java - Minecraft 织物编码错误 : Exception while loading entries for entrypoint 'main' provided by 'myfirstmod'

Question

package net.my.first.mod;

import net.fabricmc.api.ModInitializer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemGroup;
import net.minecraft.util.Identifier;
import net.minecraft.util.registry.Registry;
import net.minecraft.block.Block;

public class MyFirstMod implements ModInitializer {

    public static final Item FABRIC_ITEM = new FabricItem(new Item.Settings().group(ItemGroup.MISC), null);

    public static final Block FABRIC_BLOCK = new FabricBlock();

    @Override
    public void onInitialize() {
        Registry.register(Registry.ITEM, new Identifier("myfirstmod", "fabric_item"), FABRIC_ITEM);
        Registry.register(Registry.BLOCK, new Identifier("myfirstmod", "fabric_block"), FABRIC_BLOCK);
    }

}

package net.my.first.mod;

import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.util.ActionResult;
import net.minecraft.util.Hand;
import net.minecraft.util.TypedActionResult;
import net.minecraft.world.World;

public class FabricItem extends Item {

    public FabricItem(Settings settings, Settings item$Settings_1) {
        super(item$Settings_1);

    }

    @Override
    public TypedActionResult<ItemStack> use(World world, PlayerEntity playerEntity, Hand hand) {
        return new TypedActionResult<ItemStack>(ActionResult.SUCCESS, playerEntity.getStackInHand(hand));
    }

}

每当我尝试运行我的代码时，我都会遇到崩溃。我正在使用 Visual Studio 代码，我不明白为什么会发生这种情况，我什至尝试重新编码整个事情。这是我收到的错误:

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 27/04/20 18:57
Description: Initializing game

net.fabricmc.loader.api.EntrypointException: Exception while loading entries for entrypoint 'main' provided by 'myfirstmod'
    at net.fabricmc.loader.EntrypointStorage.getEntrypointContainers(EntrypointStorage.java:193)
    at net.fabricmc.loader.FabricLoader.getEntrypointContainers(FabricLoader.java:228)
    at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke0(EntrypointUtils.java:44)
    at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke(EntrypointUtils.java:36)
    at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointClient.start(EntrypointClient.java:32)
    at net.minecraft.client.MinecraftClient.<init>(MinecraftClient.java:362)
    at net.minecraft.client.main.Main.main(Main.java:140)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:192)
    at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
    at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
    at net.fabricmc.devlaunchinjector.Main.main(Main.java:86)
Caused by: java.lang.ExceptionInInitializerError
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at net.fabricmc.loader.util.DefaultLanguageAdapter.create(DefaultLanguageAdapter.java:45)
    at net.fabricmc.loader.EntrypointStorage$NewEntry.create(EntrypointStorage.java:114)
    at net.fabricmc.loader.EntrypointStorage$NewEntry.getOrCreate(EntrypointStorage.java:101)
    at net.fabricmc.loader.EntrypointStorage.getEntrypointContainers(EntrypointStorage.java:186)
    ... 14 more
Caused by: java.lang.NullPointerException
    at net.minecraft.item.Item$Settings.method_7897(Item.java:369)
    at net.minecraft.item.Item.<init>(Item.java:92)
    at net.my.first.mod.FabricItem.<init>(FabricItem.java:14)
    at net.my.first.mod.MyFirstMod.<clinit>(MyFirstMod.java:12)
    ... 20 more


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Render thread
Stacktrace:
    at net.fabricmc.loader.EntrypointStorage.getEntrypointContainers(EntrypointStorage.java:193)
    at net.fabricmc.loader.FabricLoader.getEntrypointContainers(FabricLoader.java:228)
    at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke0(EntrypointUtils.java:44)
    at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke(EntrypointUtils.java:36)
    at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointClient.start(EntrypointClient.java:32)
    at net.minecraft.client.MinecraftClient.<init>(MinecraftClient.java:362)

-- Initialization --
Details:
Stacktrace:
    at net.minecraft.client.main.Main.main(Main.java:140)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:192)
    at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
    at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
    at net.fabricmc.devlaunchinjector.Main.main(Main.java:86)

-- System Details --
Details:
    Minecraft Version: 1.15.2
    Minecraft Version ID: 1.15.2
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_251, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 354621680 bytes (338 MB) / 570425344 bytes (544 MB) up to 1895825408 bytes (1808 MB)
    CPUs: 2
    JVM Flags: 3 total; -Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,address=localhost:65427,server=n,suspend=y
    Fabric Mods: 
        fabric: Fabric API 0.5.1+build.294-1.15
        fabric-api-base: Fabric API Base 0.1.2+b7f9825d0c
        fabric-biomes-v1: Fabric Biomes (v1) 0.1.5+3b05f68e0c
        fabric-blockrenderlayer-v1: Fabric BlockRenderLayer Registration (v1) 1.1.4+c6a8ea890c
        fabric-commands-v0: Fabric Commands (v0) 0.1.2+b7f9825d0c
        fabric-containers-v0: Fabric Containers (v0) 0.1.3+b7f9825d0c
        fabric-content-registries-v0: Fabric Content Registries (v0) 0.1.3+b7f9825d0c
        fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.1.2+b7f9825d0c
        fabric-dimensions-v1: fabric-dimensions-v1 0.3.0+2ad156310c
        fabric-events-interaction-v0: Fabric Events Interaction (v0) 0.3.0+fac69e320c
        fabric-events-lifecycle-v0: Fabric Events Lifecycle (v0) 0.1.2+b7f9825d0c
        fabric-item-groups-v0: Fabric Item Groups (v0) 0.1.6+ec40b2e10c
        fabric-keybindings-v0: Fabric Key Bindings (v0) 0.1.1+dfdb52d60c
        fabric-loot-tables-v1: Fabric Loot Tables (v1) 0.1.5+e08a73050c
        fabric-mining-levels-v0: Fabric Mining Levels (v0) 0.1.1+b7f9825d0c
        fabric-models-v0: Fabric Models (v0) 0.1.0+dfdb52d60c
        fabric-networking-blockentity-v0: Fabric Networking Block Entity (v0) 0.2.3+e08a73050c
        fabric-networking-v0: Fabric Networking (v0) 0.1.7+12515ed90c
        fabric-object-builders-v0: Fabric Object Builders (v0) 0.1.3+e4c9a9c30c
        fabric-particles-v1: fabric-particles-v1 0.1.1+dfdb52d60c
        fabric-registry-sync-v0: Fabric Registry Sync (v0) 0.2.6+f3d8141b0c
        fabric-renderer-api-v1: Fabric Renderer API (v1) 0.2.10+f08b61330c
        fabric-renderer-indigo: Fabric Renderer - Indigo 0.2.23+9290e2ed0c
        fabric-renderer-registries-v1: Fabric Renderer Registries (v1) 2.0.1+5a0f9a600c
        fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.1.3+b7f9825d0c
        fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 0.1.6+12515ed90c
        fabric-rendering-v0: Fabric Rendering (v0) 1.1.0+534104900c
        fabric-rendering-v1: Fabric Rendering (v1) 0.1.0+534104900c
        fabric-resource-loader-v0: Fabric Resource Loader (v0) 0.1.10+06c939b30c
        fabric-tag-extensions-v0: Fabric Tag Extensions (v0) 0.1.3+abd915800c
        fabric-textures-v0: Fabric Textures (v0) 1.0.4+821cdba70c
        fabricloader: Fabric Loader 0.8.2+build.194
        minecraft: Minecraft 1.15.2
        myfirstmod: My First Mod ${version}
    Launched Version: Fabric
    Backend library: LWJGL version 3.2.2 build 10
    Backend API: NO CONTEXT
    GL Caps: 
    Using VBOs: Yes
    Is Modded: Definitely; Client brand changed to 'fabric'
    Type: Client (map_client.txt)
    CPU: <unknown>

Answer 1

您正在丢弃真正的Settings，并传递null!更改此:

    public FabricItem(Settings settings, Settings item$Settings_1) {
        super(item$Settings_1);

    }

对此:

    public FabricItem(Settings settings, Settings item$Settings_1) {
        super(settings);

    }

您还可以从该定义以及在 MyFirstMod 中调用它的地方删除第二个参数，因为您现在没有将它用于任何用途。