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[1.7.2]Simple 1-slot chest/Container returns ClassCastException


n1ghtk1n9

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I've just started learning modding for Minecraft(have been for 3 days). I'd say I'm close to intermediate when it comes to Java(been programming w/ it for about 8 months constantly). I have been trying to create, basically, a chest, from an outdated tutorial(which also didn't really explain the code). I got all of the error part out of the code(as in there is no red squiggle under the code), and when I click on the block to open it, it quickly displays the GUI, then the game immediately crashes.

 

Sorry if this seems like a "noob" question or anything, I am pretty beginner at this

 

EDIT: Can a mod help me out with this format? It's messing up for me

 

 

Stack trace:

 

 

 

---- Minecraft Crash Report ----

// I feel sad now :(

 

 

Time: 2/27/14 6:56 PM

Description: Ticking memory connection

 

 

java.lang.ClassCastException: tutorial.basic.BasicGui cannot be cast to net.minecraft.inventory.Container

  at cpw.mods.fml.common.network.NetworkRegistry.getRemoteGuiContainer(NetworkRegistry.java:241)

  at cpw.mods.fml.common.network.internal.FMLNetworkHandler.openGui(FMLNetworkHandler.java:75)

  at net.minecraft.entity.player.EntityPlayer.openGui(EntityPlayer.java:2476)

  at tutorial.basic.BasicContainerBlock.onBlockActivated(BasicContainerBlock.java:40)

  at net.minecraft.server.management.ItemInWorldManager.activateBlockOrUseItem(ItemInWorldManager.java:411)

  at net.minecraft.network.NetHandlerPlayServer.processPlayerBlockPlacement(NetHandlerPlayServer.java:596)

  at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.processPacket(C08PacketPlayerBlockPlacement.java:74)

  at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.processPacket(C08PacketPlayerBlockPlacement.java:122)

  at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:242)

  at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:190)

  at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:762)

  at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:650)

  at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:120)

  at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:528)

  at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:787)

 

 

 

 

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

---------------------------------------------------------------------------------------

 

 

-- Head --

Stacktrace:

  at cpw.mods.fml.common.network.NetworkRegistry.getRemoteGuiContainer(NetworkRegistry.java:241)

  at cpw.mods.fml.common.network.internal.FMLNetworkHandler.openGui(FMLNetworkHandler.java:75)

  at net.minecraft.entity.player.EntityPlayer.openGui(EntityPlayer.java:2476)

  at tutorial.basic.BasicContainerBlock.onBlockActivated(BasicContainerBlock.java:40)

  at net.minecraft.server.management.ItemInWorldManager.activateBlockOrUseItem(ItemInWorldManager.java:411)

  at net.minecraft.network.NetHandlerPlayServer.processPlayerBlockPlacement(NetHandlerPlayServer.java:596)

  at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.processPacket(C08PacketPlayerBlockPlacement.java:74)

  at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.processPacket(C08PacketPlayerBlockPlacement.java:122)

  at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:242)

 

 

-- Ticking connection --

Details:

  Connection: net.minecraft.network.NetworkManager@3f54e121

Stacktrace:

  at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:190)

  at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:762)

  at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:650)

  at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:120)

  at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:528)

  at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:787)

 

 

-- System Details --

Details:

  Minecraft Version: 1.7.2

  Operating System: Windows 7 (amd64) version 6.1

  Java Version: 1.7.0_21, Oracle Corporation

  Java VM Version: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation

  Memory: 927474744 bytes (884 MB) / 1038876672 bytes (990 MB) up to 1038876672 bytes (990 MB)

  JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M

  AABB Pool Size: 3621 (202776 bytes; 0 MB) allocated, 3370 (188720 bytes; 0 MB) used

  IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0

  FML: MCP v9.01-pre FML v7.2.116.1024 Minecraft Forge 10.12.0.1024 7 mods loaded, 7 mods active

  mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

  FML{7.2.116.1024} [Forge Mod Loader] (forgeSrc-1.7.2-10.12.0.1024.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

  Forge{10.12.0.1024} [Minecraft Forge] (forgeSrc-1.7.2-10.12.0.1024.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

  examplemod{1.0} [Example Mod] (bin) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

  Animilia{0.0.0} [Animilia] (bin) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

  Basic{0.0.1} [basic] (bin) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

  GenericModID{0.0.0} [Generic] (bin) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

  Profiler Position: N/A (disabled)

  Vec3 Pool Size: 545 (30520 bytes; 0 MB) allocated, 422 (23632 bytes; 0 MB) used

  Player Count: 1 / 8; [EntityPlayerMP['Player584'/170, l='Test', x=-382.49, y=4.00, z=44.73]]

  Type: Integrated Server (map_client.txt)

  Is Modded: Definitely; Client brand changed to 'fml,forge'

 

 

 

My code:

 

Main Class

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.item.Item;
import net.minecraft.item.ItemBlock;
import cpw.mods.fml.common.Mod;
import cpw.mods.fml.common.Mod.EventHandler;
import cpw.mods.fml.common.Mod.Instance;
import cpw.mods.fml.common.SidedProxy;
import cpw.mods.fml.common.event.FMLInitializationEvent;
import cpw.mods.fml.common.event.FMLPostInitializationEvent;
import cpw.mods.fml.common.event.FMLPreInitializationEvent;
import cpw.mods.fml.common.network.NetworkRegistry;
import cpw.mods.fml.common.registry.GameRegistry;


@Mod(modid="Basic", name="Basic", version="0.0.1")
public class Basic {
   public static Block basicOre = new BasicBlock(Material.ground);
   public static Item basicDust = new BasicDust();
   public static Block basicContainer = new BasicContainerBlock(Material.rock);
   
   @Instance(value = "Basic")
   public static Basic instance;
   
   @SidedProxy(clientSide = "tutorial.basic.ClientProxy", serverSide = "tutorial.basic.CommonProxy")
   public static CommonProxy proxy;
   
   @EventHandler
   public void preInit(FMLPreInitializationEvent event) {
      proxy.registerRenderers();
      
      GameRegistry.registerBlock(basicOre, "basicOre");
      GameRegistry.registerItem(basicDust, "basicDust");
      
      GameRegistry.registerBlock(basicContainer, ItemBlock.class, "basicContainer");
      GameRegistry.registerTileEntity(BasicTileEntity.class, "basicContainer");
      NetworkRegistry.INSTANCE.registerGuiHandler(this, new BasicGuiHandler());
   }
   
   @EventHandler
   public void load(FMLInitializationEvent event) {
      
   }
   
   @EventHandler
   public void postInit(FMLPostInitializationEvent event) {
      
   }
}

 

BasicContainer

 



import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.inventory.Container;
import net.minecraft.inventory.Slot;
import net.minecraft.item.ItemStack;


public class BasicContainer extends Container {
   protected BasicTileEntity tileEntity;
   
   public BasicContainer(InventoryPlayer inventoryPlayer, BasicTileEntity te) {
      tileEntity = te;
      
      for(int i = 0; i < 3; i++) {
         for(int j = 0; j < 3; j++) {
            addSlotToContainer(new Slot(tileEntity, j + i * 3, 62 + j * 18, 17 + i * 18));
         }
      }
      
      bindPlayerInventory(inventoryPlayer);
   }
   
   @Override
   public boolean canInteractWith(EntityPlayer var1) {
      return false;
   }
   
   protected void bindPlayerInventory(InventoryPlayer inventoryPlayer) {
      for(int i = 0; i < 3; i++) {
         for(int j = 0; j < 9; j++) {
            addSlotToContainer(new Slot(inventoryPlayer, j + i * 9 + 9, 8 + j * 18, 84 + i * 18));
         }
      }
      
      for(int i = 0; i < 9; i++) {
         addSlotToContainer(new Slot(inventoryPlayer, i, 8 + i * 18, 142));
      }
   }
   
   //For shift-clicking, without this, it would cause massive errors
   @Override
   public ItemStack transferStackInSlot(EntityPlayer player, int slot) {
      ItemStack stack = null;
      Slot slotObject = (Slot) inventorySlots.get(slot);
      
      //null checks and checks if the item can be stacked (maxStackSize > 1)
      if(slotObject != null && slotObject.getHasStack()) {
         ItemStack stackInSlot = slotObject.getStack();
         stack = stackInSlot.copy();
         
          //Merges the item into player inventory since its in the tileEntity
         if(slot < 9) {
            if(!this.mergeItemStack(stackInSlot, 0, 35, true)) {
               return null;
               
            }
            
         //places it into the tileEntity is possible since its in the player inventory   
         } else if(!this.mergeItemStack(stackInSlot, 0, 9, false)) {
            return null;
            
         }
         
         if(stackInSlot.stackSize == 0) {
            slotObject.putStack(null);
            
         } else {
            slotObject.onSlotChanged();
            
         }
         
         if(stackInSlot.stackSize == stack.stackSize) {
            return null;
         }
         
         slotObject.onPickupFromSlot(player, stackInSlot);
      }
      
      return stack;
   }
}

BasicContainerBlock

 

import java.util.Random;


import net.minecraft.block.Block;
import net.minecraft.block.BlockContainer;
import net.minecraft.block.material.Material;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.world.World;


public class BasicContainerBlock extends BlockContainer {


   protected BasicContainerBlock(Material material) {
      super(material);
      setHardness(2.0f);
      setResistance(5.0f);
      setBlockName("basicContainer");
      setCreativeTab(CreativeTabs.tabDecorations);
      
   }


   @Override
   public TileEntity createNewTileEntity(World var1, int var2) {
      return new BasicTileEntity();
   }
   
   @Override
   public boolean onBlockActivated(World world, int x, int y, int z, EntityPlayer player, int metadata, float what, float these, float are) {
      TileEntity tileEntity = world.getTileEntity(x, y, z);
      if(tileEntity == null || player.isSneaking()) {
         return false;
      }
      
      player.openGui(Basic.instance, 0, world, x, y, z);
      return true;
   }
   
   @Override
   public void breakBlock(World world, int x, int y, int z, Block block, int par6) {
      dropItems(world, x, y, z);
      super.breakBlock(world, x, y, z, block, par6);
   }
   
   private void dropItems(World world, int x, int y, int z) {
      Random rand = new Random();
      
      TileEntity tileEntity = world.getTileEntity(x, y, z);
      if(!(tileEntity instanceof IInventory)) {
         return;
      }
      
      IInventory inventory = (IInventory) tileEntity;
      
      for(int i = 0; i < inventory.getSizeInventory(); i++) {
         ItemStack item = inventory.getStackInSlot(i);
         
         if(item != null && item.stackSize > 0) {
            float rx = rand.nextFloat() * 0.8f + 0.1f;
            float ry = rand.nextFloat() * 0.8f + 0.1f;
            float rz = rand.nextFloat() * 0.8f + 0.1f;
            
            EntityItem entityItem = new EntityItem(world, x + rx, y + ry, z + rz, new ItemStack(item.getItem(), item.stackSize, item.getItemDamage()));
            
            if(item.hasTagCompound()) {
               entityItem.getEntityItem().setTagCompound((NBTTagCompound) item.getTagCompound().copy());
               
            }
            
            float factor = 0.05f;
            entityItem.motionX = rand.nextGaussian() * factor;
            entityItem.motionY = rand.nextGaussian() * factor + 0.2F;
                entityItem.motionZ = rand.nextGaussian() * factor;
                world.spawnEntityInWorld(entityItem);
                item.stackSize = 0;
                
          }
      }
   }
}

BasicGui

 

import org.lwjgl.opengl.GL11;


import net.minecraft.client.gui.FontRenderer;
import net.minecraft.client.gui.inventory.GuiContainer;
import net.minecraft.client.renderer.texture.ITextureObject;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.util.ResourceLocation;
import net.minecraft.util.StatCollector;


public class BasicGui extends GuiContainer {
   
   public BasicGui(InventoryPlayer inventoryPlayer, BasicTileEntity tileEntity) {
      super(new BasicContainer(inventoryPlayer, tileEntity));
   }
   
   @Override
   protected void drawGuiContainerForegroundLayer(int param1, int param2) { //Draw text and stuff here
      fontRendererObj.drawString("Basic", 8, 6, 4210752); //params are string, x, y, color
      fontRendererObj.drawString(StatCollector.translateToLocal("container.inventory"), 8, ySize - 96 + 2, 4210752); //draws "Inventory
      
   }


   @Override
   protected void drawGuiContainerBackgroundLayer(float par1, int par2, int par3) { 
      GL11.glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
      this.mc.renderEngine.bindTexture(new ResourceLocation("basic:textures/gui/basicGui.png"));
      int x = (width - xSize) /2;
      int y = (height - ySize) /2;
      this.drawTexturedModalRect(x, y, 0, 0, xSize, ySize);
   }
}

BasicGuiHandler

 

[/size]



import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.world.World;
import cpw.mods.fml.common.network.IGuiHandler;


public class BasicGuiHandler implements IGuiHandler {


   @Override
   public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
      TileEntity tileEntity = world.getTileEntity(x, y, z);
      if(tileEntity instanceof BasicTileEntity) {
         return new BasicGui(player.inventory, (BasicTileEntity) tileEntity);
      }
      
      return null;
   }


   @Override
   public Object getClientGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
      TileEntity tileEntity = world.getTileEntity(x, y, z);
      if(tileEntity instanceof BasicTileEntity) {
         return new BasicGui(player.inventory, (BasicTileEntity) tileEntity);
         
      }
      return null;
   }
}

[/size]

 

 

BasicTileEntity

 

 

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.nbt.NBTTagList;
import net.minecraft.tileentity.TileEntity;


public class BasicTileEntity extends TileEntity implements IInventory{
   public int customField;
   private ItemStack[] inv;
   
   public BasicTileEntity() {
      inv = new ItemStack[9];
   }
   
   @Override
   public void writeToNBT(NBTTagCompound tagCompound) {
      super.writeToNBT(tagCompound);
      
      NBTTagList itemList = new NBTTagList();
      for(int i = 0; i < inv.length; i++) {
         ItemStack stack = inv[i];
         if(stack != null) {
            NBTTagCompound tag = new NBTTagCompound();
            tag.setByte("Slot", (byte) i);
            stack.writeToNBT(tag);
            itemList.appendTag(tag);
         }
      }
      tagCompound.setTag("Inventory", itemList);
   }
   
   @Override
   public void readFromNBT(NBTTagCompound tagCompound) {
      super.readFromNBT(tagCompound);
      
      NBTTagList tagList = tagCompound.getTagList("Inventory", 0);
      for(int i = 0; i < tagList.tagCount(); i++) {
         NBTTagCompound tag = tagList.getCompoundTagAt(i);
         byte slot = tag.getByte("Slot");
         if(slot >= 0 && slot < inv.length) {
            inv[slot] = ItemStack.loadItemStackFromNBT(tag);
         }
      }
   }


   @Override
   public int getSizeInventory() {
      return inv.length;
   }


   @Override
   public ItemStack getStackInSlot(int slot) {
      return inv[slot];
   }


   @Override
   public ItemStack decrStackSize(int slot, int amt) {
      ItemStack stack = getStackInSlot(slot);
      if(stack != null) {
         if(stack.stackSize <= amt) {
            setInventorySlotContents(slot, null);
         } else {
            stack = stack.splitStack(amt);
            if(stack.stackSize == 0) {
               setInventorySlotContents(slot, null);
               
            }
         }
      }
      return stack;
   }


   @Override
   public ItemStack getStackInSlotOnClosing(int slot) {
      ItemStack stack = getStackInSlot(slot);
      if(stack != null) {
         setInventorySlotContents(slot, null);
         
      }
      
      return stack;
   }


   @Override
   public void setInventorySlotContents(int slot, ItemStack stack) {
      inv[slot] = stack;
      if(stack != null && stack.stackSize > getInventoryStackLimit()) {
         stack.stackSize = getInventoryStackLimit();
         
      }
   }


   @Override
   public String getInventoryName() {
      return "basic.BasicTileEntity";
   }


   @Override
   public boolean hasCustomInventoryName() {
      return false;
   }


   @Override
   public int getInventoryStackLimit() {
      return 64;
   }


   @Override
   public boolean isUseableByPlayer(EntityPlayer player) {
      return worldObj.getTileEntity(xCoord, yCoord, zCoord) == this && player.getDistanceSq(xCoord + 0.5, yCoord + 0.5, zCoord + 0.5) < 64;
   }


   @Override
   public void openInventory() {
      
   }


   @Override
   public void closeInventory() {
      
   }


   @Override
   public boolean isItemValidForSlot(int var1, ItemStack var2) {
      return false;
   }
}

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In your GuiHandler:

 @Override
   public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
      TileEntity tileEntity = world.getTileEntity(x, y, z);
      if(tileEntity instanceof BasicTileEntity) {
         return new BasicGui(player.inventory, (BasicTileEntity) tileEntity);
      }
      
      return null;
   }

You're returning a gui on the server side, but you need to return a container class.

Don't PM me with questions. They will be ignored! Make a thread on the appropriate board for support.

 

1.12 -> 1.13 primer by williewillus.

 

1.7.10 and older versions of Minecraft are no longer supported due to it's age! Update to the latest version for support.

 

http://www.howoldisminecraft1710.today/

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In your GuiHandler:

 @Override
   public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
      TileEntity tileEntity = world.getTileEntity(x, y, z);
      if(tileEntity instanceof BasicTileEntity) {
         return new BasicGui(player.inventory, (BasicTileEntity) tileEntity);
      }
      
      return null;
   }

You're returning a gui on the server side, but you need to return a container class.

 

So should I do something like

 

return new BasicContainer(player.inventory, (BasicTileEntity) tileEntity);

 

in the getServerGuiElemet method?

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Yeah, that should work.

 

Do I replace the

return new BasicGui(player.inventory, (BasicTileEntity) tileEntity) 

 

with the thing I suggested? because I can only return one or the other

 

Also, if I wanted to say create a backpack, how on right click with the backpack item, it would open a chest inventory and store the contents in the item, would I only need a IGuiHandler and a GuiContainer, or those 2 and a container?

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Yeah, that should work.

 

Do I replace the

return new BasicGui(player.inventory, (BasicTileEntity) tileEntity) 

 

with the thing I suggested? because I can only return one or the other

 

Also, if I wanted to say create a backpack, how on right click with the backpack item, it would open a chest inventory and store the contents in the item, would I only need a IGuiHandler and a GuiContainer, or those 2 and a container?

That's the line you need to replace.

 

I haven't done anything with backpack type stuff, but i know what you need:

Something with IInventory

A GuiContainer class

A Container class

A GuiHandler (you already got one)

Don't PM me with questions. They will be ignored! Make a thread on the appropriate board for support.

 

1.12 -> 1.13 primer by williewillus.

 

1.7.10 and older versions of Minecraft are no longer supported due to it's age! Update to the latest version for support.

 

http://www.howoldisminecraft1710.today/

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Share on other sites

Yeah, that should work.

 

Do I replace the

return new BasicGui(player.inventory, (BasicTileEntity) tileEntity) 

 

with the thing I suggested? because I can only return one or the other

 

Also, if I wanted to say create a backpack, how on right click with the backpack item, it would open a chest inventory and store the contents in the item, would I only need a IGuiHandler and a GuiContainer, or those 2 and a container?

That's the line you need to replace.

 

I haven't done anything with backpack type stuff, but i know what you need:

Something with IInventory

A GuiContainer class

A Container class

A GuiHandler (you already got one)

 

Now when I right-click the block, it opens the gui then immediately closes it. Any suggestions?

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Show all classes related to your backpack item.

Don't PM me with questions. They will be ignored! Make a thread on the appropriate board for support.

 

1.12 -> 1.13 primer by williewillus.

 

1.7.10 and older versions of Minecraft are no longer supported due to it's age! Update to the latest version for support.

 

http://www.howoldisminecraft1710.today/

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