So I'm trying to make a mod that adds enchantments to shields. I haven't added any effects to them yet, but I wanted to test if I could get them to show up in a shield when putting it inside an enchanting table, but they don't. I created a new EnumEnchantmentType called SHIELDS but it doesn't seem to work, I can't get the enchantments ingame. I know this is the case because I created a Test enchantment that, instead of being Shield enchantment type, is "Breakable" enchantment type (which is a vanilla enchantment type) and it's the only one that works. 

 

The error:

 

[13:32:03] [Server thread/WARN] [minecraft/CommandHandler]: Couldn't process command: enchant @p shieldenchants:shieldboost
java.lang.NullPointerException: null
    at net.minecraft.item.Item.canApplyAtEnchantingTable(Item.java:1167) ~[Item.class:?]
    at net.minecraft.enchantment.Enchantment.canApplyAtEnchantingTable(Enchantment.java:226) ~[Enchantment.class:?]
    at net.minecraft.enchantment.Enchantment.canApply(Enchantment.java:190) ~[Enchantment.class:?]
    at net.minecraft.command.CommandEnchant.execute(CommandEnchant.java:76) ~[CommandEnchant.class:?]
    at net.minecraft.command.CommandHandler.tryExecute(CommandHandler.java:126) [CommandHandler.class:?]
    at net.minecraft.command.CommandHandler.executeCommand(CommandHandler.java:98) [CommandHandler.class:?]
    at net.minecraft.network.NetHandlerPlayServer.handleSlashCommand(NetHandlerPlayServer.java:1003) [NetHandlerPlayServer.class:?]
    at net.minecraft.network.NetHandlerPlayServer.processChatMessage(NetHandlerPlayServer.java:979) [NetHandlerPlayServer.class:?]
    at net.minecraft.network.play.client.CPacketChatMessage.processPacket(CPacketChatMessage.java:47) [CPacketChatMessage.class:?]
    at net.minecraft.network.play.client.CPacketChatMessage.processPacket(CPacketChatMessage.java:8) [CPacketChatMessage.class:?]
    at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:21) [PacketThreadUtil$1.class:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_191]
    at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_191]
    at net.minecraft.util.Util.runTask(Util.java:53) [Util.class:?]
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:798) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:743) [MinecraftServer.class:?]
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192) [IntegratedServer.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:592) [MinecraftServer.class:?]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_191]
[13:32:03] [main/INFO] [minecraft/GuiNewChat]: [CHAT] An unknown error occurred while attempting to perform this command

 

This is the code:

 

The ModEnchantments class:

 

package jiro.shieldenchantments.init;

import jiro.shieldenchantments.enchantment.EnchantmentAbsorb;
import jiro.shieldenchantments.enchantment.EnchantmentBerserk;
import jiro.shieldenchantments.enchantment.EnchantmentDeflection;
import jiro.shieldenchantments.enchantment.EnchantmentGuard;
import jiro.shieldenchantments.enchantment.EnchantmentHeavyweight;
import jiro.shieldenchantments.enchantment.EnchantmentShieldBoost;
import jiro.shieldenchantments.enchantment.EnchantmentSlimy;
import jiro.shieldenchantments.enchantment.EnchantmentTest;
import net.minecraft.enchantment.Enchantment;
import net.minecraft.enchantment.EnumEnchantmentType;
import net.minecraft.item.ItemShield;
import net.minecraftforge.common.util.EnumHelper;
import net.minecraftforge.event.RegistryEvent.Register;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
import jiro.shieldenchantments.util.Reference;

@Mod.EventBusSubscriber(modid = Reference.MOD_ID)
public class ModEnchantments {
	
	public static final Enchantment HEAVYWEIGHT = new EnchantmentHeavyweight();
	public static final Enchantment BERSERK = new EnchantmentBerserk();
	public static final Enchantment GUARD = new EnchantmentGuard();
	public static final Enchantment DEFLECTION = new EnchantmentDeflection();
	public static final Enchantment ABSORB = new EnchantmentAbsorb();
	public static final Enchantment SHIELD_BOOST = new EnchantmentShieldBoost();
	public static final Enchantment SLIMY = new EnchantmentSlimy();
	public static final Enchantment TEST = new EnchantmentTest();
	
	public static final EnumEnchantmentType SHIELDS = EnumHelper.addEnchantmentType("shields", (item)->(item instanceof ItemShield));

	@SubscribeEvent
	public static void registerEnchantments(Register<Enchantment> event) {
		event.getRegistry().registerAll(HEAVYWEIGHT, BERSERK, GUARD, DEFLECTION, ABSORB, SHIELD_BOOST, SLIMY, TEST);
	}
	
}

 

One of the new enchantments class (they are all the same):

 

package jiro.shieldenchantments.enchantment;

import jiro.shieldenchantments.init.ModEnchantments;
import net.minecraft.enchantment.Enchantment;
import net.minecraft.enchantment.Enchantment.Rarity;
import net.minecraft.inventory.EntityEquipmentSlot;

public class EnchantmentSlimy extends Enchantment {
	
	public EnchantmentSlimy(){
		super(Rarity.COMMON, ModEnchantments.SHIELDS, new EntityEquipmentSlot[] {EntityEquipmentSlot.MAINHAND, EntityEquipmentSlot.OFFHAND});
		this.setRegistryName("slimy");
		this.setName("slimy");
	}
	
	@Override
	public int getMaxLevel() {
		return 4;
	}

}

 

The Main class:

 

package jiro.shieldenchantments;

import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.Mod.EventHandler;
import net.minecraftforge.fml.common.Mod.Instance;
import net.minecraftforge.fml.common.SidedProxy;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPostInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
import jiro.shieldenchantments.proxy.CommonProxy;
import jiro.shieldenchantments.util.Reference;

@Mod(modid = Reference.MOD_ID, name = Reference.NAME, version = Reference.VERSION)
public class Main {

	@Instance
	public static Main instance;
	
	@SidedProxy(clientSide = Reference.CLIENT_PROXY_CLASS, serverSide = Reference.COMMON_PROXY_CLASS)
	public static CommonProxy proxy;
	
	@EventHandler
	public static void PreInit(FMLPreInitializationEvent event){
		
	}
	
	@EventHandler
	public static void init(FMLInitializationEvent event){
		
	}
	
	@EventHandler
	public static void PostInit(FMLPostInitializationEvent event){
		
	}
}

 

What am I doing wrong? 

Edited December 25, 20186 yr by Jiro7
Problem solved!

Managed to fix this by simply putting

 

public static final EnumEnchantmentType SHIELDS = EnumHelper.addEnchantmentType("shields", (item)->(item instanceof ItemShield));

 

before

 

public static final Enchantment HEAVYWEIGHT = new EnchantmentHeavyweight();
	public static final Enchantment BERSERK = new EnchantmentBerserk();
	public static final Enchantment GUARD = new EnchantmentGuard();
	public static final Enchantment DEFLECTION = new EnchantmentDeflection();
	public static final Enchantment ABSORB = new EnchantmentAbsorb();
	public static final Enchantment SHIELD_BOOST = new EnchantmentShieldBoost();
	public static final Enchantment SLIMY = new EnchantmentSlimy();
	public static final Enchantment TEST = new EnchantmentTest();

 

Hope it helps others in the same situation!

You should prefix your enum with your modid