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c2b60d5 | 1 2 3 4 | {"task_id": "MIXIN_002", "module": "mixin", "instruction": "Write a Mixin that cancels ALL fire damage in LivingEntity#hurt. Target (Mojang mappings): net.minecraft.world.entity.LivingEntity#hurt(Lnet/minecraft/world/damagesource/DamageSource;F)Z. Cancel only when the DamageSource type is IN_FIRE.", "context": "", "golden_reference": "package com.example.examplemod.mixin;\n\nimport net.minecraft.world.damagesource.DamageSource;\nimport net.minecraft.world.damagesource.DamageTypes;\nimport net.minecraft.world.entity.LivingEntity;\nimport org.spongepowered.asm.mixin.Mixin;\nimport org.spongepowered.asm.mixin.injection.At;\nimport org.spongepowered.asm.mixin.injection.Inject;\nimport org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;\n\n@Mixin(LivingEntity.class)\npublic abstract class LivingEntityMixin {\n\n // Injecting into a boolean-returning method: CallbackInfoReturnable<Boolean>.\n // `cir.setReturnValue(true)` cancels the method and makes hurt() report \"handled\".\n @Inject(method = \"hurt(Lnet/minecraft/world/damagesource/DamageSource;F)Z\",\n at = @At(\"HEAD\"), cancellable = true)\n private void examplemod$cancelFireDamage(DamageSource source, float amount,\n CallbackInfoReturnable<Boolean> cir) {\n if (source.is(DamageTypes.IN_FIRE) || source.is(DamageTypes.ON_FIRE)) {\n cir.setReturnValue(false);\n }\n }\n}", "eval_criteria": {"must_compile": true, "required_annotations": ["@Inject"], "forbidden_apis": ["net.minecraftforge"], "gametest_required": false}}
{"task_id": "MIG_004", "module": "migration", "instruction": "Migrate this Forge 1.20.1 item that stores an `energy` value in item NBT to NeoForge 1.21.1 using a registered DataComponentType instead of CompoundTag.", "context": "// Forge 1.20.1\npublic class BatteryItem extends Item {\n public BatteryItem(Properties props) { super(props); }\n\n public int getEnergy(ItemStack stack) {\n return stack.getOrCreateTag().getInt(\"energy\");\n }\n\n public void setEnergy(ItemStack stack, int value) {\n stack.getOrCreateTag().putInt(\"energy\", Math.max(0, value));\n }\n\n public static void register(IEventBus bus) {\n // nothing special in 1.20.1\n }\n}", "golden_reference": "// NeoForge 1.21.1\npackage com.example.examplemod;\n\nimport com.mojang.serialization.Codec;\nimport net.minecraft.core.component.DataComponentType;\nimport net.minecraft.core.registries.Registries;\nimport net.minecraft.network.codec.ByteBufCodecs;\nimport net.minecraft.world.item.Item;\nimport net.minecraft.world.item.ItemStack;\nimport net.neoforged.bus.api.IEventBus;\nimport net.neoforged.neoforge.registries.DeferredHolder;\nimport net.neoforged.neoforge.registries.DeferredRegister;\n\npublic class BatteryItem extends Item {\n public BatteryItem(Properties props) { super(props); }\n\n public int getEnergy(ItemStack stack) {\n return stack.getOrDefault(ExampleMod.ENERGY.get(), 0);\n }\n\n public void setEnergy(ItemStack stack, int value) {\n stack.set(ExampleMod.ENERGY.get(), Math.max(0, value));\n }\n}\n\nclass ExampleMod {\n public static final String MODID = \"examplemod\";\n\n public static final DeferredRegister<DataComponentType<?>> DATA_COMPONENTS =\n DeferredRegister.create(Registries.DATA_COMPONENT_TYPE, MODID);\n\n public static final DeferredHolder<DataComponentType<?>, DataComponentType<Integer>> ENERGY =\n DATA_COMPONENTS.registerComponent(\"energy\",\n builder -> builder\n .persistent(Codec.INT)\n .networkSynchronized(ByteBufCodecs.VAR_INT)\n .build());\n\n public ExampleMod(IEventBus modBus) {\n DATA_COMPONENTS.register(modBus);\n }\n}", "eval_criteria": {"must_compile": true, "required_annotations": [], "forbidden_apis": ["net.minecraftforge", "MinecraftForge.EVENT_BUS", "net.minecraft.util.text", "LazyOptional", "getOrCreateTag", "NetworkRegistry", "SimpleChannel", "FMLJavaModLoadingContext", "ForgeConfigSpec", "DistExecutor", "DeferredWorkQueue", "ForgeSpawnEggItem", "setRegistryName", "TickEvent.PlayerTickEvent"], "gametest_required": false}}
{"task_id": "DEBUG_004", "module": "debug", "instruction": "Analyze the FML crash/log snippet below for a NeoForge 1.21.1 dedicated server. Return ONLY a JSON object with keys root_cause, fix_explanation, code_patch. Reference concrete FML/NeoForge terminology; do not give generic advice such as 'update your Java' unless the log shows a class-version error.", "context": "[main/ERROR] [ne.fml.lo.mo/]: Mod 'examplemod' caused an exception during modloading\nCaused by: java.lang.RuntimeException: Attempted to load class net/minecraft/client/Minecraft for invalid dist DEDICATED_SERVER\n\tat TRANSFORMER/examplemod@1.0.0/com.example.ClientProxy.<init>(ClientProxy.java:18)\n\tat TRANSFORMER/examplemod@1.0.0/com.example.CommonProxy.<init>(CommonProxy.java:9)\n\tat TRANSFORMER/examplemod@1.0.0/com.example.ExampleMod.<init>(ExampleMod.java:14)\nDist: DEDICATED_SERVER", "golden_reference": "{\n \"root_cause\": \"The common code path unconditionally constructs ClientProxy, whose constructor references net.minecraft.client.Minecraft - a client-only class. On a dedicated server (dist DEDICATED_SERVER) the class fails to load with 'invalid dist DEDICATED_SERVER'.\",\n \"fix_explanation\": \"Never touch client classes from common code. Remove the ClientProxy construction from the common path and either (a) isolate client logic in classes registered via @Mod.EventBusSubscriber(value = Dist.CLIENT) or a second @Mod entry point with dist = Dist.CLIENT, or (b) guard with FMLEnvironment.dist checks at the call boundary. Runtime-guarded lazy loading only helps if the client class is not referenced in the loaded code path at all.\",\n \"code_patch\": \"// common\\npublic ExampleMod(IEventBus modBus) {\\n // no client construction here\\n}\\n\\n// client-only\\n@Mod(value = ExampleMod.MODID, dist = Dist.CLIENT)\\npublic class ExampleModClient { ... }\"\n}", "eval_criteria": {"must_compile": false, "required_annotations": [], "forbidden_apis": [], "gametest_required": false}}
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