I'm back from an old mod i've made for mc 1.11.2 : 

 

I've mostly restart from scratch and just rewrite all my class to create my "Bag".

The problem is ... i havn't any error but nothing happend, so i think io just miss something but can't find what is wrong.

 

Main.java

package com.kporal.mcplus;

import net.minecraft.client.renderer.block.model.ModelResourceLocation;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.init.Items;
import net.minecraft.init.SoundEvents;
import net.minecraft.inventory.EntityEquipmentSlot;
import net.minecraft.item.Item;
import net.minecraft.item.Item.ToolMaterial;
import net.minecraft.item.ItemArmor.ArmorMaterial;
import net.minecraft.item.ItemStack;
import net.minecraftforge.client.event.ModelRegistryEvent;
import net.minecraftforge.client.model.ModelLoader;
import net.minecraftforge.common.util.EnumHelper;
import net.minecraftforge.event.RegistryEvent;
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.FMLPreInitializationEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
import net.minecraftforge.fml.common.registry.GameRegistry;

@Mod( modid = Main.MODID, name = Main.NAME, version = Main.VERSION, acceptedMinecraftVersions = Main.MCVERSION )
public class Main {

	public static final String MODID = "mcplus";
	public static final String NAME = "MCPlus";
	public static final String VERSION = "1.0";
	public static final String MCVERSION = "[1.12.2]";
	
	public static final ArmorMaterial armorMCP = EnumHelper.addArmorMaterial( "armorMCP", MODID + ":dragoon", 1600, new int[] { 4, 8, 10, 4 }, 30, SoundEvents.ITEM_ARMOR_EQIIP_ELYTRA, 4 ).setRepairItem( new ItemStack( Items.EMERALD ));
	public static final ToolMaterial emeraldMCP = EnumHelper.addToolMaterial( "emeraldMCP", 4, 10000, 10.0F, 9.0F, 30 ).setRepairItem( new ItemStack( Items.EMERALD ));
	
	public static Item ehaxe, dragoonHelmet, dragoonChest, dragoonLegs, dragoonBoots, kitbag;
	
	@EventHandler
	public void preInit( FMLPreInitializationEvent event ) {
		ehaxe = new Ehaxe( emeraldMCP );
		dragoonHelmet = new DragoonArmor( armorMCP, EntityEquipmentSlot.HEAD, "dragoon_helmet" );
		dragoonChest = new DragoonArmor( armorMCP, EntityEquipmentSlot.CHEST, "dragoon_chest" );
		dragoonLegs = new DragoonArmor( armorMCP, EntityEquipmentSlot.LEGS, "dragoon_legs" );
		dragoonBoots = new DragoonArmor( armorMCP, EntityEquipmentSlot.FEET, "dragoon_boots" );
		kitbag = new Kitbag();
	}

	@EventHandler
	public void init( FMLInitializationEvent event ) {}
	
}

 

Kitbag.java

package com.kporal.mcplus;

import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.ActionResult;
import net.minecraft.util.EnumActionResult;
import net.minecraft.util.EnumHand;
import net.minecraft.world.World;
import net.minecraftforge.common.capabilities.ICapabilityProvider;

public class Kitbag extends Item {
	
	public Kitbag() {
		
		this.setRegistryName( "kitbag" );
		this.setTranslationKey( "kitbag" );
		this.setCreativeTab( CreativeTabs.TOOLS );
		this.setMaxStackSize( 1 );
		
	}

	public ActionResult<ItemStack> onItemRightClick( World w, EntityPlayer p, EnumHand e ) {
		//NBTTagCompound nbt = new NBTTagCompound();
		//inventory.deserializeNBT( nbt );

		return new ActionResult<ItemStack>( EnumActionResult.PASS, p.getHeldItemMainhand() );
	}

	public void onPlayerStoppedUsing( ItemStack stack, World worldIn, EntityLivingBase entityLiving, int timeLeft ) {
		//inventory.serializeNBT();
	}
	
	@Override
	public ICapabilityProvider initCapabilities( ItemStack item, NBTTagCompound nbt ) {
		if( item.getItem() == Main.kitbag ) {
			return new KitbagProvider();
		}
		return null;
	}
	
}

 

KitbagProvider.java

package com.kporal.mcplus;

import net.minecraft.nbt.NBTBase;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.EnumFacing;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.ICapabilityProvider;
import net.minecraftforge.common.capabilities.ICapabilitySerializable;
import net.minecraftforge.items.CapabilityItemHandler;
import net.minecraftforge.items.ItemStackHandler;

public class KitbagProvider implements ICapabilityProvider, ICapabilitySerializable<NBTTagCompound> {
	
	private final ItemStackHandler inventory;
	
	public KitbagProvider() {
		inventory = new ItemStackHandler( 54 );
	}
	
	@Override
	public NBTTagCompound serializeNBT() {
		return inventory.serializeNBT();
	}

	public void deserializeNBT( NBTTagCompound nbt ) {
		inventory.deserializeNBT( nbt );
	}

	@Override
	public boolean hasCapability( Capability<?> capability, EnumFacing facing ) {
		if( capability == CapabilityItemHandler.ITEM_HANDLER_CAPABILITY ) {
			return true;
		}
		return false;
	}

	@Override
	public <T> T getCapability( Capability<T> capability, EnumFacing facing ) {
		if( capability == CapabilityItemHandler.ITEM_HANDLER_CAPABILITY ) {
			return (T) inventory; 
		}
		return null;
	}
	
}

 

KitbagContainer.java

package com.kporal.mcplus;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.Container;
import net.minecraft.inventory.Slot;
import net.minecraftforge.items.IItemHandler;
import net.minecraftforge.items.SlotItemHandler;

public class KitbagContainer extends Container {

	public KitbagContainer( IItemHandler i, EntityPlayer p ) {
		
		int xPos = 8;
		int yPos = 18;
		int iid = 0;
	
		for( int y = 0; y < 6; ++y ) {
			for( int x = 0; x < 9; ++x ) {
				addSlotToContainer( new SlotItemHandler( i, iid, xPos + x * 18, yPos + y * 18 ));
				iid++;
			}
		}
		
		yPos = 140;
		
		for( int y = 0; y < 3; ++y ) {
			for( int x = 0; x < 9; ++x ) {
				addSlotToContainer( new Slot( p.inventory, x + y * 9 + 9, xPos + x * 18, yPos + y * 18 ));
			}
		}
		
		for( int x = 0; x < 9; ++x ) {
			addSlotToContainer( new Slot( p.inventory, x, xPos + x * 18, 198 ));
		}
		
	}
	
	@Override
	public boolean canInteractWith( EntityPlayer p ) {
		return true;
	}
	
}

 

KitbagGuiHandler.java

package com.kporal.mcplus;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.world.World;
import net.minecraftforge.fml.common.network.IGuiHandler;
import net.minecraftforge.items.CapabilityItemHandler;
import net.minecraftforge.items.IItemHandler;

public class KitbagGuiHandler implements IGuiHandler {

	@Override
	public Object getServerGuiElement(int ID, EntityPlayer p, World w, int x, int y, int z) {
		return new KitbagContainer( (IItemHandler) p.getHeldItemMainhand().getCapability( CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, null ), p );
	}

	@Override
	public Object getClientGuiElement(int ID, EntityPlayer p, World w, int x, int y, int z) {
		return new KitbagGui( (IItemHandler) p.getHeldItemMainhand().getCapability( CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, null ), p );
	}
	
}

 

KitbagGui.java

package com.kporal.mcplus;

import net.minecraft.client.gui.inventory.GuiContainer;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.items.IItemHandler;

public class KitbagGui extends GuiContainer {

	private IItemHandler i;
	
	public KitbagGui( IItemHandler i, EntityPlayer p ) {
		super( new KitbagContainer( i, p ));
		
		this.xSize = 175;
		this.ySize = 221;
		this.i = i;
	}

	@Override
	protected void drawGuiContainerBackgroundLayer(float partialTicks, int mouseX, int mouseY) {
		GlStateManager.color( 1.0F, 1.0F, 1.0F, 1.0F );
		this.mc.getTextureManager().bindTexture( new ResourceLocation( Main.MODID, "textures/gui/container/kitbag.png" ) );
		this.drawTexturedModalRect( this.guiLeft, this.guiTop, 0, 0, this.xSize, this.ySize );
	}
	
}

 

The game start without any error, my item is registered, i can't take it / craft it, absolutely no issue, but nothing happend on right click, so if any one see where i'm wrong and can tell me what's my error !

Update to a modern version of Minecraft. Anything under 1.14.4 isn't supported anymore because its too old.