[1.19.2] about "ForgeCapabilities.ITEM_HANDLER" preload a container whit custome loot

[perromercenary00]

good nights 

this one is a little hard to explains 

i finally managae to get working the briefcase i still working whit the block part but still 

back in the 1.8 the idea whit this briefcase was to give the player an initial inventory soo ineed to preload the briefcase whit items from code digginup in the code

i know minecrfas store inventories like nbt data usig a listtag named "Items" so i copy paste code from the chest container class to load things to mi briefcase but notice mi briefacase "ITEMS"  and the "ITEMS" in the GUI  dont match 
looks like to separate sets of nbt data 

both sets of "ITEMS" persist afther closing/reload the world soo is not an overwrite thing 

 

this are the methods i use read write the "ITEMS" in the item stack 

Spoiler

				
			    // ########## ########## ########## ##########
		    // @Override
		    public static NonNullList<ItemStack> read_items_from(ItemStack itemstack) {				
			        NonNullList<ItemStack> contained_items = NonNullList.withSize(9, ItemStack.EMPTY);// this.getContainerSize()				
			        if (itemstack.hasTag()) {
		            CompoundTag compoundtag = itemstack.getTag();
		            ListTag listtag = null;
		            int size = 0;				
			            if (compoundtag.contains("Items")) {
		                // ListTag listtag = new ListTag();
		                listtag = compoundtag.getList("Items", 10);
		                size = listtag.size();
		                // contained_items = NonNullList.withSize(size, ItemStack.EMPTY);				
			                for (int i = 0; i < listtag.size(); ++i) {
		                    CompoundTag itemstacktag = listtag.getCompound(i);
		                    int j = compoundtag.getByte("Slot") & 255;
		                    if (j >= 0 && j < contained_items.size()) {
		                        contained_items.set(j, ItemStack.of(itemstacktag));
		                    }
		                }
		            }
		        }
		        return contained_items;
		    }				
			    // ########## ########## ########## ##########
		    // @Override
		    public void write_items_to(ItemStack itemstack, NonNullList<ItemStack> contained_items) {				
			        CompoundTag compoundtag = null;				
			        if (itemstack.hasTag()) {
		            compoundtag = itemstack.getTag();
		        } else {
		            compoundtag = new CompoundTag();
		        }				
			        ListTag listtag = new ListTag();
		        int size = contained_items.size();				
			        for (int i = 0; i < size; ++i) {				
			            ItemStack itemslot = contained_items.get(i);
		            if (!itemslot.isEmpty()) {
		                CompoundTag itemcompound = new CompoundTag();
		                itemcompound.putByte("Slot", (byte) i);
		                itemslot.save(itemcompound);
		                listtag.add(itemcompound);
		            }
		        }
		        compoundtag.put("Items", listtag);
		        itemstack.setTag(compoundtag);
		    }				
			    // ########## ########## ########## ##########
		    // @Override
		    public void print(NonNullList<ItemStack> lista) {				
			        int count = 0;
		        for (ItemStack cosa : lista) {
		            System.out
		                    .println("[" + count + "] => " + cosa.getItem().getName(cosa).getString() + ", " + cosa.getCount());
		            count++;
		        }				
			    }
		 				
			 				
			

 

this is the code i use for the test 

Spoiler

				
			    // ########## ########## ########## ##########
		    @Override
		    public boolean onEntitySwing(ItemStack stack, LivingEntity le) {				
			        Level warudo = le.level;
		        System.out.println("onEntitySwing(" + warudo.isClientSide + ")");				
			        NonNullList<ItemStack> lista = this.read_items_from(stack);				
			        if( !warudo.isClientSide && le.isCrouching())
		        {
		             lista.set(0, new ItemStack( Items.POTATO , 3 ) );
		             lista.set(8, new ItemStack( Items.BAKED_POTATO , 3 ) );
		            this.write_items_to(stack, lista);
		        }				
			        print(lista);				
			        return true;
		    }				
			

 

###########################################################################

This getting too long 
i need to confirm if the capabilities system has its own database apart from the vainilla nbt thing 
and if its like that how doo i access tha data to put items in the briefcase ? 

 

class briefcase_item

Spoiler

				
			package mercblk.maletin;				
			import org.jetbrains.annotations.NotNull;
		import org.jetbrains.annotations.Nullable;				
			import io.netty.buffer.Unpooled;
		import mercblk.maletin.screen.menu9;
		import mercblk.util.Postate;
		import mercblk.util.Target;
		import net.minecraft.client.Minecraft;
		import net.minecraft.core.BlockPos;
		import net.minecraft.core.Direction;
		import net.minecraft.core.NonNullList;
		import net.minecraft.nbt.CompoundTag;
		import net.minecraft.nbt.ListTag;
		import net.minecraft.network.FriendlyByteBuf;
		import net.minecraft.network.chat.Component;
		import net.minecraft.server.level.ServerPlayer;
		import net.minecraft.world.Container;
		import net.minecraft.world.ContainerHelper;
		import net.minecraft.world.InteractionHand;
		import net.minecraft.world.InteractionResultHolder;
		import net.minecraft.world.MenuProvider;
		import net.minecraft.world.entity.Entity;
		import net.minecraft.world.entity.LivingEntity;
		import net.minecraft.world.entity.item.ItemEntity;
		import net.minecraft.world.entity.player.Inventory;
		import net.minecraft.world.entity.player.Player;
		import net.minecraft.world.inventory.AbstractContainerMenu;
		import net.minecraft.world.inventory.ContainerData;
		import net.minecraft.world.inventory.DispenserMenu;
		import net.minecraft.world.inventory.MenuType;
		import net.minecraft.world.item.Item;
		import net.minecraft.world.item.ItemStack;
		import net.minecraft.world.item.Items;
		import net.minecraft.world.level.Level;
		import net.minecraftforge.common.capabilities.Capability;
		import net.minecraftforge.common.util.LazyOptional;
		import net.minecraftforge.items.CapabilityItemHandler;
		import net.minecraftforge.items.IItemHandler;
		import net.minecraftforge.network.NetworkHooks;
		import net.minecraftforge.registries.RegistryObject;
		import net.minecraftforge.items.wrapper.InvWrapper;
		import net.minecraftforge.items.wrapper.ShulkerItemStackInvWrapper;
		import net.minecraftforge.common.capabilities.ForgeCapabilities;
		import net.minecraftforge.common.capabilities.ICapabilityProvider;				
			public class briefcase_item extends Item implements MenuProvider  { // MenuProvider implements MenuProvider, Container implements MenuProvider
		    
		    private int progress = 0;
		    private int maxProgress = 78;				
			    protected boolean remove = false;				
			    // ########## ########## ########## ##########
		    public briefcase_item(Properties propiedad) {
		        super(propiedad);
		    }				
			    // ########## ########## ########## ##########
		    public int getContainerSize() {
		        return 9;
		    }				
			    @Nullable
		    @Override
		    public ICapabilityProvider initCapabilities(ItemStack container, @Nullable CompoundTag nbt)
		    {
		        //BasketBlock basketBlock = ((BasketBlock) this.getBlock());				
			        return new item_c_provider(container);
		    }				
			    @Override
		    public @NotNull Component getDisplayName()
		    {
		        return Component.literal("Briefcase Item");
		        //return new TextComponent(((BasketBlock) this.getBlock()).basketSize.getName());
		    }    
		    
		    				
			    @Nullable
		    @Override
		    public AbstractContainerMenu createMenu(int containerId, @NotNull Inventory inventory, @NotNull Player player)
		    {
		        //return new BasketMenu(containerId, inventory, new FriendlyByteBuf(Unpooled.buffer()));
		        
		        //return new DispenserMenu( containerId, inventory );
		        return new menu9( containerId, inventory , new FriendlyByteBuf(Unpooled.buffer() ) );
		        //friendlyByteBuf -> friendlyByteBuf.writeItem(heldItem)
		        
		    }    
		    
		    @Override
		    public @NotNull InteractionResultHolder<ItemStack> use(@NotNull Level level, @NotNull Player pe, @NotNull InteractionHand interactionHand)
		    {
		        if (!level.isClientSide())
		        {
		            ItemStack heldItem = pe.getItemInHand(interactionHand);				
			            if (heldItem.getCapability(ForgeCapabilities.ITEM_HANDLER).isPresent())
		            {
		                //NetworkHooks.openGui((ServerPlayer) pe, this, friendlyByteBuf -> friendlyByteBuf.writeItem(heldItem));
		                //NetworkHooks.openGui((ServerPlayer) pe, this);
		                NetworkHooks.openScreen((ServerPlayer) pe, this);				
			                // container_ghost ghost = this.get_ghost(warudo, itemstack, pe);
		                // NetworkHooks.openScreen((ServerPlayer) pe, (this)itemstack );				
			                // pe.openMenu(ghost);
		                // NetworkHooks.openScreen((ServerPlayer) pe, ghost, pos);
		            }
		        }
		        return super.use(level, pe, interactionHand);
		    }				
			
		    // ########## ########## ########## ##########
		    // @Override
		    public static NonNullList<ItemStack> read_items_from(ItemStack itemstack) {				
			        NonNullList<ItemStack> contained_items = NonNullList.withSize(9, ItemStack.EMPTY);// this.getContainerSize()				
			        if (itemstack.hasTag()) {
		            CompoundTag compoundtag = itemstack.getTag();
		            ListTag listtag = null;
		            int size = 0;				
			            if (compoundtag.contains("Items")) {
		                // ListTag listtag = new ListTag();
		                listtag = compoundtag.getList("Items", 10);
		                size = listtag.size();
		                // contained_items = NonNullList.withSize(size, ItemStack.EMPTY);				
			                for (int i = 0; i < listtag.size(); ++i) {
		                    CompoundTag itemstacktag = listtag.getCompound(i);
		                    int j = compoundtag.getByte("Slot") & 255;
		                    if (j >= 0 && j < contained_items.size()) {
		                        contained_items.set(j, ItemStack.of(itemstacktag));
		                    }
		                }
		            }
		        }
		        return contained_items;
		    }				
			    // ########## ########## ########## ##########
		    // @Override
		    public void write_items_to(ItemStack itemstack, NonNullList<ItemStack> contained_items) {				
			        CompoundTag compoundtag = null;				
			        if (itemstack.hasTag()) {
		            compoundtag = itemstack.getTag();
		        } else {
		            compoundtag = new CompoundTag();
		        }				
			        ListTag listtag = new ListTag();
		        int size = contained_items.size();				
			        for (int i = 0; i < size; ++i) {				
			            ItemStack itemslot = contained_items.get(i);
		            if (!itemslot.isEmpty()) {
		                CompoundTag itemcompound = new CompoundTag();
		                itemcompound.putByte("Slot", (byte) i);
		                itemslot.save(itemcompound);
		                listtag.add(itemcompound);
		            }
		        }
		        compoundtag.put("Items", listtag);
		        itemstack.setTag(compoundtag);
		    }				
			    // ########## ########## ########## ##########
		    @Override
		    public boolean onEntitySwing(ItemStack stack, LivingEntity le) {				
			        Level warudo = le.level;
		        System.out.println("onEntitySwing(" + warudo.isClientSide + ")");				
			        NonNullList<ItemStack> lista = this.read_items_from(stack);				
			        if( !warudo.isClientSide && le.isCrouching())
		        {
		             lista.set(0, new ItemStack( Items.POTATO , 3 ) );
		             lista.set(8, new ItemStack( Items.BAKED_POTATO , 3 ) );
		            this.write_items_to(stack, lista);
		        }				
			        print(lista);				
			        return true;
		    }				
			    // ########## ########## ########## ##########
		    // @Override
		    public void print(NonNullList<ItemStack> lista) {				
			        int count = 0;
		        for (ItemStack cosa : lista) {
		            System.out
		                    .println("[" + count + "] => " + cosa.getItem().getName(cosa).getString() + ", " + cosa.getCount());
		            count++;
		        }				
			    }				
			
		    
		    @Override
		    public void inventoryTick(ItemStack stack, Level warudo, Entity en, int tick, boolean p_41408_) {
		        
		        Long time = warudo.getGameTime();
		        if( time % 40 == 0) {
		            //System.out.println("##inventoryTick## " + tick + warudo.isClientSide);
		            //print(this.items);            
		        }
		    }				
			    @Override
		    public void onCraftedBy(ItemStack p_41447_, Level p_41448_, Player p_41449_) {
		        System.out.println("##onCraftedBy##");
		        
		    }
		    
		    @Override
		    public boolean canFitInsideContainerItems() {
		        return false;
		     }
		    				
			    /**
		     * Called when the player Left Clicks (attacks) an entity. Processed before
		     * damage is done, if return value is true further processing is canceled and
		     * the entity is not attacked.
		     *
		     * @param stack  The Item being used
		     * @param player The player that is attacking
		     * @param entity The entity being attacked
		     * @return True to cancel the rest of the interaction.
		     */
		    @Override
		    public boolean onLeftClickEntity(ItemStack stack, Player player, Entity entity)
		    {
		        System.out.println("##onLeftClickEntity##");
		        return true;
		    }
		    
		    
		    // ########## ########## ########## ##########
		    // ########## ########## ########## ##########				
			    // ########## ########## ########## ##########
		    // ########## ########## ########## ##########
		    // ########## ########## ########## ##########
		}
		 				
			

 

class item_c_provider

Spoiler

				
			package mercblk.maletin;				
			
		import net.minecraft.core.Direction;
		import net.minecraft.nbt.CompoundTag;
		import net.minecraft.world.item.ItemStack;
		import net.minecraftforge.common.capabilities.Capability;
		import net.minecraftforge.common.capabilities.ForgeCapabilities;
		import net.minecraftforge.common.capabilities.ICapabilitySerializable;
		import net.minecraftforge.common.util.LazyOptional;
		import net.minecraftforge.items.CapabilityItemHandler;
		import net.minecraftforge.items.IItemHandler;
		import org.jetbrains.annotations.NotNull;
		import org.jetbrains.annotations.Nullable;				
			public class item_c_provider implements ICapabilitySerializable<CompoundTag>
		{
		    private final LazyOptional<IItemHandler> lazyItemHandler;				
			    public item_c_provider(ItemStack container)
		    {
		        lazyItemHandler = LazyOptional.of(() -> new item_handler(container));
		    }				
			    @NotNull
		    @Override
		    public <T> LazyOptional<T> getCapability(@NotNull Capability<T> capability, @Nullable Direction side)
		    {
		        //if (capability == CapabilityItemHandler.ITEM_HANDLER_CAPABILITY)
		        
		        if (capability == ForgeCapabilities.ITEM_HANDLER )        
		        {
		            return lazyItemHandler.cast();
		        }
		        else return LazyOptional.empty();
		    }				
			    // Farm out the serialization/deserialization to the capability
		    @Override
		    public CompoundTag serializeNBT()
		    {
		        return ((item_handler) lazyItemHandler.orElseThrow(() -> new RuntimeException("Capability not found during serialization"))).serializeNBT();
		    }				
			    @Override
		    public void deserializeNBT(CompoundTag nbt)
		    {
		        ((item_handler) lazyItemHandler.orElseThrow(() -> new RuntimeException("Capability not found during deserialization"))).deserializeNBT(nbt);
		    }
		}				
			

 

class item_handler

Spoiler

				
			package mercblk.maletin;				
			
		import net.minecraft.core.NonNullList;
		import net.minecraft.nbt.CompoundTag;
		import net.minecraft.nbt.ListTag;
		import net.minecraft.world.item.ItemStack;
		import net.minecraftforge.items.ItemStackHandler;
		import org.jetbrains.annotations.NotNull;				
			public class item_handler extends ItemStackHandler
		{
		    //private final BasketBlock.BasketSize basketSize;
		    
		    ItemStack container = null;
		    				
			    public item_handler(ItemStack container)
		    {
		        super(9);
		        this.container  = container;
		    }				
			    @Override
		    public int getSlotLimit(int slot)
		    {
		        return 9;
		    }				
			    @Override
		    public boolean isItemValid(int slot, @NotNull ItemStack stack)
		    {
		        if ( stack == null ||  stack.isEmpty() ) //|| stack.getItem() instanceof BasketBlockItem
		        {
		            return false;
		        }
		        else
		        {
		            return super.isItemValid(slot, stack);
		        }
		    }
		    
		       
		    @Override
		    public void setStackInSlot(int slot, @NotNull ItemStack stack)
		    {
		        
		        System.out.println("setStackInSlot(" + slot + ")");
		        validateSlotIndex(slot);
		        this.stacks.set(slot, stack);
		        onContentsChanged(slot);
		        
		        if(this.container != null) {
		        //write_item_to_slot(this.container, slot, stack);
		        }
		    }   
		    
		    
		    // ########## ########## ########## ##########
		    // @Override
		    public static NonNullList<ItemStack> read_items_from(ItemStack itemstack) {				
			        NonNullList<ItemStack> contained_items = NonNullList.withSize(9, ItemStack.EMPTY);// this.getContainerSize()				
			        if (itemstack.hasTag()) {
		            CompoundTag compoundtag = itemstack.getTag();
		            ListTag listtag = null;
		            int size = 0;				
			            if (compoundtag.contains("Items")) {
		                // ListTag listtag = new ListTag();
		                listtag = compoundtag.getList("Items", 10);
		                size = listtag.size();
		                // contained_items = NonNullList.withSize(size, ItemStack.EMPTY);				
			                for (int i = 0; i < listtag.size(); ++i) {
		                    CompoundTag itemstacktag = listtag.getCompound(i);
		                    int j = compoundtag.getByte("Slot") & 255;
		                    if (j >= 0 && j < contained_items.size()) {
		                        contained_items.set(j, ItemStack.of(itemstacktag));
		                    }
		                }
		            }
		        }
		        return contained_items;
		    }				
			    // ########## ########## ########## ##########
		    // @Override
		    public void write_item_to_slot(ItemStack container, int slot, @NotNull ItemStack stack) {
		        //,  NonNullList<ItemStack> contained_items				
			        CompoundTag compoundtag = null;				
			        if (container.hasTag()) {
		            compoundtag = container.getTag();
		        } else {
		            compoundtag = new CompoundTag();
		        }				
			        ListTag listtag = null;
		        if (compoundtag.contains("Items")) {
		            listtag = compoundtag.getList("Items", 10);
		        }else {
		            listtag = new ListTag();
		        }
		        
		        CompoundTag itemstacktag = null;
		        
		        if(slot < listtag.size() ) {
		            itemstacktag = listtag.getCompound(slot);
		        }
		        else {
		            itemstacktag = new CompoundTag();
		        }        
		        
		        itemstacktag.putByte("Slot", (byte) slot);
		        stack.save(itemstacktag);
		        listtag.add(itemstacktag); //aqui tengi una duda, se sobreescrive o crea otra ??				
			        compoundtag.put("Items", listtag);
		        container.setTag(compoundtag);
		    }
		    
		}				
			 				
			

 

class menu9

Spoiler

				
			package mercblk.maletin.screen;				
			import org.jetbrains.annotations.NotNull;				
			import mercblk.maletin.briefcase_item;
		import mercblk.maletin.maletin_init;
		import net.minecraft.core.NonNullList;
		import net.minecraft.nbt.CompoundTag;
		import net.minecraft.nbt.ListTag;
		import net.minecraft.network.FriendlyByteBuf;
		import net.minecraft.world.InteractionHand;
		import net.minecraft.world.entity.player.Inventory;
		import net.minecraft.world.entity.player.Player;
		import net.minecraft.world.inventory.*;
		import net.minecraft.world.item.ItemStack;
		import net.minecraft.world.level.Level;
		import net.minecraft.world.level.block.entity.BlockEntity;
		import net.minecraftforge.common.capabilities.ForgeCapabilities;
		import net.minecraftforge.items.IItemHandler;
		import net.minecraftforge.items.ItemStackHandler;
		import net.minecraftforge.items.SlotItemHandler;
		import net.minecraft.world.Container;
		import net.minecraft.world.SimpleContainer;
		import net.minecraft.world.entity.player.Inventory;
		import net.minecraft.world.entity.player.Player;
		import net.minecraft.world.item.ItemStack;				
			
		public class menu9 extends AbstractContainerMenu {
		    public static mercblk.maletin.briefcase_item container_item = null;
		    private final Level level;
		    private final ContainerData data;
		    
		    public menu9(int id, Inventory inv, FriendlyByteBuf extraData) {
		        this(id, inv, new SimpleContainerData(9));
		    }				
			
		    @SuppressWarnings("removal")
		    public menu9(int id, Inventory inv, ContainerData data) {//
		        super(maletin_init.MENU9.get(), id);
		        //checkContainerSize(container_item, 9);
		        
		        this.level = inv.player.level;
		        this.data = data;				
			        addPlayerInventory(inv);
		        addPlayerHotbar(inv);				
			        Player pe = inv.player;
		        ItemStack itemstack = null; 
		        
		        InteractionHand[] manos = {InteractionHand.OFF_HAND, InteractionHand.MAIN_HAND};                
		        for( InteractionHand mano : manos) {
		            if( pe.getItemInHand(mano).getItem() instanceof briefcase_item  ) {
		                itemstack = pe.getItemInHand(mano);
		            }
		        }
		        
		        
		        itemstack.getCapability(ForgeCapabilities.ITEM_HANDLER).ifPresent(handler00 -> {
		            //this.addSlot(new SlotItemHandler(handler, 0, 12, 15));
		            //this.addSlot(new SlotItemHandler(handler, 1, 86, 15));
		            //this.addSlot(new SlotItemHandler(handler, 2, 86, 60));
		            
		            System.out.println( "\nhandler00.getSlots(" + handler00.getSlots() + ");\n" );
		            
		            for(int i = 0; i < 3; ++i) {
		                for(int j = 0; j < 3; ++j) {
		                   this.addSlot(new SlotItemHandler(handler00, j + i * 3, 62 + j * 18, 17 + i * 18));
		                }
		             }
		         
		        });
		        				
			        addDataSlots(data);
		    }				
			    public boolean isCrafting() {
		        return data.get(0) > 0;
		    }				
			    public int getScaledProgress() {
		        int progress = this.data.get(0);
		        int maxProgress = this.data.get(1);  // Max Progress
		        int progressArrowSize = 26; // This is the height in pixels of your arrow				
			        return maxProgress != 0 && progress != 0 ? progress * progressArrowSize / maxProgress : 0;
		    }				
			    // CREDIT GOES TO: diesieben07 | https://github.com/diesieben07/SevenCommons
		    // must assign a slot number to each of the slots used by the GUI.
		    // For this container, we can see both the tile inventory's slots as well as the player inventory slots and the hotbar.
		    // Each time we add a Slot to the container, it automatically increases the slotIndex, which means
		    //  0 - 8 = hotbar slots (which will map to the InventoryPlayer slot numbers 0 - 
		    //  9 - 35 = player inventory slots (which map to the InventoryPlayer slot numbers 9 - 35)
		    //  36 - 44 = TileInventory slots, which map to our TileEntity slot numbers 0 - 
		    private static final int HOTBAR_SLOT_COUNT = 9;
		    private static final int PLAYER_INVENTORY_ROW_COUNT = 3;
		    private static final int PLAYER_INVENTORY_COLUMN_COUNT = 9;
		    private static final int PLAYER_INVENTORY_SLOT_COUNT = PLAYER_INVENTORY_COLUMN_COUNT * PLAYER_INVENTORY_ROW_COUNT;
		    private static final int VANILLA_SLOT_COUNT = HOTBAR_SLOT_COUNT + PLAYER_INVENTORY_SLOT_COUNT;
		    private static final int VANILLA_FIRST_SLOT_INDEX = 0;
		    private static final int TE_INVENTORY_FIRST_SLOT_INDEX = VANILLA_FIRST_SLOT_INDEX + VANILLA_SLOT_COUNT;				
			    // THIS YOU HAVE TO DEFINE!
		    private static final int TE_INVENTORY_SLOT_COUNT = 9;  // must be the number of slots you have!				
			    @Override
		    public boolean stillValid(Player player) {
		        return true;
		    }				
			    private void addPlayerInventory(Inventory playerInventory) {
		        for (int i = 0; i < 3; ++i) {
		            for (int l = 0; l < 9; ++l) {
		                this.addSlot(new Slot(playerInventory, l + i * 9 + 9, 8 + l * 18, 86 + i * 18));
		            }
		        }
		    }				
			    private void addPlayerHotbar(Inventory playerInventory) {
		        for (int i = 0; i < 9; ++i) {
		            this.addSlot(new Slot(playerInventory, i, 8 + i * 18, 144));
		        }
		    }
		    
		//what this does 
		    @Override
		    public ItemStack quickMoveStack(Player p_38941_, int p_38942_) {
		        // TODO Auto-generated method stub
		        return null;
		    }    
		    				
			
		}
		 				
			

 

 

thanks from your time

[perromercenary00]

this picture shows the problem 
while the gui says the item has 7 redstone ingots in the capability
the print method says i have two potatoes in slots one and eight  in the itemstack nbt 

if i close minecraft and open again the world i still havethe 7 ingots in the gui and the two potatoes in the code 

 

[ChampionAsh5357]

That most likely means that the data on the server is not being synced to the client properly. You'll probably need to override #getShareTag to send the capability data. Additionally, you probably should make sure the stack doesn't have the items stored in two different locations.