(fixed) no refmap generated upon build | The Fabric Project | Page 1

misty rampart Sep 22, 2025, 9:10 PM

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When I build my mod and run it on the base version of Minecraft through modrinth, it completely freaks out and crashes. But running it through the IDE works flawlessly with no issues, and my mixins load and run perfectly fine.
I am unsure if this is the right place for this, but I feel like this issue is too specific. I am a beginner, and I am working on this with an also beginner friend, so we are both clueless.
I have been searching for hours on how to solve this, and nearly every solution I have tried has failed.
I am genuinely curious if I'm doing something totally wrong because its been nearly 2 days since I have been trying to solve this...
My error tells me that I need a refmap, but I do not see one generated when I build:
Caused by: org.spongepowered.asm.mixin.injection.throwables.InvalidInjectionException: Critical injection failure: @Inject annotation on update could not find any targets matching 'updateMouse' in net/minecraft/class_312. No refMap loaded. [INJECT_PREPARE Applicator Phase -> marmot.client.mixins.json:MouseMixin from mod marmot -> Prepare Injections -> handler$zpj000$marmot$update(DLorg/spongepowered/asm/mixin/injection/callback/CallbackInfo;)V -> Parse -> -> Validate Targets]

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@quasi reef

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does the fact that my mod is kotlin change anything? my mixins are written in java

quasi reef Sep 22, 2025, 9:21 PM

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misty rampart does the fact that my mod is kotlin change anything? my mixins are written in ja...

the fact its kotlin might be an issue, i cant find any mods that uses mixins written in kotlin

misty rampart Sep 22, 2025, 9:22 PM

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i have seen many, i just cant remember what they were

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i dont think i can bring myself to rewrite the entire mod in java

old grove Sep 23, 2025, 2:15 AM

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you're not supposed to write mixins in kotlin

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show your mixin.json

misty rampart Sep 23, 2025, 7:19 AM

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i rewrote the mixins in java last night

{
  "required": true,
  "minVersion": "0.8",
  "package": "me.znotchill.marmot.client.mixins",
  "compatibilityLevel": "JAVA_21",
  "injectors": {
    "defaultRequire": 1
  },
  "overwrites": {
    "requireAnnotations": true
  }
}

client mixins:

{
  "required": true,
  "minVersion": "0.8",
  "package": "me.znotchill.marmot.client.mixins",
  "compatibilityLevel": "JAVA_21",
  "client": [
    "GameRendererMixin",
    "MouseMixin",
    "HeldItemRendererMixin",
    "HeldItemRendererMixin"
  ],
  "injectors": {
    "defaultRequire": 1
  },
  "overwrites": {
    "requireAnnotations": true
  },
  "refmap": "marmot.refmap.json"
}

old grove Sep 23, 2025, 7:20 AM

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why did you add the "refmap"?

misty rampart Sep 23, 2025, 7:20 AM

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idk i've been searching in the discord for so long for a solution I just tried it

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doesn't seem to make a difference in the error i get

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should i remove it

old grove Sep 23, 2025, 7:20 AM

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yes

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then do a ./gradlew clean

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are you getting the error in dev or prod?

misty rampart Sep 23, 2025, 7:21 AM

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prod

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it works flawlessly in dev but as soon as I put it on an actual mc client it just crashes

old grove Sep 23, 2025, 7:21 AM

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right

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do a ./gradlew build and use the generated jar to test again

misty rampart Sep 23, 2025, 7:22 AM

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still crashed :p

old grove Sep 23, 2025, 7:22 AM

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can you show the mods folder in prod client?

misty rampart Sep 23, 2025, 7:23 AM

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they're the same version as the ones in my dev environment i'm pretty sure

org.gradle.jvmargs=-Xmx1G
# Fabric Properties
# check these on https://modmuss50.me/fabric.html
minecraft_version=1.21.8
yarn_mappings=1.21.8+build.1
loader_version=0.17.2
kotlin_loader_version=1.13.6+kotlin.2.2.20
# Mod Properties
mod_version=1.0-SNAPSHOT
maven_group=me.znotchill
archives_base_name=marmot
# Dependencies
# check this on https://modmuss50.me/fabric.html
fabric_version=0.133.4+1.21.8

old grove Sep 23, 2025, 7:25 AM

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where did you get the jar file from?

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build/libs?

misty rampart Sep 23, 2025, 7:26 AM

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yes

old grove Sep 23, 2025, 7:26 AM

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hmmmm

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now can you show the mixin that's crashing?

misty rampart Sep 23, 2025, 7:27 AM

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its all of them , but this one crashes first:

package me.znotchill.marmot.client.mixins;

import me.znotchill.marmot.client.Client;
import net.minecraft.client.MinecraftClient;
import net.minecraft.client.Mouse;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Inject;
import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;

@Mixin(Mouse.class)
public class MouseMixin {
    @Inject(method = "updateMouse(D)V", at = @At("HEAD"), cancellable = true)
    void update(double timeDelta, CallbackInfo ci) {
        if (Client.cameraLocked) {
            ci.cancel();
        }
    }

    @Inject(method = "onMouseButton(JIII)V", at = @At("HEAD"), cancellable = true)
    void onMouseButton(CallbackInfo ci) {
        MinecraftClient mc = MinecraftClient.getInstance();
        if (Client.mouseButtonsLocked && !Client.emitMouseEvents) {
            if (mc.currentScreen == null) {
                ci.cancel();
            }
        }
    }
}```

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it says theres no method, but no matter what method I try it doesn't remove the crash

old grove Sep 23, 2025, 7:33 AM

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is your project on github?

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that mixin looks correct

misty rampart Sep 23, 2025, 7:35 AM

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old grove is your project on github?

yes, repo is private though I can make it public

old grove Sep 23, 2025, 7:35 AM

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i can have look if you do

misty rampart Sep 23, 2025, 7:38 AM

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https://github.com/zNotChill/marmot

GitHub

GitHub - zNotChill/marmot: A Minecraft Fabric utility mod for infin...

A Minecraft Fabric utility mod for infinite customization - zNotChill/marmot

old grove Sep 23, 2025, 8:20 AM

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i get that error too

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i can only attribute this to your project structure which not quite common

misty rampart Sep 23, 2025, 11:38 AM

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what would you suggest my structure should be?

old grove Sep 23, 2025, 12:02 PM

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i'm quite not sure. everything in the mod project looks normal for me

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the only odd thing is i didn't see a refmap in the final mod jar

misty rampart Sep 23, 2025, 12:03 PM

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yeah it’s so confusing, every solution I try just doesn’t work 🥲

stark oasis Sep 23, 2025, 2:41 PM

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You might try messing with the mixin block in the loom extension configuration block in build.gradle

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Potentially try useLegacyMixinAP=false or something

misty rampart Sep 23, 2025, 3:41 PM

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no way... that fixed it

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thank you so much 😭 oh my

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genuinely thank you man 🙏

#(fixed) no refmap generated upon build