[1.14] Capabilities for stamina?

[nenikitov]

Hello!

I'm currently working on adding stamina system in minecraft and i face a problem where i need to add "stamina" variable to each client.

Firstly, I would like to know did I get it right that capabilities is the correct way of doing it.

Secondly, i have watched already numerous tutorials and have red documentation about capabilities, but I still can't get how to make it work, I don't understand how to make your own capability and attach it to the PlayerEntity.

Thanks in advance.

[nenikitov]

1. What are forge provided capabilities for? I get what is IItemHandler, but the other 2, like what is fluid inventory and energy container?

2. What is EnumFacing?

3. Documentation shows the creation of custom capabilities with 3 separate classes, capability, storage and factory. Then they show what is written in storage and factory class. So they leave cabability class empty or what should be written there?

4. After i ve written a custom capability, where should i inject it? In which class?

5. I didnt get in which class i should register my capability?

---------

6. Maybe there is an example code of working capability which i can read to understand better what and where should be done?

[nenikitov]

Ok, thank you. I will try to make it work, i guess it should be better. If something doesnt work, i will ask it.

[nenikitov]

After creating a PlayerCapabilities class and making it implement ICapabilitySerializable, importing everything and adding unemplemented methods i get this:

package com.nenikitov.nemod;

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

public class PlayerCapabilities implements ICapabilitySerializable<INBT>
{
	@Override
	public <T> LazyOptional<T> getCapability(Capability<T> cap, Direction side) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public INBT serializeNBT() {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void deserializeNBT(INBT nbt) {
		// TODO Auto-generated method stub
		
	}

}

1. Its here after "public class PlayerCapabilities implements ICapabilitySerializable<INBT> {" that I should write all my new variables that I want to add as stats to the player, right?

 

2. When i'm regestering PlayerCapabilities (i'm doing it inside FMLCommonSetupEvent in my mod class), what should i put as storage and factory?

CapabilityManager.INSTANCE.register(PlayerCapabilities.class, storage, factory);

 

3. For adding capabilities to the PLayerEntity, in my mod calss i wrote

private static ResourceLocation PlayerCapabilitiesResourceLocation = new ResourceLocation(modid, "player_capabilities");

And then i wrote this method

	@SubscribeEvent
	public static void attachPlayerCapabilities(AttachCapabilitiesEvent<Entity> event)
	{
		if (event.getObject() instanceof PlayerEntity)
		{
			event.addCapability(PlayerCapabilitiesResourceLocation, cap);
		}
	}

What should go in cap?

[Kenneth201998]

1 hour ago, nenikitov said:

After creating a PlayerCapabilities class and making it implement ICapabilitySerializable, importing everything and adding unemplemented methods i get this:

package com.nenikitov.nemod;

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

public class PlayerCapabilities implements ICapabilitySerializable<INBT>
{
	@Override
	public <T> LazyOptional<T> getCapability(Capability<T> cap, Direction side) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public INBT serializeNBT() {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void deserializeNBT(INBT nbt) {
		// TODO Auto-generated method stub
		
	}

}

1. Its here after "public class PlayerCapabilities implements ICapabilitySerializable<INBT> {" that I should write all my new variables that I want to add as stats to the player, right?

 

2. When i'm regestering PlayerCapabilities (i'm doing it inside FMLCommonSetupEvent in my mod class), what should i put as storage and factory?

CapabilityManager.INSTANCE.register(PlayerCapabilities.class, storage, factory);

 

3. For adding capabilities to the PLayerEntity, in my mod calss i wrote

private static ResourceLocation PlayerCapabilitiesResourceLocation = new ResourceLocation(modid, "player_capabilities");

And then i wrote this method

	@SubscribeEvent
	public static void attachPlayerCapabilities(AttachCapabilitiesEvent<Entity> event)
	{
		if (event.getObject() instanceof PlayerEntity)
		{
			event.addCapability(PlayerCapabilitiesResourceLocation, cap);
		}
	}

What should go in cap?

Sounds like the capability you are trying to create should go in "cap".

 

I have created a custom capability for tile entities and am also looking for an answer to this. I too would like more information. 

Edited December 1, 2019 by Kenneth201998

[Cerandior]

9 hours ago, Kenneth201998 said:

Sounds like the capability you are trying to create should go in "cap".

 

I have created a custom capability for tile entities and am also looking for an answer to this. I too would like more information. 

At cap, you should pass a new instance of the default implementation for your capability. I just got into capabilities myself lately, and they are a handful if you never worked with such things before. Very tricky to get things working because the docs are a little outdated.

[nenikitov]

4 hours ago, Cerandior said:

At cap, you should pass a new instance of the default implementation for your capability. I just got into capabilities myself lately, and they are a handful if you never worked with such things before. Very tricky to get things working because the docs are a little outdated.

Did you succeed on making a custom working capability?

[Cerandior]

1 minute ago, nenikitov said:

Did you succeed on making a custom working capability?

Yes, if you want to have a look at it, go here: https://github.com/Cerandior/VanillaExtended/tree/master/src/main/java/teabx/vanillaextended

I got my Event Handler under "main" package.

[Kenneth201998]

What I am wondering is how to make the capability apply to the player. 

[Cerandior]

2 minutes ago, Kenneth201998 said:

What I am wondering is how to make the capability apply to the player. 

Quote

• AttachCapabilitiesEvent<Entity>: Fires only for entities.
• AttachCapabilitiesEvent<TileEntity>: Fires only for tile entities.
• AttachCapabilitiesEvent<ItemStack>: Fires only for item stacks.
• AttachCapabilitiesEvent<World>: Fires only for worlds.
• AttachCapabilitiesEvent<Chunk>: Fires only for chunks.

That's from the docs. Those are the events you must subscribe to depending on what type of thing you want to attach your capability. In your case. You use the one for entities and check if the entity is an instance of a player. If yes, attach it to that player.

 

 

[nenikitov]

10 minutes ago, Cerandior said:

Yes, if you want to have a look at it, go here: https://github.com/Cerandior/VanillaExtended/tree/master/src/main/java/teabx/vanillaextended

I got my Event Handler under "main" package.

OK, thank you.

I hope it helps me because all the tutorials and examples i saw, they wrote all differently + they were outdated.

 

6 minutes ago, Kenneth201998 said:

What I am wondering is how to make the capability apply to the player. 

@SubscribeEvent
public static void attachPlayerCapabilities(AttachCapabilitiesEvent<Entity> event)
	{
		if (event.getObject() instanceof PlayerEntity)
		{
			event.addCapability();
		}

But the line event.addCapability(); isnt finished and there should be something written inside () , still dont know what because i didnt get to this point

Edited December 1, 2019 by nenikitov

[Cerandior]

18 minutes ago, nenikitov said:

OK, thank you.

I hope it helps me because all the tutorials and examples i saw, they wrote all differently + they were outdated.

 

@SubscribeEvent
public static void attachPlayerCapabilities(AttachCapabilitiesEvent<Entity> event)
	{
		if (event.getObject() instanceof PlayerEntity)
		{
			event.addCapability();
		}

But the line event.addCapability(); isnt finished and there should be something written inside () , still dont know what because i didnt get to this point

The first parameter you pass is a resource location containing your modid and a string name for your capability.
The second parameter, you have to pass a new instance of the default implementation of your capability.

This what I did and it works: https://github.com/Cerandior/VanillaExtended/blob/master/src/main/java/teabx/vanillaextended/main/EventHandler.java

[nenikitov]

Any idea why this is happening?

In CapabilityRegistry

@Override
public INBT writeNBT(Capability<INeModPlayerCapabilities> capability, INeModPlayerCapabilities instance, Direction side)
{
	CompoundNBT nbt = new CompoundNBT();
    nbt.putDouble("stamina", instance.GetStamina());
    return nbt;
}

I get "GetStamina()" unerlined red

Although I have this method in my INeModPlayerCapabilities

public double GetStamina();

And inide my NeModPlayerCapabilities

@Override
	public double GetStamina() {
		return this.Stamina;
	}

 

 

 

Actually same thing with

@Override
	public void readNBT(Capability<INeModPlayerCapabilities> capability, INeModPlayerCapabilities instance, Direction side, INBT nbt)
	{
		CompoundNBT tag = (CompoundNBT) nbt;
		instance.SetStaminaValue(tag.getDouble("stamina"));
	}

Edited December 1, 2019 by nenikitov

[nenikitov]

The method SetStaminaValue(double) is undefined for the type CapabilityRegestry.INeModPlayerCapabilities

[nenikitov]

package com.nenikitov.nemod.playerCapabilities;

import javax.annotation.Nullable;

import net.minecraft.nbt.CompoundNBT;
import net.minecraft.nbt.INBT;
import net.minecraft.util.Direction;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.CapabilityInject;
import net.minecraftforge.common.capabilities.CapabilityManager;

public class CapabilityRegestry
{
	@CapabilityInject(INeModPlayerCapabilities.class)
    public static Capability<INeModPlayerCapabilities> COOLDOWN_ITEM = null;

    public static void registerCapabilities(){
        CapabilityManager.INSTANCE.register(INeModPlayerCapabilities.class, new INeModPlayerCapabilities() ,INeModPlayerCapabilities::new);
    }

    public static class INeModPlayerCapabilities implements Capability.IStorage<INeModPlayerCapabilities>{

		@Override
		public INBT writeNBT(Capability<INeModPlayerCapabilities> capability, INeModPlayerCapabilities instance, Direction side)
		{
			CompoundNBT nbt = new CompoundNBT();
            nbt.putDouble("stamina", instance.GetStamina());
            return nbt;
		}

		@Override
		public void readNBT(Capability<INeModPlayerCapabilities> capability, INeModPlayerCapabilities instance, Direction side, INBT nbt)
		{
	            CompoundNBT tag = (CompoundNBT) nbt;
	            instance.SetStaminaValue(tag.getDouble("stamina"));
		}


    }
}

Yeah, but it shouldnt get these 2 methods from INeModPlayerCapabilities?

[Cerandior]

1 minute ago, nenikitov said:

package com.nenikitov.nemod.playerCapabilities;

import javax.annotation.Nullable;

import net.minecraft.nbt.CompoundNBT;
import net.minecraft.nbt.INBT;
import net.minecraft.util.Direction;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.CapabilityInject;
import net.minecraftforge.common.capabilities.CapabilityManager;

public class CapabilityRegestry
{
	@CapabilityInject(INeModPlayerCapabilities.class)
    public static Capability<INeModPlayerCapabilities> COOLDOWN_ITEM = null;

    public static void registerCapabilities(){
        CapabilityManager.INSTANCE.register(INeModPlayerCapabilities.class, new INeModPlayerCapabilities() ,INeModPlayerCapabilities::new);
    }

    public static class INeModPlayerCapabilities implements Capability.IStorage<INeModPlayerCapabilities>{

		@Override
		public INBT writeNBT(Capability<INeModPlayerCapabilities> capability, INeModPlayerCapabilities instance, Direction side)
		{
			CompoundNBT nbt = new CompoundNBT();
            nbt.putDouble("stamina", instance.GetStamina());
            return nbt;
		}

		@Override
		public void readNBT(Capability<INeModPlayerCapabilities> capability, INeModPlayerCapabilities instance, Direction side, INBT nbt)
		{
	            CompoundNBT tag = (CompoundNBT) nbt;
	            instance.SetStaminaValue(tag.getDouble("stamina"));
		}


    }
}

Yeah, but it shouldnt get these 2 methods from INeModPlayerCapabilities?

Where you register the capability, at the second parameter you don't pass an instance of your capability interface. You have to pass an instance of your storage class. The last parameter is a new instance of your default implementation of your capability. The one that implements your interface.

Edited December 1, 2019 by Cerandior

[Cerandior]

Just a note. Don't just copy and paste the code I gave you. I have nothing against it, but if you don't understand what's going on then It's kind of pointless because even if you get it working, you won't be able to change anything.

Also, for some of those methods, like the one that registers your capability, you can use your IDE to get to an implementation of that method to see what exactly that method is expecting for parameters, and what it does with them (ctl+b if on IntelliJ).

Edited December 1, 2019 by Cerandior

[nenikitov]

Yeah, my fault. Passed the wrong thing. I should recreate all first and then see what is and what isnt working.

Nevermind about 

6 minutes ago, nenikitov said:

Yeah, but it shouldnt get these 2 methods from INeModPlayerCapabilities?

 

[nenikitov]

Just now, Cerandior said:

Just a note. Don't just copy and paste the code I gave you. I have nothing against it, but if you don't understand what's going on then It's kind of pointless because even if you get it working, you won't be able to change anything.

Also, for some of those methods, like the one that registers your capability, you can use your IDE to get to an implementation of that method to see what exactly that method is expecting for parameters, and what it does with it (ctl+b if on IntelliJ).

Yeah, I know and I'm getting whats happening.

And sorry about copying your code.

[nenikitov]

So, after spending almost the whole day reading and rereading different tutorials, forum topics and source codes, after restarting 5 times i still didnt make it XD.

I get a crash while attaching capabilities on PlayerEntity, more precisely on calling event.getObject() inside NeModEventHandler;

Here are classes, their code and crash report:

 

NeModEventHandler:

Spoiler

package com.nenikitov.nemod;

import com.nenikitov.nemod.playerCapabilities.NePlayerCapabilitiesProvider;

import net.minecraft.entity.Entity;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.event.AttachCapabilitiesEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;

public class NeModEventHandler
{
	@SubscribeEvent
	public static void onAttachCapabilities(AttachCapabilitiesEvent<Entity> event) {
		if (event.getObject() instanceof PlayerEntity && event.getObject() != null) {
			System.out.println("Capability is attached to " + event.getObject());
			event.addCapability(new ResourceLocation(NeMod.modid, "ne_player_capabilities"), new NePlayerCapabilitiesProvider());
		}
	}

}

 

INePlayerCapabilities:

Spoiler

package com.nenikitov.nemod.playerCapabilities;

public interface INePlayerCapabilities
{
	//STAMINA
		//Set
		void SetStamina(double value);
		void SetStaminaDecrease(double value);
		void SetMaxStamina(double value);
		//Get
		double GetStamina();
		double GetStaminaDecrease();
		double GetMaxStamina();
		//Update
		void StaminaUpdate();
		
	//DASH
		//Set
		void SetDashLength(double value);
		//Get
		double GetDashLength();
		//Update
		void UpdateDashLength();
		
	//DASH COOL DOWN
		//Set
		void SetDashCoolDownValue(double value);
		void SetDashCoolDownTime(double value);
		void SetDashIsOnCoolDown(boolean  value);
		//Get
		double GetDashCoolDownValue();
		double GetDashCoolDownTime();
		boolean GetDashIsOnCoolDown();
		//Update
		void DashCoolDownUpdate();
	
	//ARMOR CLASSES
		//Set
		void SetBootsArmorClass(String value);
		void SetLeggingsArmorClass(String value);
		void SetChestplateArmorClass(String value);
		void SetHelmetArmorClass(String value);
		//Get
		String GetBootsArmorClassString();
		String GetLeggingsArmorClass();
		String GetChestplateArmorClass();
		String GetHelmetArmorClass();
		//Update
		void UpdateArmorClasses();
}

 

NePlayerCapabilities:

Spoiler

package com.nenikitov.nemod.playerCapabilities;

public class NePlayerCapabilities implements INePlayerCapabilities
{
	//Stamina variables
	private double Stamina = 1;
	private double StaminaDecreaseValue = 0.1;
	private double MaxStamina = 1;
	//Dash variables
	private double DashLength = 0.35;
	//Cool down on dash variables
	private double DashCoolDownValue = 0;
	private double DashCoolDownTime = 2;
	private boolean DashIsOnCooldown = false;
	//Armor class variables
	private String BootsArmorCalss = "air";
	private String LeggingsArmorCalss = "air";
	private String ChestplateArmorCalss = "air";
	private String HelmetArmorCalss = "air";
	
	public NePlayerCapabilities() {
		this.Stamina = 1;
		this.StaminaDecreaseValue = 0.1;
		this.MaxStamina = 1;
		this.DashLength = 0.35;
		this.DashCoolDownValue = 0;
		this.DashCoolDownTime = 2;
		this.DashIsOnCooldown = false;
		this.BootsArmorCalss = "air";
		this.LeggingsArmorCalss = "air";
		this.ChestplateArmorCalss = "air";
		this.HelmetArmorCalss = "air";
	}
	
	//STAMINA
		//Set
	@Override
		public void SetStamina(double value) {
			this.Stamina = value;
		}
		@Override
		public void SetStaminaDecrease(double value) {
			this.StaminaDecreaseValue = value;
		}
		@Override
		public void SetMaxStamina(double value) {
			this.MaxStamina = value;
		}
		//Get
		@Override
		public double GetStamina() {
			return this.Stamina;
		}
		@Override
		public double GetStaminaDecrease() {
			return this.StaminaDecreaseValue;
		}
		@Override
		public double GetMaxStamina() {
			return this.MaxStamina;
		}
		//Update
		@Override
		public void StaminaUpdate() {
		//TODO
		}
	
	//DASH
		//Set
		@Override
		public void SetDashLength(double value) {
			this.DashLength = value;
		}
		//Get
		@Override
		public double GetDashLength() {
			return this.DashLength;
		}
		//Update	
		@Override
		public void UpdateDashLength() {
			// TODO
		}
	
	//DASH COOL DOWN
		//Set
		@Override
		public void SetDashCoolDownValue(double value) {
			this.DashCoolDownValue = value;
		}
		@Override
		public void SetDashCoolDownTime(double value) {
			this.DashCoolDownTime = value;
		}
		@Override
		public void SetDashIsOnCoolDown(boolean value) {
			this.DashIsOnCooldown = value;
		}
		//Get
		@Override
		public double GetDashCoolDownValue() {
			return this.DashCoolDownValue;
		}
		@Override
		public double GetDashCoolDownTime() {
			return this.DashCoolDownTime;
		}
		@Override
		public boolean GetDashIsOnCoolDown() {
			return this.DashIsOnCooldown;
		}
		//Update
		@Override
		public void DashCoolDownUpdate() {
			// TODO
		}
	
	//ARMOR CLASSES
		//Set
		@Override
		public void SetBootsArmorClass(String value) {
			this.BootsArmorCalss = value;
		}
		@Override
		public void SetLeggingsArmorClass(String value) {
			this.LeggingsArmorCalss = value;
		}
		@Override
		public void SetChestplateArmorClass(String value) {
			this.ChestplateArmorCalss = value;
		}
		@Override
		public void SetHelmetArmorClass(String value) {
			this.HelmetArmorCalss = value;
			
		}
		//Get
		@Override
		public String GetBootsArmorClassString() {
			return this.BootsArmorCalss;
		}
		@Override
		public String GetLeggingsArmorClass() {
			return this.LeggingsArmorCalss;
		}
		@Override
		public String GetChestplateArmorClass() {
			return this.ChestplateArmorCalss;
		}
		@Override
		public String GetHelmetArmorClass() {
			return this.HelmetArmorCalss;
		}
		//Update
		@Override
		public void UpdateArmorClasses() {
		}

}

 

NePlayerCapabilitiesProvider:

Spoiler

package com.nenikitov.nemod.playerCapabilities;

import net.minecraft.nbt.INBT;
import net.minecraft.util.Direction;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.CapabilityInject;
import net.minecraftforge.common.capabilities.ICapabilitySerializable;
import net.minecraftforge.common.util.LazyOptional;

public class NePlayerCapabilitiesProvider implements ICapabilitySerializable<INBT> {

	@CapabilityInject(INePlayerCapabilities.class)
	public static final Capability<INePlayerCapabilities> I_NE_PLAYER_CAPABILITIES = null;

	private LazyOptional<INePlayerCapabilities> InterfaceInstance = LazyOptional.of(I_NE_PLAYER_CAPABILITIES::getDefaultInstance);

	
	@Override
	public <T> LazyOptional<T> getCapability(Capability<T> cap, Direction side)
	{
		if (cap == I_NE_PLAYER_CAPABILITIES)
			return InterfaceInstance.cast();
		else
			return LazyOptional.empty();
	}

	@Override
	public INBT serializeNBT() {
		return I_NE_PLAYER_CAPABILITIES.getStorage().writeNBT(I_NE_PLAYER_CAPABILITIES, this.InterfaceInstance.orElseThrow(() -> new IllegalArgumentException("LazyOptional must not be empty!")), null);
	}

	@Override
	public void deserializeNBT(INBT nbt) {
		I_NE_PLAYER_CAPABILITIES.getStorage().readNBT(I_NE_PLAYER_CAPABILITIES, this.InterfaceInstance.orElseThrow(() -> new IllegalArgumentException("LazyOptional must not be empty!")), null, nbt);
	}

}

 

NePlayerCapabilitiesStorage:

Spoiler

package com.nenikitov.nemod.playerCapabilities;

import com.nenikitov.nemod.NeMod;

import net.minecraft.nbt.CompoundNBT;
import net.minecraft.nbt.INBT;
import net.minecraft.util.Direction;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.Capability.IStorage;

public class NePlayerCapabilitiesStorage implements IStorage<INePlayerCapabilities>
{	
	//Capabilities methods
	@Override
	public INBT writeNBT(Capability<INePlayerCapabilities> capability, INePlayerCapabilities instance, Direction side)
	{
		CompoundNBT CNBT = new CompoundNBT();
		//Stamina values
		CNBTPutDouble(CNBT, "stamina", instance.GetStamina());
		CNBTPutDouble(CNBT, "stamina_decrease", instance.GetStaminaDecrease());
		CNBTPutDouble(CNBT, "max_stamina", instance.GetMaxStamina());
		//Dash values
		CNBTPutDouble(CNBT, "dash_length", instance.GetDashLength());
		//Dash cool down values
		CNBTPutDouble(CNBT, "dash_cool_down_value", instance.GetDashCoolDownValue());
		CNBTPutDouble(CNBT, "dash_cool_down_time", instance.GetDashCoolDownTime());
		CNBTPutBoolean(CNBT, "dash_is_on_cool_down", instance.GetDashIsOnCoolDown());
		//Armor classes values
		CNBTPutString(CNBT, "boots_armor_class", instance.GetBootsArmorClassString());
		CNBTPutString(CNBT, "leggings_armor_class", instance.GetLeggingsArmorClass());
		CNBTPutString(CNBT, "chestplate_armor_class", instance.GetChestplateArmorClass());
		CNBTPutString(CNBT, "helmet_armor_class", instance.GetHelmetArmorClass());
		return CNBT;
	}

	@Override
	public void readNBT(Capability<INePlayerCapabilities> capability, INePlayerCapabilities instance, Direction side, INBT nbt)
	{
		System.out.println("read NBT");
		//Stamina values
		instance.SetStamina(NBTGetDouble(nbt, "stamina"));
		instance.SetStaminaDecrease(NBTGetDouble(nbt, "stamina_decrease"));
		instance.SetMaxStamina(NBTGetDouble(nbt, "max_stamina"));
		//Dash values
		instance.SetDashLength(NBTGetDouble(nbt, "dash_length"));
		//Dash cool down values
		instance.SetDashCoolDownValue(NBTGetDouble(nbt, "dash_cool_down_value"));
		instance.SetDashCoolDownTime(NBTGetDouble(nbt, "dash_cool_down_time"));
		instance.SetDashIsOnCoolDown(NBTGetBoolean(nbt, "dash_is_on_cool_down"));
		//Armor classes values
		instance.SetBootsArmorClass(NBTGetString(nbt, "boots_armor_class"));
		instance.SetLeggingsArmorClass(NBTGetString(nbt, "leggings_armor_class"));
		instance.SetChestplateArmorClass(NBTGetString(nbt, "chestplate_armor_class"));
		instance.SetHelmetArmorClass(NBTGetString(nbt, "helmet_armor_class"));
	}

	
	//Helper methods
	private void CNBTPutDouble(CompoundNBT cnbt, String name, double value)
	{
		cnbt.putDouble(NBTKey(name), value);
	}
	private void CNBTPutBoolean(CompoundNBT cnbt, String name, boolean value)
	{
		cnbt.putBoolean(NBTKey(name), value);
	}
	private void CNBTPutString(CompoundNBT cnbt, String name, String value)
	{
		cnbt.putString(NBTKey(name), value);
	}
	private double NBTGetDouble(INBT nbt,  String name)
	{
		return ((CompoundNBT)nbt).getDouble(NBTKey(name));
	}
	private boolean NBTGetBoolean(INBT nbt,  String name)
	{
		return ((CompoundNBT)nbt).getBoolean(NBTKey(name));
	}
	private String NBTGetString(INBT nbt,  String name)
	{
		return ((CompoundNBT)nbt).getString(NBTKey(name));
	}
	private String NBTKey(String key)
	{
		return NeMod.modid + "_" + key;
	}
}

 

 

And here is my crash report:

Spoiler

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 01.12.19 21:51
Description: Ticking memory connection

java.lang.NullPointerException: Ticking memory connection
    at net.minecraft.entity.player.PlayerEntity.getName(PlayerEntity.java:1858) ~[?:?] {pl:accesstransformer:B}
    at net.minecraft.entity.Entity.toString(Entity.java:2361) ~[?:?] {pl:accesstransformer:B}
    at java.lang.String.valueOf(Unknown Source) ~[?:1.8.0_231] {}
    at java.lang.StringBuilder.append(Unknown Source) ~[?:1.8.0_231] {}
    at com.nenikitov.nemod.NeModEventHandler.onAttachCapabilities(NeModEventHandler.java:16) ~[main/:?] {}
    at net.minecraftforge.eventbus.ASMEventHandler_0_NeModEventHandler_onAttachCapabilities_AttachCapabilitiesEvent.invoke(.dynamic) ~[?:?] {}
    at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80) ~[eventbus-1.0.0-service.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258) ~[eventbus-1.0.0-service.jar:?] {}
    at net.minecraftforge.event.ForgeEventFactory.gatherCapabilities(ForgeEventFactory.java:560) ~[?:?] {}
    at net.minecraftforge.event.ForgeEventFactory.gatherCapabilities(ForgeEventFactory.java:554) ~[?:?] {}
    at net.minecraftforge.common.capabilities.CapabilityProvider.gatherCapabilities(CapabilityProvider.java:48) ~[?:?] {}
    at net.minecraftforge.common.capabilities.CapabilityProvider.gatherCapabilities(CapabilityProvider.java:44) ~[?:?] {}
    at net.minecraft.entity.Entity.<init>(Entity.java:222) ~[?:?] {pl:accesstransformer:B}
    at net.minecraft.entity.LivingEntity.<init>(LivingEntity.java:192) ~[?:?] {}
    at net.minecraft.entity.player.PlayerEntity.<init>(PlayerEntity.java:162) ~[?:?] {pl:accesstransformer:B}
    at net.minecraft.entity.player.ServerPlayerEntity.<init>(ServerPlayerEntity.java:163) ~[?:?] {pl:accesstransformer:B}
    at net.minecraft.server.management.PlayerList.createPlayerForUser(PlayerList.java:390) ~[?:?] {}
    at net.minecraft.network.login.ServerLoginNetHandler.tryAcceptPlayer(ServerLoginNetHandler.java:119) ~[?:?] {}
    at net.minecraft.network.login.ServerLoginNetHandler.tick(ServerLoginNetHandler.java:63) ~[?:?] {}
    at net.minecraft.network.NetworkManager.tick(NetworkManager.java:241) ~[?:?] {}
    at net.minecraft.network.NetworkSystem.tick(NetworkSystem.java:148) ~[?:?] {}
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:882) ~[?:?] {pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:800) ~[?:?] {pl:accesstransformer:B}
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:118) ~[?:?] {pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:646) [?:?] {pl:accesstransformer:B}
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_231] {}

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

-- Head --
Thread: Server thread
Stacktrace:
    at net.minecraft.entity.player.PlayerEntity.getName(PlayerEntity.java:1858)
    at net.minecraft.entity.Entity.toString(Entity.java:2361)
    at java.lang.String.valueOf(Unknown Source)
    at java.lang.StringBuilder.append(Unknown Source)
    at com.nenikitov.nemod.NeModEventHandler.onAttachCapabilities(NeModEventHandler.java:16)
    at net.minecraftforge.eventbus.ASMEventHandler_0_NeModEventHandler_onAttachCapabilities_AttachCapabilitiesEvent.invoke(.dynamic)
    at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80)
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258)
    at net.minecraftforge.event.ForgeEventFactory.gatherCapabilities(ForgeEventFactory.java:560)
    at net.minecraftforge.event.ForgeEventFactory.gatherCapabilities(ForgeEventFactory.java:554)
    at net.minecraftforge.common.capabilities.CapabilityProvider.gatherCapabilities(CapabilityProvider.java:48)
    at net.minecraftforge.common.capabilities.CapabilityProvider.gatherCapabilities(CapabilityProvider.java:44)
    at net.minecraft.entity.Entity.<init>(Entity.java:222)
    at net.minecraft.entity.LivingEntity.<init>(LivingEntity.java:192)
    at net.minecraft.entity.player.PlayerEntity.<init>(PlayerEntity.java:162)
    at net.minecraft.entity.player.ServerPlayerEntity.<init>(ServerPlayerEntity.java:163)
    at net.minecraft.server.management.PlayerList.createPlayerForUser(PlayerList.java:390)
    at net.minecraft.network.login.ServerLoginNetHandler.tryAcceptPlayer(ServerLoginNetHandler.java:119)
    at net.minecraft.network.login.ServerLoginNetHandler.tick(ServerLoginNetHandler.java:63)
    at net.minecraft.network.NetworkManager.tick(NetworkManager.java:241)

-- Ticking connection --
Details:
    Connection: net.minecraft.network.NetworkManager@c594c87
Stacktrace:
    at net.minecraft.network.NetworkSystem.tick(NetworkSystem.java:148)
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:882)
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:800)
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:118)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:646)
    at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
    Minecraft Version: 1.14.4
    Minecraft Version ID: 1.14.4
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_231, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 692512840 bytes (660 MB) / 2216165376 bytes (2113 MB) up to 3799515136 bytes (3623 MB)
    CPUs: 8
    JVM Flags: 1 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
    ModLauncher: 3.2.0+60+b86c1d4
    ModLauncher launch target: fmluserdevclient
    ModLauncher naming: mcp
    ModLauncher services: 
        /eventbus-1.0.0-service.jar eventbus PLUGINSERVICE 
        /forge-1.14.4-28.1.0_mapped_snapshot_20190719-1.14.3-launcher.jar object_holder_definalize PLUGINSERVICE 
        /forge-1.14.4-28.1.0_mapped_snapshot_20190719-1.14.3-launcher.jar runtime_enum_extender PLUGINSERVICE 
        /accesstransformers-1.0.0-shadowed.jar accesstransformer PLUGINSERVICE 
        /forge-1.14.4-28.1.0_mapped_snapshot_20190719-1.14.3-launcher.jar capability_inject_definalize PLUGINSERVICE 
        /forge-1.14.4-28.1.0_mapped_snapshot_20190719-1.14.3-launcher.jar runtimedistcleaner PLUGINSERVICE 
        /forge-1.14.4-28.1.0_mapped_snapshot_20190719-1.14.3-launcher.jar fml TRANSFORMATIONSERVICE 
    FML: 28.1
    Forge: net.minecraftforge:28.1.0
    FML Language Providers: 
        [email protected]
        minecraft@1
    Mod List: 
        forge-1.14.4-28.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar Forge {[email protected] DONE}
        main NE Mod {[email protected] DONE}
        client-extra.jar Minecraft {[email protected] DONE}
    Player Count: 0 / 8; []
    Data Packs: vanilla, mod:nemod, mod:forge
    Type: Integrated Server (map_client.txt)
    Is Modded: Definitely; Client brand changed to 'forge'

Any ideas what is happening?

[Cerandior]

4 hours ago, nenikitov said:

So, after spending almost the whole day reading and rereading different tutorials, forum topics and source codes, after restarting 5 times i still didnt make it XD.

I get a crash while attaching capabilities on PlayerEntity, more precisely on calling event.getObject() inside NeModEventHandler;

Here are classes, their code and crash report:

 

NeModEventHandler:

  Reveal hidden contents

package com.nenikitov.nemod;

import com.nenikitov.nemod.playerCapabilities.NePlayerCapabilitiesProvider;

import net.minecraft.entity.Entity;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.event.AttachCapabilitiesEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;

public class NeModEventHandler
{
	@SubscribeEvent
	public static void onAttachCapabilities(AttachCapabilitiesEvent<Entity> event) {
		if (event.getObject() instanceof PlayerEntity && event.getObject() != null) {
			System.out.println("Capability is attached to " + event.getObject());
			event.addCapability(new ResourceLocation(NeMod.modid, "ne_player_capabilities"), new NePlayerCapabilitiesProvider());
		}
	}

}

 

INePlayerCapabilities:

  Reveal hidden contents

package com.nenikitov.nemod.playerCapabilities;

public interface INePlayerCapabilities
{
	//STAMINA
		//Set
		void SetStamina(double value);
		void SetStaminaDecrease(double value);
		void SetMaxStamina(double value);
		//Get
		double GetStamina();
		double GetStaminaDecrease();
		double GetMaxStamina();
		//Update
		void StaminaUpdate();
		
	//DASH
		//Set
		void SetDashLength(double value);
		//Get
		double GetDashLength();
		//Update
		void UpdateDashLength();
		
	//DASH COOL DOWN
		//Set
		void SetDashCoolDownValue(double value);
		void SetDashCoolDownTime(double value);
		void SetDashIsOnCoolDown(boolean  value);
		//Get
		double GetDashCoolDownValue();
		double GetDashCoolDownTime();
		boolean GetDashIsOnCoolDown();
		//Update
		void DashCoolDownUpdate();
	
	//ARMOR CLASSES
		//Set
		void SetBootsArmorClass(String value);
		void SetLeggingsArmorClass(String value);
		void SetChestplateArmorClass(String value);
		void SetHelmetArmorClass(String value);
		//Get
		String GetBootsArmorClassString();
		String GetLeggingsArmorClass();
		String GetChestplateArmorClass();
		String GetHelmetArmorClass();
		//Update
		void UpdateArmorClasses();
}

 

NePlayerCapabilities:

  Reveal hidden contents

package com.nenikitov.nemod.playerCapabilities;

public class NePlayerCapabilities implements INePlayerCapabilities
{
	//Stamina variables
	private double Stamina = 1;
	private double StaminaDecreaseValue = 0.1;
	private double MaxStamina = 1;
	//Dash variables
	private double DashLength = 0.35;
	//Cool down on dash variables
	private double DashCoolDownValue = 0;
	private double DashCoolDownTime = 2;
	private boolean DashIsOnCooldown = false;
	//Armor class variables
	private String BootsArmorCalss = "air";
	private String LeggingsArmorCalss = "air";
	private String ChestplateArmorCalss = "air";
	private String HelmetArmorCalss = "air";
	
	public NePlayerCapabilities() {
		this.Stamina = 1;
		this.StaminaDecreaseValue = 0.1;
		this.MaxStamina = 1;
		this.DashLength = 0.35;
		this.DashCoolDownValue = 0;
		this.DashCoolDownTime = 2;
		this.DashIsOnCooldown = false;
		this.BootsArmorCalss = "air";
		this.LeggingsArmorCalss = "air";
		this.ChestplateArmorCalss = "air";
		this.HelmetArmorCalss = "air";
	}
	
	//STAMINA
		//Set
	@Override
		public void SetStamina(double value) {
			this.Stamina = value;
		}
		@Override
		public void SetStaminaDecrease(double value) {
			this.StaminaDecreaseValue = value;
		}
		@Override
		public void SetMaxStamina(double value) {
			this.MaxStamina = value;
		}
		//Get
		@Override
		public double GetStamina() {
			return this.Stamina;
		}
		@Override
		public double GetStaminaDecrease() {
			return this.StaminaDecreaseValue;
		}
		@Override
		public double GetMaxStamina() {
			return this.MaxStamina;
		}
		//Update
		@Override
		public void StaminaUpdate() {
		//TODO
		}
	
	//DASH
		//Set
		@Override
		public void SetDashLength(double value) {
			this.DashLength = value;
		}
		//Get
		@Override
		public double GetDashLength() {
			return this.DashLength;
		}
		//Update	
		@Override
		public void UpdateDashLength() {
			// TODO
		}
	
	//DASH COOL DOWN
		//Set
		@Override
		public void SetDashCoolDownValue(double value) {
			this.DashCoolDownValue = value;
		}
		@Override
		public void SetDashCoolDownTime(double value) {
			this.DashCoolDownTime = value;
		}
		@Override
		public void SetDashIsOnCoolDown(boolean value) {
			this.DashIsOnCooldown = value;
		}
		//Get
		@Override
		public double GetDashCoolDownValue() {
			return this.DashCoolDownValue;
		}
		@Override
		public double GetDashCoolDownTime() {
			return this.DashCoolDownTime;
		}
		@Override
		public boolean GetDashIsOnCoolDown() {
			return this.DashIsOnCooldown;
		}
		//Update
		@Override
		public void DashCoolDownUpdate() {
			// TODO
		}
	
	//ARMOR CLASSES
		//Set
		@Override
		public void SetBootsArmorClass(String value) {
			this.BootsArmorCalss = value;
		}
		@Override
		public void SetLeggingsArmorClass(String value) {
			this.LeggingsArmorCalss = value;
		}
		@Override
		public void SetChestplateArmorClass(String value) {
			this.ChestplateArmorCalss = value;
		}
		@Override
		public void SetHelmetArmorClass(String value) {
			this.HelmetArmorCalss = value;
			
		}
		//Get
		@Override
		public String GetBootsArmorClassString() {
			return this.BootsArmorCalss;
		}
		@Override
		public String GetLeggingsArmorClass() {
			return this.LeggingsArmorCalss;
		}
		@Override
		public String GetChestplateArmorClass() {
			return this.ChestplateArmorCalss;
		}
		@Override
		public String GetHelmetArmorClass() {
			return this.HelmetArmorCalss;
		}
		//Update
		@Override
		public void UpdateArmorClasses() {
		}

}

 

NePlayerCapabilitiesProvider:

  Reveal hidden contents

package com.nenikitov.nemod.playerCapabilities;

import net.minecraft.nbt.INBT;
import net.minecraft.util.Direction;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.CapabilityInject;
import net.minecraftforge.common.capabilities.ICapabilitySerializable;
import net.minecraftforge.common.util.LazyOptional;

public class NePlayerCapabilitiesProvider implements ICapabilitySerializable<INBT> {

	@CapabilityInject(INePlayerCapabilities.class)
	public static final Capability<INePlayerCapabilities> I_NE_PLAYER_CAPABILITIES = null;

	private LazyOptional<INePlayerCapabilities> InterfaceInstance = LazyOptional.of(I_NE_PLAYER_CAPABILITIES::getDefaultInstance);

	
	@Override
	public <T> LazyOptional<T> getCapability(Capability<T> cap, Direction side)
	{
		if (cap == I_NE_PLAYER_CAPABILITIES)
			return InterfaceInstance.cast();
		else
			return LazyOptional.empty();
	}

	@Override
	public INBT serializeNBT() {
		return I_NE_PLAYER_CAPABILITIES.getStorage().writeNBT(I_NE_PLAYER_CAPABILITIES, this.InterfaceInstance.orElseThrow(() -> new IllegalArgumentException("LazyOptional must not be empty!")), null);
	}

	@Override
	public void deserializeNBT(INBT nbt) {
		I_NE_PLAYER_CAPABILITIES.getStorage().readNBT(I_NE_PLAYER_CAPABILITIES, this.InterfaceInstance.orElseThrow(() -> new IllegalArgumentException("LazyOptional must not be empty!")), null, nbt);
	}

}

 

NePlayerCapabilitiesStorage:

  Reveal hidden contents

package com.nenikitov.nemod.playerCapabilities;

import com.nenikitov.nemod.NeMod;

import net.minecraft.nbt.CompoundNBT;
import net.minecraft.nbt.INBT;
import net.minecraft.util.Direction;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.Capability.IStorage;

public class NePlayerCapabilitiesStorage implements IStorage<INePlayerCapabilities>
{	
	//Capabilities methods
	@Override
	public INBT writeNBT(Capability<INePlayerCapabilities> capability, INePlayerCapabilities instance, Direction side)
	{
		CompoundNBT CNBT = new CompoundNBT();
		//Stamina values
		CNBTPutDouble(CNBT, "stamina", instance.GetStamina());
		CNBTPutDouble(CNBT, "stamina_decrease", instance.GetStaminaDecrease());
		CNBTPutDouble(CNBT, "max_stamina", instance.GetMaxStamina());
		//Dash values
		CNBTPutDouble(CNBT, "dash_length", instance.GetDashLength());
		//Dash cool down values
		CNBTPutDouble(CNBT, "dash_cool_down_value", instance.GetDashCoolDownValue());
		CNBTPutDouble(CNBT, "dash_cool_down_time", instance.GetDashCoolDownTime());
		CNBTPutBoolean(CNBT, "dash_is_on_cool_down", instance.GetDashIsOnCoolDown());
		//Armor classes values
		CNBTPutString(CNBT, "boots_armor_class", instance.GetBootsArmorClassString());
		CNBTPutString(CNBT, "leggings_armor_class", instance.GetLeggingsArmorClass());
		CNBTPutString(CNBT, "chestplate_armor_class", instance.GetChestplateArmorClass());
		CNBTPutString(CNBT, "helmet_armor_class", instance.GetHelmetArmorClass());
		return CNBT;
	}

	@Override
	public void readNBT(Capability<INePlayerCapabilities> capability, INePlayerCapabilities instance, Direction side, INBT nbt)
	{
		System.out.println("read NBT");
		//Stamina values
		instance.SetStamina(NBTGetDouble(nbt, "stamina"));
		instance.SetStaminaDecrease(NBTGetDouble(nbt, "stamina_decrease"));
		instance.SetMaxStamina(NBTGetDouble(nbt, "max_stamina"));
		//Dash values
		instance.SetDashLength(NBTGetDouble(nbt, "dash_length"));
		//Dash cool down values
		instance.SetDashCoolDownValue(NBTGetDouble(nbt, "dash_cool_down_value"));
		instance.SetDashCoolDownTime(NBTGetDouble(nbt, "dash_cool_down_time"));
		instance.SetDashIsOnCoolDown(NBTGetBoolean(nbt, "dash_is_on_cool_down"));
		//Armor classes values
		instance.SetBootsArmorClass(NBTGetString(nbt, "boots_armor_class"));
		instance.SetLeggingsArmorClass(NBTGetString(nbt, "leggings_armor_class"));
		instance.SetChestplateArmorClass(NBTGetString(nbt, "chestplate_armor_class"));
		instance.SetHelmetArmorClass(NBTGetString(nbt, "helmet_armor_class"));
	}

	
	//Helper methods
	private void CNBTPutDouble(CompoundNBT cnbt, String name, double value)
	{
		cnbt.putDouble(NBTKey(name), value);
	}
	private void CNBTPutBoolean(CompoundNBT cnbt, String name, boolean value)
	{
		cnbt.putBoolean(NBTKey(name), value);
	}
	private void CNBTPutString(CompoundNBT cnbt, String name, String value)
	{
		cnbt.putString(NBTKey(name), value);
	}
	private double NBTGetDouble(INBT nbt,  String name)
	{
		return ((CompoundNBT)nbt).getDouble(NBTKey(name));
	}
	private boolean NBTGetBoolean(INBT nbt,  String name)
	{
		return ((CompoundNBT)nbt).getBoolean(NBTKey(name));
	}
	private String NBTGetString(INBT nbt,  String name)
	{
		return ((CompoundNBT)nbt).getString(NBTKey(name));
	}
	private String NBTKey(String key)
	{
		return NeMod.modid + "_" + key;
	}
}

 

 

And here is my crash report:

  Reveal hidden contents

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 01.12.19 21:51
Description: Ticking memory connection

java.lang.NullPointerException: Ticking memory connection
    at net.minecraft.entity.player.PlayerEntity.getName(PlayerEntity.java:1858) ~[?:?] {pl:accesstransformer:B}
    at net.minecraft.entity.Entity.toString(Entity.java:2361) ~[?:?] {pl:accesstransformer:B}
    at java.lang.String.valueOf(Unknown Source) ~[?:1.8.0_231] {}
    at java.lang.StringBuilder.append(Unknown Source) ~[?:1.8.0_231] {}
    at com.nenikitov.nemod.NeModEventHandler.onAttachCapabilities(NeModEventHandler.java:16) ~[main/:?] {}
    at net.minecraftforge.eventbus.ASMEventHandler_0_NeModEventHandler_onAttachCapabilities_AttachCapabilitiesEvent.invoke(.dynamic) ~[?:?] {}
    at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80) ~[eventbus-1.0.0-service.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258) ~[eventbus-1.0.0-service.jar:?] {}
    at net.minecraftforge.event.ForgeEventFactory.gatherCapabilities(ForgeEventFactory.java:560) ~[?:?] {}
    at net.minecraftforge.event.ForgeEventFactory.gatherCapabilities(ForgeEventFactory.java:554) ~[?:?] {}
    at net.minecraftforge.common.capabilities.CapabilityProvider.gatherCapabilities(CapabilityProvider.java:48) ~[?:?] {}
    at net.minecraftforge.common.capabilities.CapabilityProvider.gatherCapabilities(CapabilityProvider.java:44) ~[?:?] {}
    at net.minecraft.entity.Entity.<init>(Entity.java:222) ~[?:?] {pl:accesstransformer:B}
    at net.minecraft.entity.LivingEntity.<init>(LivingEntity.java:192) ~[?:?] {}
    at net.minecraft.entity.player.PlayerEntity.<init>(PlayerEntity.java:162) ~[?:?] {pl:accesstransformer:B}
    at net.minecraft.entity.player.ServerPlayerEntity.<init>(ServerPlayerEntity.java:163) ~[?:?] {pl:accesstransformer:B}
    at net.minecraft.server.management.PlayerList.createPlayerForUser(PlayerList.java:390) ~[?:?] {}
    at net.minecraft.network.login.ServerLoginNetHandler.tryAcceptPlayer(ServerLoginNetHandler.java:119) ~[?:?] {}
    at net.minecraft.network.login.ServerLoginNetHandler.tick(ServerLoginNetHandler.java:63) ~[?:?] {}
    at net.minecraft.network.NetworkManager.tick(NetworkManager.java:241) ~[?:?] {}
    at net.minecraft.network.NetworkSystem.tick(NetworkSystem.java:148) ~[?:?] {}
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:882) ~[?:?] {pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:800) ~[?:?] {pl:accesstransformer:B}
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:118) ~[?:?] {pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:646) [?:?] {pl:accesstransformer:B}
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_231] {}

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

-- Head --
Thread: Server thread
Stacktrace:
    at net.minecraft.entity.player.PlayerEntity.getName(PlayerEntity.java:1858)
    at net.minecraft.entity.Entity.toString(Entity.java:2361)
    at java.lang.String.valueOf(Unknown Source)
    at java.lang.StringBuilder.append(Unknown Source)
    at com.nenikitov.nemod.NeModEventHandler.onAttachCapabilities(NeModEventHandler.java:16)
    at net.minecraftforge.eventbus.ASMEventHandler_0_NeModEventHandler_onAttachCapabilities_AttachCapabilitiesEvent.invoke(.dynamic)
    at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80)
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258)
    at net.minecraftforge.event.ForgeEventFactory.gatherCapabilities(ForgeEventFactory.java:560)
    at net.minecraftforge.event.ForgeEventFactory.gatherCapabilities(ForgeEventFactory.java:554)
    at net.minecraftforge.common.capabilities.CapabilityProvider.gatherCapabilities(CapabilityProvider.java:48)
    at net.minecraftforge.common.capabilities.CapabilityProvider.gatherCapabilities(CapabilityProvider.java:44)
    at net.minecraft.entity.Entity.<init>(Entity.java:222)
    at net.minecraft.entity.LivingEntity.<init>(LivingEntity.java:192)
    at net.minecraft.entity.player.PlayerEntity.<init>(PlayerEntity.java:162)
    at net.minecraft.entity.player.ServerPlayerEntity.<init>(ServerPlayerEntity.java:163)
    at net.minecraft.server.management.PlayerList.createPlayerForUser(PlayerList.java:390)
    at net.minecraft.network.login.ServerLoginNetHandler.tryAcceptPlayer(ServerLoginNetHandler.java:119)
    at net.minecraft.network.login.ServerLoginNetHandler.tick(ServerLoginNetHandler.java:63)
    at net.minecraft.network.NetworkManager.tick(NetworkManager.java:241)

-- Ticking connection --
Details:
    Connection: net.minecraft.network.NetworkManager@c594c87
Stacktrace:
    at net.minecraft.network.NetworkSystem.tick(NetworkSystem.java:148)
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:882)
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:800)
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:118)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:646)
    at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
    Minecraft Version: 1.14.4
    Minecraft Version ID: 1.14.4
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_231, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 692512840 bytes (660 MB) / 2216165376 bytes (2113 MB) up to 3799515136 bytes (3623 MB)
    CPUs: 8
    JVM Flags: 1 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
    ModLauncher: 3.2.0+60+b86c1d4
    ModLauncher launch target: fmluserdevclient
    ModLauncher naming: mcp
    ModLauncher services: 
        /eventbus-1.0.0-service.jar eventbus PLUGINSERVICE 
        /forge-1.14.4-28.1.0_mapped_snapshot_20190719-1.14.3-launcher.jar object_holder_definalize PLUGINSERVICE 
        /forge-1.14.4-28.1.0_mapped_snapshot_20190719-1.14.3-launcher.jar runtime_enum_extender PLUGINSERVICE 
        /accesstransformers-1.0.0-shadowed.jar accesstransformer PLUGINSERVICE 
        /forge-1.14.4-28.1.0_mapped_snapshot_20190719-1.14.3-launcher.jar capability_inject_definalize PLUGINSERVICE 
        /forge-1.14.4-28.1.0_mapped_snapshot_20190719-1.14.3-launcher.jar runtimedistcleaner PLUGINSERVICE 
        /forge-1.14.4-28.1.0_mapped_snapshot_20190719-1.14.3-launcher.jar fml TRANSFORMATIONSERVICE 
    FML: 28.1
    Forge: net.minecraftforge:28.1.0
    FML Language Providers: 
        [email protected]
        minecraft@1
    Mod List: 
        forge-1.14.4-28.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar Forge {[email protected] DONE}
        main NE Mod {[email protected] DONE}
        client-extra.jar Minecraft {[email protected] DONE}
    Player Count: 0 / 8; []
    Data Packs: vanilla, mod:nemod, mod:forge
    Type: Integrated Server (map_client.txt)
    Is Modded: Definitely; Client brand changed to 'forge'

Any ideas what is happening?

Remove that println at the event handler. It's causing problems when the player object is converted to string.

Edited December 2, 2019 by Cerandior