Search the Forums BEFORE making a new post.

[1.17.1] Forge Capability - How to save?

Posted December 2, 20213 yr

Hey guys I have created a mod that assigns levels to mobs and scales them up using capabilities, everything works great but because of the recent changes to capabilities I am unable to find examples on how to save the level of my mobs so that it remains the same if I restart the server. I will upload all my files relating to the capability and hope you guys can lead me in the right direction

package com.chickenwand3.rpgmod.core.capabilities.entity;

import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.CapabilityInject;
import net.minecraftforge.common.capabilities.CapabilityManager;

@SuppressWarnings("removal")
public class CapabilityMobLevel {

    @CapabilityInject(MobLevel.class)
    public static Capability<MobLevel> MOB_LEVEL_CAPABILITY = null;

    public static void register() {
        CapabilityManager.INSTANCE.register(MobLevel.class);
    }
}

package com.chickenwand3.rpgmod.core.capabilities.entity;

public class DefaultMobLevel implements MobLevel {

    public int mobLevel;
    public float mobMaxHealth;
    public float mobCurrentHealth;
    public boolean crazy;
    
    public boolean isCrazy() {
    	return crazy;
    }
    
    public float getMaxHealth() {
    	return mobMaxHealth;
    }
    
    public float getCurrentHealth() {
    	return mobCurrentHealth;
    }
}

package com.chickenwand3.rpgmod.core.capabilities.entity;

public interface MobLevel {
}

package com.chickenwand3.rpgmod.core.capabilities.entity;

import com.chickenwand3.rpgmod.RPGMod;

import net.minecraft.resources.ResourceLocation;

import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.Mob;
import net.minecraft.world.entity.ai.attributes.Attributes;
import net.minecraft.world.entity.monster.Zombie;
import net.minecraft.world.item.enchantment.Enchantments;
import net.minecraftforge.event.AttachCapabilitiesEvent;
import net.minecraftforge.event.entity.EntityJoinWorldEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;

@Mod.EventBusSubscriber(modid = RPGMod.MODID, bus = Mod.EventBusSubscriber.Bus.FORGE)
public class MobLevelEventHandler {
	@SubscribeEvent
	public static void onAttachCapabilitiesEvent(AttachCapabilitiesEvent<Entity> event) {
		if (event.getObject() instanceof Mob && !event.getObject().getCommandSenderWorld().isClientSide) {
			MobLevelProvider providerMobLevel = new MobLevelProvider();
			event.addCapability(new ResourceLocation(RPGMod.MODID, "moblevel"), providerMobLevel);
			event.addListener(providerMobLevel::invalidate);
		}
	}

	@SubscribeEvent
	public static void OnSpawn(final EntityJoinWorldEvent event) {
		if (event.getEntity()instanceof Mob target && !event.getWorld().isClientSide) {
			target.getCapability(CapabilityMobLevel.MOB_LEVEL_CAPABILITY).ifPresent(mobLevel -> {
				DefaultMobLevel actualMobLevel = (DefaultMobLevel) mobLevel;
				actualMobLevel.mobLevel = (randomizeMobLevel());

				if (superCrazy(actualMobLevel.mobLevel)) {
					actualMobLevel.crazy = true;
				}

				if (actualMobLevel.crazy) {

					if (!target.getMainHandItem().isEmpty()) {
						target.getMainHandItem().enchant(Enchantments.FIRE_ASPECT, 1);
					}
					if (event.getEntity()instanceof Zombie zombie) {
						zombie.getAttribute(Attributes.SPAWN_REINFORCEMENTS_CHANCE).setBaseValue(0.99D);
					}
					System.out.println("Super Crazy " + target.getName() + " has spawned!");
				}

				actualMobLevel.mobMaxHealth = (target.getMaxHealth() * actualMobLevel.mobLevel * 2);
				actualMobLevel.mobCurrentHealth = actualMobLevel.mobMaxHealth;
				target.getAttribute(Attributes.MOVEMENT_SPEED)
						.setBaseValue(target.getAttributeValue(Attributes.MOVEMENT_SPEED)
								* (1 + (actualMobLevel.mobLevel - 1.0) / 10.0));

				if (target.getAttribute(Attributes.ATTACK_DAMAGE) != null) {
					target.getAttribute(Attributes.ATTACK_DAMAGE)
							.setBaseValue(target.getAttributeValue(Attributes.ATTACK_DAMAGE)
									* (1 + (actualMobLevel.mobLevel - 1.0) / 2.0));
				}

			});
		}
	}

	private static int randomizeMobLevel() {
		boolean roll = true;
		int level = 1;
		while (roll) {
			if (Math.random() > .5) {
				level += 1;
				roll = true;
			} else {
				roll = false;
			}
		}
		return level;
	}

	private static boolean superCrazy(int level) {
		boolean result = false;
		if (level >= 5) {
			if (Math.random() < .25) {
				result = true;
			} else
				result = false;
		}
		return result;
	}

}

package com.chickenwand3.rpgmod.core.capabilities.entity;

import net.minecraft.core.Direction;
import net.minecraft.nbt.CompoundTag;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.ICapabilitySerializable;
import net.minecraftforge.common.util.LazyOptional;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class MobLevelProvider implements ICapabilitySerializable<CompoundTag> {
    private final DefaultMobLevel mobLevel = new DefaultMobLevel();
    private final LazyOptional<MobLevel> mobLevelOptional = LazyOptional.of(() -> mobLevel);

    public void invalidate() {
        mobLevelOptional.invalidate();
    }

    @Nonnull
    @Override
    public <T> LazyOptional<T> getCapability(@Nonnull Capability<T> cap, @Nullable Direction side) {
        return mobLevelOptional.cast();
    }

    @Override
    public CompoundTag serializeNBT() {
        if (CapabilityMobLevel.MOB_LEVEL_CAPABILITY == null) {
            return new CompoundTag();
        } else {
            CompoundTag compoundNBT = new CompoundTag();
            compoundNBT.putInt("mobLevel", mobLevel.mobLevel);
            compoundNBT.putFloat("mobCurrentHealth", mobLevel.mobCurrentHealth);
            compoundNBT.putFloat("mobMaxHealth", mobLevel.mobMaxHealth);
            compoundNBT.putBoolean("crazy", mobLevel.crazy);
            return compoundNBT;
        }
    }
    

    @Override
    public void deserializeNBT(CompoundTag nbt) {
        if (CapabilityMobLevel.MOB_LEVEL_CAPABILITY != null) {
            mobLevel.mobLevel = (nbt.getInt("mobLevel"));
            
            float mobCurrentHealth = nbt.getFloat("mobCurrentHealth");
            mobLevel.mobCurrentHealth = (mobCurrentHealth);
            
            float mobMaxHealth = nbt.getFloat("mobMaxHealth");
            mobLevel.mobMaxHealth = (mobMaxHealth);
            
            boolean crazy = nbt.getBoolean("crazy");
            mobLevel.crazy = (crazy);
        }
    }
}

Quote

December 2, 20213 yr

4 hours ago, chickenwand3 said:

I will upload all my files relating to the capability and hope you guys can lead me in the right direction

Is that a question?

If yes, your capability should be saved since your CapabilityProvider implements ICapabilitySerializable

Quote

December 2, 20213 yr

Author

Yeah its a question sorry for phrasing it weird, currently everytime I restart the server the mobs .mobLevel is being reset because it isn't saving. Im trying to decipher why this is happening and how to make it so that the .mobLevel for all the mobs in the server persists after a server restart

Quote

December 3, 20213 yr

are the serializeNBT and deserializeNBT method called, use Debbuger?

Quote

December 4, 20213 yr

Author

Good idea let me check

Quote

December 4, 20213 yr

Author

https://pastebin.com/LvSbvYhL

@Override
    public CompoundTag serializeNBT() {
    	System.out.println("It serialized");
        if (CapabilityMobLevel.MOB_LEVEL_CAPABILITY == null) {
        	System.out.println("It made a new compound");
            return new CompoundTag();
        } else {
        	System.out.println("It serialized the values");
            CompoundTag compoundNBT = new CompoundTag();
            compoundNBT.putInt("mobLevel", mobLevel.mobLevel);
            compoundNBT.putFloat("mobCurrentHealth", mobLevel.mobCurrentHealth);
            compoundNBT.putFloat("mobMaxHealth", mobLevel.mobMaxHealth);
            compoundNBT.putBoolean("crazy", mobLevel.crazy);
            return compoundNBT;
        }
    }
    

    @Override
    public void deserializeNBT(CompoundTag nbt) {
    	System.out.println("It deserialized");
        if (CapabilityMobLevel.MOB_LEVEL_CAPABILITY != null) {
        	System.out.println("It deserialized the values");
            mobLevel.mobLevel = (nbt.getInt("mobLevel"));
            
            float mobCurrentHealth = nbt.getFloat("mobCurrentHealth");
            mobLevel.mobCurrentHealth = (mobCurrentHealth);
            
            float mobMaxHealth = nbt.getFloat("mobMaxHealth");
            mobLevel.mobMaxHealth = (mobMaxHealth);
            
            boolean crazy = nbt.getBoolean("crazy");
            mobLevel.crazy = (crazy);
        }
    }

It seems like CapabilityMobLevel.MOB_LEVEL_CAPABILITY is always null and that is why it is acting like its a new entity and generating new values

Quote

December 4, 20213 yr

Author

Im looking and apparently @CapabilityInject is deprecated maybe that is why???

Quote

December 4, 20213 yr

you need to use RegisterCapabilitiesEvent to register your Capability

Quote

December 4, 20213 yr

Author

It worked thanks a lot ❤️ I'm gonna paste all of my code for anyone in the future looking to do capabilities

package com.chickenwand3.rpgmod.core.capabilities.entity;

import javax.annotation.Nullable;

import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.CapabilityManager;
import net.minecraftforge.common.capabilities.CapabilityToken;
import net.minecraftforge.common.capabilities.ICapabilityProvider;

public class CapabilityMobLevel{
	
    public static Capability<MobLevel> MOB_LEVEL_CAPABILITY = CapabilityManager.get(new CapabilityToken<>() {});
    
    public static void register() {
        CapabilityManager.INSTANCE.register(MobLevel.class);
    }
    

}

package com.chickenwand3.rpgmod.core.capabilities.entity;

public class DefaultMobLevel implements MobLevel {

    public int mobLevel;
    public float mobMaxHealth;
    public float mobCurrentHealth;
    public boolean crazy;
    
    public boolean isCrazy() {
    	return crazy;
    }
    
    public float getMaxHealth() {
    	return mobMaxHealth;
    }
    
    public float getCurrentHealth() {
    	return mobCurrentHealth;
    }
}

package com.chickenwand3.rpgmod.core.capabilities.entity;

public interface MobLevel {
}

package com.chickenwand3.rpgmod.core.capabilities.entity;

import com.chickenwand3.rpgmod.RPGMod;

import net.minecraft.resources.ResourceLocation;

import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.Mob;
import net.minecraft.world.entity.ai.attributes.Attributes;
import net.minecraft.world.entity.animal.Animal;
import net.minecraft.world.entity.monster.Zombie;
import net.minecraft.world.item.enchantment.Enchantments;
import net.minecraftforge.common.capabilities.RegisterCapabilitiesEvent;
import net.minecraftforge.event.AttachCapabilitiesEvent;
import net.minecraftforge.event.entity.EntityJoinWorldEvent;
import net.minecraftforge.event.entity.living.LivingDeathEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;

@Mod.EventBusSubscriber(modid = RPGMod.MODID, bus = Mod.EventBusSubscriber.Bus.FORGE)
public class MobLevelEventHandler {
	@SubscribeEvent
	public static void onAttachCapabilitiesEvent(AttachCapabilitiesEvent<Entity> event) {
		if (event.getObject() instanceof Mob && !event.getObject().getCommandSenderWorld().isClientSide) {
			MobLevelProvider providerMobLevel = new MobLevelProvider();
			event.addCapability(new ResourceLocation(RPGMod.MODID, "moblevel"), providerMobLevel);
			event.addListener(providerMobLevel::invalidate);
		}
	}
	
	@SubscribeEvent
	public void registerCaps(RegisterCapabilitiesEvent event) {
	    event.register(MobLevel.class);
	}
	
	
	

	@SubscribeEvent
	public static void OnSpawn(final EntityJoinWorldEvent event) {
		if (event.getEntity()instanceof Mob target && !event.getWorld().isClientSide) {
			target.getCapability(CapabilityMobLevel.MOB_LEVEL_CAPABILITY).ifPresent(mobLevel -> {
				DefaultMobLevel actualMobLevel = (DefaultMobLevel) mobLevel;
				
				if (actualMobLevel.mobLevel < 1) {
					actualMobLevel.mobLevel = (randomizeMobLevel());
				}

				if (superCrazy(actualMobLevel.mobLevel)) {
					actualMobLevel.crazy = true;
				}

				if (actualMobLevel.crazy) {

					if (!target.getMainHandItem().isEmpty()) {
						target.getMainHandItem().enchant(Enchantments.FIRE_ASPECT, 1);
					}
					if (event.getEntity()instanceof Zombie zombie) {
						zombie.getAttribute(Attributes.SPAWN_REINFORCEMENTS_CHANCE).setBaseValue(0.99D);
					}
					System.out.println("Super Crazy " + target.getName() + " has spawned!");
				}

				actualMobLevel.mobMaxHealth = (target.getMaxHealth() * actualMobLevel.mobLevel * 2);
				actualMobLevel.mobCurrentHealth = actualMobLevel.mobMaxHealth;
				target.getAttribute(Attributes.MOVEMENT_SPEED)
						.setBaseValue(target.getAttributeValue(Attributes.MOVEMENT_SPEED)
								* (1 + (actualMobLevel.mobLevel - 1.0) / 10.0));

				if (target.getAttribute(Attributes.ATTACK_DAMAGE) != null) {
					target.getAttribute(Attributes.ATTACK_DAMAGE)
							.setBaseValue(target.getAttributeValue(Attributes.ATTACK_DAMAGE)
									* (1 + (actualMobLevel.mobLevel - 1.0) / 2.0));
				}

			});
		}
	}

	private static int randomizeMobLevel() {
		boolean roll = true;
		int level = 1;
		while (roll) {
			if (Math.random() > .5) {
				level += 1;
				roll = true;
			} else {
				roll = false;
			}
		}
		return level;
	}

	private static boolean superCrazy(int level) {
		boolean result = false;
		if (level >= 5) {
			if (Math.random() < .25) {
				result = true;
			} else
				result = false;
		}
		return result;
	}

}

package com.chickenwand3.rpgmod.core.capabilities.entity;

import net.minecraft.core.Direction;
import net.minecraft.nbt.CompoundTag;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.ICapabilitySerializable;
import net.minecraftforge.common.util.LazyOptional;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class MobLevelProvider implements ICapabilitySerializable<CompoundTag> {
    private final DefaultMobLevel mobLevel = new DefaultMobLevel();
    private final LazyOptional<MobLevel> mobLevelOptional = LazyOptional.of(() -> mobLevel);

    public void invalidate() {
        mobLevelOptional.invalidate();
    }

    @Nonnull
    @Override
    public <T> LazyOptional<T> getCapability(@Nonnull Capability<T> cap, @Nullable Direction side) {
        return mobLevelOptional.cast();
    }

    @Override
    public CompoundTag serializeNBT() {
    	System.out.println("It serialized");
        if (CapabilityMobLevel.MOB_LEVEL_CAPABILITY == null) {
        	System.out.println("It made a new compound");
            return new CompoundTag();
        } else {
        	System.out.println("It serialized the values");
            CompoundTag compoundNBT = new CompoundTag();
            compoundNBT.putInt("mobLevel", mobLevel.mobLevel);
            compoundNBT.putFloat("mobCurrentHealth", mobLevel.mobCurrentHealth);
            compoundNBT.putFloat("mobMaxHealth", mobLevel.mobMaxHealth);
            compoundNBT.putBoolean("crazy", mobLevel.crazy);
            return compoundNBT;
        }
    }
    

    @Override
    public void deserializeNBT(CompoundTag nbt) {
    	System.out.println("It deserialized");
        if (CapabilityMobLevel.MOB_LEVEL_CAPABILITY != null) {
        	System.out.println("It deserialized the values");
            mobLevel.mobLevel = (nbt.getInt("mobLevel"));
            
            float mobCurrentHealth = nbt.getFloat("mobCurrentHealth");
            mobLevel.mobCurrentHealth = (mobCurrentHealth);
            
            float mobMaxHealth = nbt.getFloat("mobMaxHealth");
            mobLevel.mobMaxHealth = (mobMaxHealth);
            
            boolean crazy = nbt.getBoolean("crazy");
            mobLevel.crazy = (crazy);
        }
    }
}

Quote

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.

Reply to this topic...

https://forums.minecraftforge.net/topic/106325-1171-forge-capability-how-to-save/

Followers

Go to topic listing

IPS spam blocked by CleanTalk.

Announcements

[1.16.1]Render enchanted glint to item

ik this was 5 years ago but is this the same in 1.20? or is there a different method?

By FireDude123 · 22 hours ago22 hr
🎯 Elivius Needs You! Staff Wanted In All Positions! [Looking for Staff]

🌍 Elivius — Building a Legendary Minecraft Experience

Elivius is more than just a Minecraft server — it’s a vision. For years, our world has been in development, on and off, shaped by a small but passionate team. Now, we’re pushing forward with full force to create something unforgettable: a Towny-based survival experience enriched with custom quests, seasonal events, minigames, immersive builds, and unique features you won’t find anywhere else.

✨ Our Vision & Goals
Create a community-first server that feels alive, fair, and fun.
Build immersive seasonal events that keep players engaged year-round.
Develop custom content that brings personality and depth to Towny survival.
Grow Elivius into a credible, long-term project with transparency, quality, and heart.

We’ve already built the foundation, tested systems, and proven our resilience. Now, we’re looking for talented volunteers to join us and help Elivius become everything we know it can be.

⚒️ Recruiting Passionate Volunteers

Elivius is a volunteer project. While we don’t offer pay, we do provide:
🎁 Staff-exclusive giveaways (Nitro, rewards, in-game perks).
🏆 A chance to shape one of the most ambitious Towny servers.
💡 An opportunity to learn, grow, and leave your mark on something players will remember.
❤️ A welcoming, close-knit team that feels more like family.

We’re currently looking for:

🟦 Helper (Moderation Team)
Front-line moderators who answer questions, enforce rules, and keep the server safe and welcoming.

🟩 Builder
Creative builders who design spawns, event maps, and breathtaking seasonal builds.

🟨 Content Team
Configuration editors who bring features to life using plugins, resource packs, quests, menus, and systems.

🟦 Developer
Backend coders who create and maintain custom plugins, optimize performance, and bring new mechanics to life.

🟪 Media Team
Artists, editors, and designers who create graphics, trailers, animations, and promo content.

🟧 Content Creator
Streamers and YouTubers who help grow our player base. Creators get promotions and commissions on purchases through their codes.

🚀 Be Part of the Future of Elivius

We’re still small, but our ambitions are huge. With your help, we can turn Elivius into a legendary community where players feel at home and excited to return.

📌 All requirements are currently waived to help motivated applicants get started.
💬 Join our Discord and apply in the #staff-applications channel today!
👉 https://discord.gg/4HBU5tBDqc

Elivius wants YOU. Let’s build something unforgettable, together.

By AidenJules_ · Posted Yesterday at 03:58 AM1 day
[1.21.3] How to add effects to food?

game changed the way you create foods.
for example minecraft 1.21.8 code for the golden apple is

Foods.java
public static final FoodProperties GOLDEN_APPLE = new FoodProperties.Builder().nutrition(4).saturationModifier(1.2F).alwaysEdible().build();

Items.java
public static final Item GOLDEN_APPLE = registerItem("golden_apple", new Item.Properties().food(Foods.GOLDEN_APPLE, Consumables.GOLDEN_APPLE));

Consumables.java
public static final Consumable GOLDEN_APPLE = defaultFood() .onConsume( new ApplyStatusEffectsConsumeEffect( List.of(new MobEffectInstance(MobEffects.REGENERATION, 100, 1), new MobEffectInstance(MobEffects.ABSORPTION, 2400, 0)) ) )

By LordCambion · Saturday at 01:38 PM2 days
Is this forum active?

hello everyone..!

By WinX · Saturday at 06:47 AM2 days
How to add my mob to another mod's biome in 1.20.1.

tysm

By ilov3gam3z · Friday at 06:05 PM3 days

There are no registered users currently online

Sign In

[1.17.1] Forge Capability - How to save?

Featured Replies

Join the conversation

Posts

[1.16.1]Render enchanted glint to item

🎯 Elivius Needs You! Staff Wanted In All Positions! [Looking for Staff]

[1.21.3] How to add effects to food?

Is this forum active?

How to add my mob to another mod's biome in 1.20.1.

Who's Online (See full list)

Important Information

Account

Navigation

Search

Configure browser push notifications

Chrome (Android)

Chrome (Desktop)

Safari (iOS 16.4+)

Safari (macOS)

Edge (Android)

Edge (Desktop)

Firefox (Android)

Firefox (Desktop)