/MixinCompatHackTweaker.java

@@ -23,8 +23,10 @@
 
 package com.falsepattern.falsetweaks.asm;
 
-import com.falsepattern.falsetweaks.Tags;
+import lombok.SneakyThrows;
+import lombok.val;
 
+import net.minecraft.launchwrapper.IClassTransformer;
 import net.minecraft.launchwrapper.ITweaker;
 import net.minecraft.launchwrapper.Launch;
 import net.minecraft.launchwrapper.LaunchClassLoader;
@@ -49,8 +51,12 @@ public String getLaunchTarget() {
     }
 
     @Override
+    @SneakyThrows
     public String[] getLaunchArguments() {
-        Launch.classLoader.registerTransformer(Tags.ROOT_PKG + ".asm.FalseTweaksFieldHackTransformer");
+        val f = LaunchClassLoader.class.getDeclaredField("transformers");
+        f.setAccessible(true);
+        val transformers = (List<IClassTransformer>) f.get(Launch.classLoader);
+        transformers.add(CoreLoadingPlugin.FIELD_HACK_TF);
         return new String[0];
     }
 }