Right clicking on block with custom gui crashes game

skylord11 · February 24, 2019

Hello everyone, I am very new to modding, and I have been following MCJty's modding tutorials and I haven't been able to figure out why it keeps crashing when I try to open my custom gui.

Here is the latest crash report:

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 2/24/19 5:20 PM
Description: Ticking player

java.lang.NullPointerException: Ticking player
	at net.minecraftforge.items.SlotItemHandler.getStack(SlotItemHandler.java:79)
	at net.minecraft.inventory.Container.detectAndSendChanges(Container.java:97)
	at net.minecraft.entity.player.EntityPlayerMP.onUpdate(EntityPlayerMP.java:365)
	at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2171)
	at net.minecraft.world.WorldServer.updateEntityWithOptionalForce(WorldServer.java:871)
	at net.minecraft.world.World.updateEntity(World.java:2130)
	at net.minecraft.world.WorldServer.tickPlayers(WorldServer.java:672)
	at net.minecraft.world.World.updateEntities(World.java:1906)
	at net.minecraft.world.WorldServer.updateEntities(WorldServer.java:643)
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:842)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:743)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:592)
	at java.lang.Thread.run(Thread.java:748)


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

-- Head --
Thread: Server thread
Stacktrace:
	at net.minecraftforge.items.SlotItemHandler.getStack(SlotItemHandler.java:79)
	at net.minecraft.inventory.Container.detectAndSendChanges(Container.java:97)
	at net.minecraft.entity.player.EntityPlayerMP.onUpdate(EntityPlayerMP.java:365)
	at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2171)
	at net.minecraft.world.WorldServer.updateEntityWithOptionalForce(WorldServer.java:871)
	at net.minecraft.world.World.updateEntity(World.java:2130)

-- Player being ticked --
Details:
	Entity Type: null (net.minecraft.entity.player.EntityPlayerMP)
	Entity ID: 1169
	Entity Name: Player12
	Entity's Exact location: -0.38, 64.00, 134.28
	Entity's Block location: World: (-1,64,134), Chunk: (at 15,4,6 in -1,8; contains blocks -16,0,128 to -1,255,143), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Entity's Momentum: 0.00, -0.08, 0.00
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at net.minecraft.world.WorldServer.tickPlayers(WorldServer.java:672)
	at net.minecraft.world.World.updateEntities(World.java:1906)
	at net.minecraft.world.WorldServer.updateEntities(WorldServer.java:643)

-- Affected level --
Details:
	Level name: Test World 4
	All players: 1 total; [EntityPlayerMP['Player12'/1169, l='Test World 4', x=-0.38, y=64.00, z=134.28]]
	Chunk stats: ServerChunkCache: 625 Drop: 0
	Level seed: 7944287069950578853
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (2,64,133), Chunk: (at 2,4,5 in 0,8; contains blocks 0,0,128 to 15,255,143), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 632 game time, 632 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 21371 (now: false), thunder time: 91626 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:842)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:743)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:592)
	at java.lang.Thread.run(Thread.java:748)

-- System Details --
Details:
	Minecraft Version: 1.12.2
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_191, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 582999192 bytes (555 MB) / 1038876672 bytes (990 MB) up to 1038876672 bytes (990 MB)
	JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	FML: MCP 9.42 Powered by Forge 14.23.5.2815 7 mods loaded, 7 mods active
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

	| State  | ID          | Version      | Source                           | Signature |
	|:------ |:----------- |:------------ |:-------------------------------- |:--------- |
	| LCHIJA | minecraft   | 1.12.2       | minecraft.jar                    | None      |
	| LCHIJA | mcp         | 9.42         | minecraft.jar                    | None      |
	| LCHIJA | FML         | 8.0.99.99    | forgeSrc-1.12.2-14.23.5.2815.jar | None      |
	| LCHIJA | forge       | 14.23.5.2815 | forgeSrc-1.12.2-14.23.5.2815.jar | None      |
	| LCHIJA | mymod       | 0.0.1        | bin                              | None      |
	| LCHIJA | jei         | 4.14.4.264   | jei_1.12.2-4.14.4.264.jar        | None      |
	| LCHIJA | theoneprobe | 1.4.28       | theoneprobe-1.12-1.4.28.jar      | None      |

	Loaded coremods (and transformers): 
	GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.

Here is my Block file:

package skylord11.mymod.furnace;


import net.minecraft.block.Block;
import net.minecraft.block.ITileEntityProvider;
import net.minecraft.block.material.Material;
import net.minecraft.block.properties.PropertyDirection;
import net.minecraft.block.state.BlockStateContainer;
import net.minecraft.block.state.IBlockState;
import net.minecraft.client.renderer.block.model.ModelResourceLocation;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.EnumHand;
import net.minecraft.util.ResourceLocation;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;
import net.minecraftforge.client.model.ModelLoader;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;
import skylord11.mymod.MyMod;

public class BlockFastFurnace extends Block implements ITileEntityProvider {
	
	public static final PropertyDirection FACING = PropertyDirection.create("facing");
	
	public static final ResourceLocation FAST_FURNACE = new ResourceLocation(MyMod.MODID, "fast_furnace");

	public BlockFastFurnace() {
		super(Material.IRON);
		// mymod:furnace
		setRegistryName(FAST_FURNACE);
		setUnlocalizedName(MyMod.MODID + ".fast_furnace");
		setHarvestLevel("pickaxe", 1);
		setCreativeTab(MyMod.creativeTab);
		
		setDefaultState(blockState.getBaseState().withProperty(FACING, EnumFacing.NORTH));
	}
	
	
	@Override
	public TileEntity createNewTileEntity(World worldIn, int meta) {
		return new TileFastFurnace();
	}
	
	
	@Override
	public boolean onBlockActivated(World world, BlockPos pos, IBlockState state, EntityPlayer player, EnumHand hand, EnumFacing facing, float hitX, float hitY, float hitZ) {
		// Only execute on the server
		if (world.isRemote) {
			return true;
		}
		TileEntity te = world.getTileEntity(pos);
		if (!(te instanceof TileFastFurnace)) {
			return false;
		}
		player.openGui(MyMod.instance, 0, world, pos.getX(), pos.getY(), pos.getZ());
		return true;
	}


	@SideOnly(Side.CLIENT)
	public void initModel() {
		ModelLoader.setCustomModelResourceLocation(Item.getItemFromBlock(this), 0, new ModelResourceLocation(getRegistryName(), "inventory"));
	}

	@Override
	public IBlockState getStateForPlacement(World worldIn, BlockPos pos, EnumFacing facing, float hitX, float hitY, float hitZ, int meta, EntityLivingBase placer) {
		 return this.getDefaultState().withProperty(FACING, EnumFacing.getDirectionFromEntityLiving(pos, placer));
				 
	}
	

	@Override
	protected BlockStateContainer createBlockState() {
		return new BlockStateContainer(this, FACING);
	}

	@Override
	public IBlockState getStateFromMeta(int meta) {
		return this.getDefaultState().withProperty(FACING, EnumFacing.getFront(meta & 7));
	}

	@Override
	public int getMetaFromState(IBlockState state) {
		return state.getValue(FACING).getIndex();
	}

	
	
	
	
	

}

Here is my Container file:

package skylord11.mymod.furnace;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.Container;
import net.minecraft.inventory.IInventory;
import net.minecraft.inventory.Slot;
import net.minecraft.item.ItemStack;
import net.minecraftforge.items.CapabilityItemHandler;
import net.minecraftforge.items.IItemHandler;
import net.minecraftforge.items.SlotItemHandler;

public class ContainerFastFurnace extends Container {
	
	private TileFastFurnace te;
	
	public ContainerFastFurnace(IInventory playerInventory, TileFastFurnace te) {
		this.te = te;
		
		addOwnSlots();
		addPlayerSlots(playerInventory);
	}
	
	private void addPlayerSlots(IInventory playerInventory) {
		//Slots for the main inventory
		for (int row = 0; row < 3; ++row) {
			for (int col = 0; col <3; ++col) {
				int x = 9 + col * 18;
				int y = row * 18 + 70;
				this.addSlotToContainer(new Slot(playerInventory, col + row * 9 + 18, x, y));
			}
		}
		
		//Slots for the hotbar
		for (int row = 0; row < 9; ++row) {
			int x = 9 + row * 18;
			int y = 58 + 70;
			this.addSlotToContainer(new Slot(playerInventory, row, x, y));
		}
	}
	
	private void addOwnSlots() {
		IItemHandler itemHandler = this.te.getCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, null);
		int x = 10;
		int y = 26;
		
		int slotIndex = 0;
		addSlotToContainer(new SlotItemHandler(itemHandler, slotIndex++, x, y)); x += 18;
		addSlotToContainer(new SlotItemHandler(itemHandler, slotIndex++, x, y)); x += 18;
		addSlotToContainer(new SlotItemHandler(itemHandler, slotIndex++, x, y));
		x = 118;
		addSlotToContainer(new SlotItemHandler(itemHandler, slotIndex++, x, y)); x += 18;
		addSlotToContainer(new SlotItemHandler(itemHandler, slotIndex++, x, y)); x += 18;
		addSlotToContainer(new SlotItemHandler(itemHandler, slotIndex++, x, y));		
		
		// Add our own slots
		
	}
	
	@Override
	public ItemStack transferStackInSlot(EntityPlayer playerIn, int index) {
		ItemStack itemstack = ItemStack.EMPTY;
		Slot slot = this.inventorySlots.get(index);
		
		if (slot != null && slot.getHasStack()) {
			ItemStack itemstack1 = slot.getStack();
			itemstack = itemstack1.copy();
			
			if (index < TileFastFurnace.SIZE) {
				if (!this.mergeItemStack(itemstack1, TileFastFurnace.SIZE, this.inventorySlots.size(), true)) {
					return ItemStack.EMPTY;
				}
			} else if (!this.mergeItemStack(itemstack1, 0, TileFastFurnace.SIZE, false)) {
				return ItemStack.EMPTY;
			}
			
			if (itemstack1.isEmpty()) {
				slot.putStack(ItemStack.EMPTY);
			} else {
				slot.onSlotChanged();
			}
			
		}
		
		return itemstack;
	}
	
	@Override
	public boolean canInteractWith(EntityPlayer playerIn) {
		return te.canInteractWith(playerIn);
	}
	
	


}

Here is my GUI file:

package skylord11.mymod.furnace;

import net.minecraft.client.gui.inventory.GuiContainer;
import net.minecraft.util.ResourceLocation;
import skylord11.mymod.MyMod;

public class GuiFastFurnace extends GuiContainer {
	
	public static final int WIDTH = 180;
	public static final int HEIGHT = 152;
	
	private static final ResourceLocation background = new ResourceLocation(MyMod.MODID, "gui/fast_furnace.png");
	
	public GuiFastFurnace(TileFastFurnace tileEntity, ContainerFastFurnace container) {
		super(container);
		
		xSize = WIDTH;
		ySize = HEIGHT;
	}
	
	@Override
	protected void drawGuiContainerBackgroundLayer(float partialTicks, int mouseX, int mouseY) {
		mc.getTextureManager().bindTexture(background);
		drawTexturedModalRect(guiLeft, guiTop, 0, 0, xSize, ySize);
	}
}

And here is my Tile file:

package skylord11.mymod.furnace;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.EnumFacing;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.items.CapabilityItemHandler;
import net.minecraftforge.items.ItemStackHandler;

public class TileFastFurnace extends TileEntity {
	
	public static final int SIZE = 3 + 3;
	
	private ItemStackHandler itemStackHandler = new ItemStackHandler(SIZE) {
		protected void onContentsChanged(int slot) {
			TileFastFurnace.this.markDirty();
		}
	};
	
	@Override
	public void readFromNBT(NBTTagCompound compound) {
		super.readFromNBT(compound);
		if (compound.hasKey("items")) {
			itemStackHandler.deserializeNBT((NBTTagCompound) compound.getTag("items"));
		}
	}
	
	@Override
	public NBTTagCompound writeToNBT(NBTTagCompound compound) {
		super.writeToNBT(compound);
		compound.setTag("items", itemStackHandler.serializeNBT());
		return compound;
	}
	
	public boolean canInteractWith(EntityPlayer playerIn) {
		// If we are too far away from this tile entity you cannot use it
		return !isInvalid() && playerIn.getDistanceSq(pos.add(0.5D, 0.5D, 0.5D)) <= 64D;
	}
	
	@Override
	public boolean hasCapability(Capability<?> capability, EnumFacing facing) {
		if (capability == CapabilityItemHandler.ITEM_HANDLER_CAPABILITY) {
			return true;
		}
		return super.hasCapability(capability, facing);
	}
	
	@Override
	public <T> T getCapability(Capability<T> capability, EnumFacing facing) {
		if (capability == CapabilityItemHandler.ITEM_HANDLER_CAPABILITY.cast(itemStackHandler)) {
			return CapabilityItemHandler.ITEM_HANDLER_CAPABILITY.cast(itemStackHandler);
		}
		return super.getCapability(capability, facing);
	}
	
	

}

Help would be appreciated!

LTNightshade · February 25, 2019

Show your Gui Handler

skylord11 · February 25, 2019

Here is my GUI handler:

package skylord11.mymod.proxy;

import javax.annotation.Nullable;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;
import net.minecraftforge.fml.common.network.IGuiHandler;
import skylord11.mymod.furnace.ContainerFastFurnace;
import skylord11.mymod.furnace.GuiFastFurnace;
import skylord11.mymod.furnace.TileFastFurnace;

public class GuiHandler implements IGuiHandler {
	
	@Nullable
	@Override
	public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
		BlockPos pos = new BlockPos(x, y, z);
		TileEntity te = world.getTileEntity(pos);
		if (te instanceof TileFastFurnace) {
			return new ContainerFastFurnace(player.inventory, (TileFastFurnace) te);
		}
		return null;
	}
	
	@Nullable
	@Override
	public Object getClientGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
		BlockPos pos = new BlockPos(x, y, z);
		TileEntity te = world.getTileEntity(pos);
		if (te instanceof TileFastFurnace) {
			TileFastFurnace containerTileEntity = (TileFastFurnace) te;
			return new GuiFastFurnace(containerTileEntity, new ContainerFastFurnace(player.inventory, containerTileEntity));
		}
		return null;
	}

}

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Right clicking on block with custom gui crashes game

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