can someone help me with this 1.21.8 fabric server side mod | The Fabric Project | Page 1

supple sparrow Sep 1, 2025, 9:45 PM

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help plz:

package com.camum.headrevival;

import net.minecraft.item.Item;
import net.minecraft.registry.Registries;
import net.minecraft.registry.Registry;
import net.minecraft.util.Identifier;

public class MyItems {
public static final Item RESURRECTION_ITEM = new Item(new Item.Settings().maxCount(1));

public static void register() {
    Registry.register(Registries.ITEM, new Identifier(HeadRevivalMod.MOD_ID, "resurrection_item"), RESURRECTION_ITEM);
}

}

lean sable Sep 1, 2025, 9:47 PM

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Looks like a mod 👍

supple sparrow Sep 1, 2025, 9:47 PM

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lean sable Looks like a mod 👍

you know why this is happening

lean sable Sep 1, 2025, 9:48 PM

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supple sparrow you know why this is happening

How did you get the mod template?

supple sparrow Sep 1, 2025, 9:48 PM

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https://fabricmc.net/develop/template/

Fabric

Template mod generator

The home of the Fabric mod development toolchain.

lean sable Sep 1, 2025, 9:49 PM

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Ok, try restarting IntelliJ / syncing gradle

supple sparrow Sep 1, 2025, 9:49 PM

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ive done that too many times

lean sable Sep 1, 2025, 9:49 PM

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Including syncing gradle?

supple sparrow Sep 1, 2025, 9:49 PM

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yea

lean sable Sep 1, 2025, 9:49 PM

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Then try clearing Gradle cache I guess.

supple sparrow Sep 1, 2025, 9:49 PM

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matter of fact im doing it right now

supple sparrow Sep 1, 2025, 9:50 PM

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lean sable Then try clearing Gradle cache I guess.

what the directory stuff to clear it

lean sable Sep 1, 2025, 9:50 PM

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C:\Users\<USERNAME>\.gradle\caches

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Probably will need to stop IntelliJ first

supple sparrow Sep 1, 2025, 9:51 PM

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yea i figured

lean sable Sep 1, 2025, 9:51 PM

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Possibly even restart computer cuz windows something holds on to the locks sometimes.

supple sparrow Sep 1, 2025, 9:51 PM

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yea um u want me to delete the cache folder??

lean sable Sep 1, 2025, 9:52 PM

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Yeah

supple sparrow Sep 1, 2025, 9:54 PM

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@lean sable does the code look correct?

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for 1.21.8

lean sable Sep 1, 2025, 9:54 PM

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No, but the imports look fine.

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new Identifier doesn't work anymore, you need Identifier.of

supple sparrow Sep 1, 2025, 10:00 PM

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@lean sable i did every thing u asked but it didnt work

lean sable Sep 1, 2025, 10:01 PM

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Is syncing gradle erroring?

supple sparrow Sep 1, 2025, 10:02 PM

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nah its the building part

lean sable Sep 1, 2025, 10:07 PM

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supple sparrow nah its the building part

Hmm. Can I have those logs?

supple sparrow Sep 1, 2025, 10:11 PM

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k

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Starting a Gradle Daemon, 3 stopped Daemons could not be reused, use --status for details

Configure project :
Fabric Loom: 1.11.7

Task :compileJava FAILED
C:\Users\user\Desktop\headrevival-template-1.21.8\src\main\java\com\user\headrevival\MyItems.java:3: error: package net.minecraft.item does not exist
import net.minecraft.item.Item;
^
C:\Users\user\Desktop\headrevival-template-1.21.8\src\main\java\com\user\headrevival\MyItems.java:4: error: package net.minecraft.registry does not exist
import net.minecraft.registry.Registries;
^

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C:\Users\user\Desktop\headrevival-template-1.21.8\src\main\java\com\user\headrevival\MyItems.java:5: error: package net.minecraft.registry does not exist
import net.minecraft.registry.Registry;
^
C:\Users\user\Desktop\headrevival-template-1.21.8\src\main\java\com\user\headrevival\MyItems.java:6: error: cannot find symbol
import net.minecraft.util.Identifier;
^
symbol: class Identifier
location: package net.minecraft.util
C:\Users\user\Desktop\headrevival-template-1.21.8\src\main\java\com\user\headrevival\MyItems.java:9: error: cannot find symbol
public static final Item RESURRECTION_ITEM = new Item(new Item.Settings().maxCount(1));
^
symbol: class Item
location: class MyItems
5 errors

[Incubating] Problems report is available at: file:///C:/Users/user/Desktop/headrevival-template-1.21.8/build/reports/problems/problems-report.html

FAILURE: Build failed with an exception.

What went wrong:
Execution failed for task ':compileJava'.

Compilation failed; see the compiler output below.
C:\Users\user\Desktop\headrevival-template-1.21.8\src\main\java\com\user\headrevival\MyItems.java:6: error: cannot find symbol
import net.minecraft.util.Identifier;
^
symbol: class Identifier
location: package net.minecraft.util
C:\Users\user\Desktop\headrevival-template-1.21.8\src\main\java\com\user\headrevival\MyItems.java:9: error: cannot find symbol
public static final Item RESURRECTION_ITEM = new Item(new Item.Settings().maxCount(1));
^

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symbol: class Item
location: class MyItems
C:\Users\user\Desktop\headrevival-template-1.21.8\src\main\java\com\user\headrevival\MyItems.java:3: error: package net.minecraft.item does not exist
import net.minecraft.item.Item;
^
C:\Users\user\Desktop\headrevival-template-1.21.8\src\main\java\com\user\headrevival\MyItems.java:4: error: package net.minecraft.registry does not exist
import net.minecraft.registry.Registries;
^
C:\Users\user\Desktop\headrevival-template-1.21.8\src\main\java\com\user\headrevival\MyItems.java:5: error: package net.minecraft.registry does not exist
import net.minecraft.registry.Registry;

lean sable Sep 1, 2025, 10:16 PM

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Are you using MojMaps? If you don't know, Ctrl+f build.gradle for Official.

supple sparrow Sep 1, 2025, 10:18 PM

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im not sure

lean sable Sep 1, 2025, 10:19 PM

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Does your build.gradle include yarn or Official?

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If you can't find either, send it

supple sparrow Sep 1, 2025, 10:20 PM

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plugins {
id 'fabric-loom' version "${loom_version}"
id 'maven-publish'
id "org.jetbrains.kotlin.jvm" version "2.2.10"
}

version = project.mod_version
group = project.maven_group

base {
archivesName = project.archives_base_name
}

repositories {
// You usually don’t need extra repos — Loom handles Minecraft + Fabric automatically
}

loom {
splitEnvironmentSourceSets()

mods {
    "headrevival" {
        sourceSet sourceSets.main
        sourceSet sourceSets.client
    }
}

}

fabricApi {
configureDataGeneration {
client = true
}
}

dependencies {
// Core
minecraft "com.mojang:minecraft:${project.minecraft_version}"
mappings loom.officialMojangMappings()
modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"

// Fabric API (needed for registry, events, etc.)
modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"

// Kotlin support
modImplementation "net.fabricmc:fabric-language-kotlin:${project.fabric_kotlin_version}"

}

processResources {
inputs.property "version", project.version

filesMatching("fabric.mod.json") {
    expand "version": inputs.properties.version
}

}

tasks.withType(JavaCompile).configureEach {
it.options.release = 21
}

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
kotlinOptions {
jvmTarget = "21"
}
}

java {
withSourcesJar()
sourceCompatibility = JavaVersion.VERSION_21
targetCompatibility = JavaVersion.VERSION_21
}

jar {
inputs.property "archivesName", project.base.archivesName

from("LICENSE") {
    rename { "${it}_${inputs.properties.archivesName}" }
}

}

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publishing {
publications {
create("mavenJava", MavenPublication) {
artifactId = project.archives_base_name
from components.java
}
}
repositories {
// Add publishing repos if needed
}
}

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thats what my .build looks like

lean sable Sep 1, 2025, 10:21 PM

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supple sparrow plugins { id 'fabric-loom' version "${loom_version}" id 'maven-publish' ...

Ah, you're using Mojang Mappings. Basically there's a few sets of names for methods and classes - you're using the one that's less common for Fabric. If you want to keep it that way, then you'll need to translate tutorials into those names, usually with a website like linkie.

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If you want to use yarn, you can change to use that

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!!tut mappings

vestal rootBOT Sep 1, 2025, 10:22 PM

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https://fabricmc.net/wiki/tutorial:mappings

supple sparrow Sep 1, 2025, 10:23 PM

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lean sable If you want to use yarn, you can change to use that

will yarn help with the errors?

lean sable Sep 1, 2025, 10:24 PM

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You're using names from Yarn in a project that expects names from MojMap. To fix the errors, you can either change the project to expect yarn, or change the names to MojMap

supple sparrow Sep 1, 2025, 10:24 PM

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so just switch the dependences?

supple sparrow Sep 1, 2025, 10:24 PM

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lean sable You're using names from Yarn in a project that expects names from MojMap. To fix...

^

lean sable Sep 1, 2025, 10:25 PM

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If you want to use yarn, yes

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I'd generate a new template and copy the build.gradle and gradle.properties

supple sparrow Sep 1, 2025, 10:26 PM

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why?

lean sable Sep 1, 2025, 10:26 PM

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Cuz that will fix it for sure. You could do it by hand by copying from other projects I guess. It's like two lines to change but I don't know what to change those lines to.

lean sable Sep 1, 2025, 10:27 PM

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lean sable I'd generate a new template and copy the build.gradle and gradle.properties

Don't check "use official mappings"

supple sparrow Sep 1, 2025, 10:28 PM

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okay so just make a new template and then copy the scripts, build and properties

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@lean sable

lean sable Sep 1, 2025, 10:31 PM

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Yep

supple sparrow Sep 1, 2025, 10:37 PM

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@lean sable

lean sable Sep 1, 2025, 10:38 PM

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lean sable `new Identifier` doesn't work anymore, you need `Identifier.of`

^

supple sparrow Sep 1, 2025, 10:39 PM

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tried that

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@lean sable

lean sable Sep 1, 2025, 10:46 PM

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Please double check the same area. That is currently invalid Java.

supple sparrow Sep 1, 2025, 10:47 PM

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oops

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this look right @lean sable

lean sable Sep 1, 2025, 10:51 PM

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supple sparrow this look right <@564647964488892416>

Yep! Make sure to load it in your mod initializer. The easiest way to do that is to add

public static void init() {}

To your items class and call it in your main mod class.

supple sparrow Sep 1, 2025, 11:48 PM

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lean sable Yep! Make sure to load it in your mod initializer. The easiest way to do that is...

thank you

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🙏

supple sparrow Sep 2, 2025, 12:19 AM

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@lean sable

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can u help me rq

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lean sable Sep 2, 2025, 12:20 AM

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!!splitsources , you can't access client classes in the main source set (folder)

vestal rootBOT Sep 2, 2025, 12:20 AM

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Split Sources

Split Sources provide a compile-time guarantee against calling client only Minecraft code or client only API on the server.

Client-only code can be placed in client, and code that is common to client and server can be placed in main. Client-only code can refer code in main, but not the other way.

supple sparrow Sep 2, 2025, 12:20 AM

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i already have split sources

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@lean sable

lean sable Sep 2, 2025, 12:21 AM

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Yes, I know. That's the reason you can't access client classes from the main folder.

supple sparrow Sep 2, 2025, 12:21 AM

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so get rid of it

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?

lean sable Sep 2, 2025, 12:21 AM

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No, move your client to the client folder

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Split sources is the reason it's not compiling. If you removed split sources, you'd suddenly start crashing, but only on dedicated servers.

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Annoying to deal with if you do that

supple sparrow Sep 2, 2025, 12:25 AM

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@lean sable i moved the thing to the client folder but what about the rest of the errors

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lean sable Sep 2, 2025, 12:26 AM

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supple sparrow Sep 2, 2025, 12:30 AM

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@lean sable this is a server side mod tho

lean sable Sep 2, 2025, 12:31 AM

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Then you can't mixin MinecraftClient. It's not a thing on the server.

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You also can't add items without polymer

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!!Mr polymer

vestal rootBOT Sep 2, 2025, 12:32 AM

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https://modrinth.com/mod/polymer

Modrinth

Polymer - Minecraft Mod

Library for creating better server side content!

supple sparrow Sep 2, 2025, 12:32 AM

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its not really an item though

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i need a crafting recipe for things that are already in the game

lean sable Sep 2, 2025, 12:33 AM

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supple sparrow <@564647964488892416>

This is an item

lean sable Sep 2, 2025, 12:33 AM

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supple sparrow i need a crafting recipe for things that are already in the game

You can do that with pure datapacks, no mod needed.

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https://misode.github.io/recipe/

supple sparrow Sep 2, 2025, 12:34 AM

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well the whole premise was for players when they get killed 2 times on the 3rd death there head drops (i alr have a mod for that) and then u use a crafting recipe (including diamonds, totem and player head) and then it gives you a enchanted player head which when placed on the ground unbanneds them

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@lean sable

lean sable Sep 2, 2025, 12:35 AM

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You can manage that with custom components maybe, but polymer might make it easier

supple sparrow Sep 2, 2025, 12:36 AM

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so ur saying i can just do this whole thing with polymer

lean sable Sep 2, 2025, 12:36 AM

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It'll help making the item and giving it data

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But you don't need it nessecarily

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If you touch a Registry that's not dynamic (read: datapack), you have to use polymer, remake polymer yourself, or make it client-side too

supple sparrow Sep 2, 2025, 2:05 AM

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can u help me rq

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heres my script thing and the error that my friends getting for this mod is: java.lang.NullPointerException: Item id not set at java.base/

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@lean sable

lean sable Sep 2, 2025, 2:13 AM

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supple sparrow heres my script thing and the error that my friends getting for this mod is: jav...

Are they trying to join without the mod installed on their client?

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!!llm

vestal rootBOT Sep 2, 2025, 2:13 AM

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Whilst LLMs (Large Language Models) like ChatGPT and Gemini are impressive tools, **they are not recommended for first-time Fabric mod developers due to their inconsistency and potential for generating inaccurate code. **

LLMs may generate incorrect code that:

Targets the wrong Minecraft version, leading to outdated or incompatible features.
Uses incorrect mappings, causing errors or unexpected behavior.
Is designed for the wrong loader (NeoForge vs. Fabric), resulting in incompatibility.
Relies on non-existent Fabric API modules, creating code that references features that don't exist (called LLM hallucinations)

It's crucial to remember that LLMs should be seen as problem-solving aids, not code-generating machines. The output they provide often requires significant modification and understanding of Java before it can be implemented as a functional mod.

Therefore, learning Java is an absolute necessity before attempting to use any LLM-generated code in your mod. Knowing how the generated code works is key to using it effectively and fixing any problems that may arise.

supple sparrow Sep 2, 2025, 2:17 AM

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no he is running it on his server

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@lean sable

lean sable Sep 2, 2025, 2:20 AM

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Does it work for you?

supple sparrow Sep 2, 2025, 2:22 AM

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i can try

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[19:23:42] [main/ERROR]: Failed to start the minecraft server
java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors, provided by 'headrevival' at 'camum.headrevival.HeadRevivalMod'!
at net.fabricmc.loader.impl.FabricLoaderImpl.lambda$invokeEntrypoints$2(FabricLoaderImpl.java:409) ~[fabric-loader-0.17.2.jar:?]
at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33) ~[fabric-loader-0.17.2.jar:?]
at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:407) ~[fabric-loader-0.17.2.jar:?]
at net.fabricmc.loader.impl.game.minecraft.Hooks.startServer(Hooks.java:63) ~[fabric-loader-0.17.2.jar:?]
at knot/net.minecraft.server.Main.main(Main.java:114) [server-intermediary.jar:?]
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:506) [fabric-loader-0.17.2.jar:?]
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:72) [fabric-loader-0.17.2.jar:?]
at net.fabricmc.loader.impl.launch.knot.KnotServer.main(KnotServer.java:23) [fabric-loader-0.17.2.jar:?]
at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:69) [fabric-loader-0.17.2.jar:?]

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Caused by: java.lang.NullPointerException: Item id not set
at java.base/java.util.Objects.requireNonNull(Objects.java:259) ~[?:?]
at knot/net.minecraft.class_1792$class_1793.method_63689(class_1792.java:340) ~[server-intermediary.jar:?]
at knot/net.minecraft.class_1792.<init>(class_1792.java:134) ~[server-intermediary.jar:?]
at knot/camum.headrevival.MyItems.registerModItems(MyItems.java:20) ~[headrevival-1.21.8.jar:?]
at knot/camum.headrevival.HeadRevivalMod.onInitialize(HeadRevivalMod.java:12) ~[headrevival-1.21.8.jar:?]
at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:405) ~[fabric-loader-0.17.2.jar:?]
... 6 more

C:\Users\camum\Desktop\Minecraft>pause
Press any key to continue . . .

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that is the error im getting

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@lean sable

lean sable Sep 2, 2025, 2:25 AM

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supple sparrow heres my script thing and the error that my friends getting for this mod is: jav...

You registered this

supple sparrow Sep 2, 2025, 2:25 AM

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?

lean sable Sep 2, 2025, 2:25 AM

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supple sparrow this look right <@564647964488892416>

Then tried to use this

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Pick one and stick with it

supple sparrow Sep 2, 2025, 2:26 AM

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gng im looking for anything to make the mod work atp

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🙏

#can someone help me with this 1.21.8 fabric server side mod