[Unsolved]Creative Tab NullPointerException when Rendering

[ean521]

I got this during a crash in Eclipse when I attempted to move onto the second page of tabs:

 

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Time: 5/6/14 4:19 PM

Description: Rendering item

 

java.lang.NullPointerException: Rendering item

at net.minecraft.item.ItemStack.getItemDamage(ItemStack.java:266)

at net.minecraft.client.renderer.entity.RenderItem.renderItemIntoGUI(RenderItem.java:415)

at net.minecraft.client.renderer.entity.RenderItem.renderItemAndEffectIntoGUI(RenderItem.java:560)

at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147051_a(GuiContainerCreative.java:966)

atnet.minecraft.client.gui.inventory.GuiContainerCreative.drawGuiContainerBackgroundLayer(GuiContainerCreative.java:794)

at net.minecraft.client.gui.inventory.GuiContainer.drawScreen(GuiContainer.java:97)

at net.minecraft.client.renderer.InventoryEffectRenderer.drawScreen(InventoryEffectRenderer.java:44)

at net.minecraft.client.gui.inventory.GuiContainerCreative.drawScreen(GuiContainerCreative.java:672)

at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1143)

at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1023)

at net.minecraft.client.Minecraft.run(Minecraft.java:910)

at net.minecraft.client.main.Main.main(Main.java:112)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)

at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

 

 

 

I honestly cannot figure out how to fix it. I know it has something to do with the item on the tab label. I am using Forge

1.7.2-10.12.1.1060 if it helps. Here also is the code for my tab and every reference to it:

 

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package com.gmail.eanwowmaster;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.init.Blocks;
import net.minecraft.item.Item;
import net.minecraft.block.material.Material;

public class EancraftTabs extends CreativeTabs {

public EancraftTabs(String tabLabel) {
	super(tabLabel);
}

@Override
@SideOnly(Side.CLIENT)
public Item getTabIconItem() {
	return Item.getItemFromBlock(new EanOre(Material.rock));
}
}

public static CreativeTabs eancraftTab = new EancraftTabs("Eancraft");

	setCreativeTab(Eancraft.eancraftTab);

(I didn't put the code directly above in several times because it would be a waste of my typing and your reading)

 

 

Can anybody help me? I honestly have no idea how to fix it. I am new to Forge modding and this is my first mod, so I'm not surprised I can't fix this error.

[larsgerrits]

Before the "Eancraft" in the CreativeTab initilialization, put CreativeTas.getNextId().

[GotoLink]

return Item.getItemFromBlock(new EanOre(Material.rock));

You need to return a registered item or block. That new stuff isn't registered, Minecraft can't render it.

Replace with an instance you made and registered in the FMLPreInitialization event.

[ean521]

Thank you, but I got the same error after changing the code to an instance of EanOre. The new code is:

 

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package com.gmail.eanwowmaster;

 

import cpw.mods.fml.relauncher.Side;

import cpw.mods.fml.relauncher.SideOnly;

import net.minecraft.creativetab.CreativeTabs;

import net.minecraft.init.Blocks;

import net.minecraft.item.Item;

import net.minecraft.block.material.Material;

 

public class EancraftTabs extends CreativeTabs {

 

public EancraftTabs(String lable) {

super(lable);

}

 

@Override

@SideOnly(Side.CLIENT)

public Item getTabIconItem() {

return Item.getItemFromBlock(Eancraft.eanOre);

}

}

 

 

I honestly thought that would fix it. Well, is there actually a way to fix it?

[GotoLink]

You may want to check that Eancraft.eanOre is really not null. Use a breakpoint if possible.

The creative tab also needs at least an item or block to render inside its slots.

[ean521]

I just ran it with a breakpoint and it is null... so how am I supposed to make it not null? BTW, it has items in it. EXAMPLE:

 

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package com.gmail.eanwowmaster;

import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.world.World;
import net.minecraft.potion.PotionEffect;

public class Sushi extends Item {

protected Sushi() {
	setCreativeTab(Eancraft.eancraftTab);
	setUnlocalizedName("Sushi");
	setTextureName("eancraft:Sushi");
	setMaxStackSize(64);
}

public ItemStack onEaten(ItemStack itemStack, World world, EntityPlayer player) {
	player.addExhaustion(4.0F);
	player.addPotionEffect(new PotionEffect(9, 1, 1));
	player.addPotionEffect(new PotionEffect(5, 2, 1));
	return itemStack;
}
}

 

 

[Jacky2611]

  On 5/6/2014 at 9:23 PM, ean521 said:

I just ran it with a breakpoint and it is null... so how am I supposed to make it not null? BTW, it has items in it. EXAMPLE:

 

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package com.gmail.eanwowmaster;

import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.world.World;
import net.minecraft.potion.PotionEffect;

public class Sushi extends Item {

protected Sushi() {
	setCreativeTab(Eancraft.eancraftTab);
	setUnlocalizedName("Sushi");
	setTextureName("eancraft:Sushi");
	setMaxStackSize(64);
}

public ItemStack onEaten(ItemStack itemStack, World world, EntityPlayer player) {
	player.addExhaustion(4.0F);
	player.addPotionEffect(new PotionEffect(9, 1, 1));
	player.addPotionEffect(new PotionEffect(5, 2, 1));
	return itemStack;
}
}

 

 

 

On eaten makes.something to food? Good to know...

 

Have you already tried.to us a minecraft item or block? And could you please show me.your mainclass?

[GotoLink]

Then we need to check your Eancraft class.

[ean521]

My Eancraft.class is here:

 

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package com.gmail.eanwowmaster;

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.registry.GameRegistry;
import cpw.mods.fml.common.registry.LanguageRegistry;
import cpw.mods.fml.common.registry.EntityRegistry;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.item.ItemStack;
import net.minecraft.item.Item;
import net.minecraft.item.ItemPickaxe;
import net.minecraft.item.crafting.FurnaceRecipes;
import net.minecraft.item.ItemBlock;
import net.minecraft.block.BlockDirt;
import net.minecraft.entity.EntityList;
import net.minecraft.init.Blocks;
import net.minecraft.init.Items;
import net.minecraftforge.common.ForgeHooks;
import net.minecraftforge.common.MinecraftForge;

import java.util.Random;

import com.gmail.eanwowmaster.proxy.CommonProxy;

@Mod(modid=Eancraft.MODID, name="Eancraft", version="1.0")
public class Eancraft {

public static Block anvilOre = new AnvilOre(Material.rock);
public static Block eanOre = new EanOre(Material.rock);
public static CreativeTabs eancraftTab = new EancraftTabs(CreativeTabs.getNextID(), "Eancraft");
public static Item anvilSword = new AnvilSword();
public static Item sushi = new Sushi();
static final String MODID = "eancraft";

@Instance(value="EancraftMod")
public static Eancraft instance;

@SidedProxy(clientSide="com.gmail.eanwowmaster.proxy.ClientProxy", serverSide="com.gmail.eanwowmaster.proxy.CommonProxy")
public static CommonProxy proxy;

public static void registerEntity(Class entityClass, String name, int primaryColor, int secondaryColor) {
	int entityID = EntityRegistry.findGlobalUniqueEntityId();
	long seed = name.hashCode();
	EntityRegistry.registerGlobalEntityID(entityClass, name, entityID);
	EntityRegistry.registerModEntity(entityClass,  name, entityID,  instance,  64,  1,  true);
	EntityList.entityEggs.put(Integer.valueOf(entityID), new EntityList.EntityEggInfo(entityID, primaryColor, secondaryColor));
}

public void preInit(FMLPreInitializationEvent evt) {
	GameRegistry.registerBlock(anvilOre, anvilOre.getUnlocalizedName().substring(5));
	GameRegistry.registerBlock(eanOre, eanOre.getUnlocalizedName().substring(5));
	GameRegistry.registerItem(anvilSword, anvilSword.getUnlocalizedName().substring(5));
	GameRegistry.registerItem(sushi, sushi.getUnlocalizedName().substring(5));
	registerEntity(Ean.class, "ean", 5, 17);
	proxy.registerRenderers();
}

public void load(FMLInitializationEvent evt) {
	proxy.registerRenderers();
	ItemStack anvilStack = new ItemStack(Blocks.anvil);
	ItemStack ironStack = new ItemStack(Items.iron_ingot);
	ItemStack anvilSwordStack = new ItemStack(anvilSword);
	ItemStack sushiStack = new ItemStack(sushi);
	ItemStack fishStack = new ItemStack(Items.fish);
	ItemStack leafStack = new ItemStack(Blocks.leaves);

	GameRegistry.addRecipe(anvilSwordStack, "x", "x", "y", 'x', anvilStack, 'y', ironStack);
	GameRegistry.addRecipe(sushiStack, "x", "xyx", "x", 'x', fishStack, 'y', leafStack);
}	

public void postInit(FMLPostInitializationEvent evt) {
}		
}

 

 

I can't tell why it would be null. I mean, just look at this beauty! How could it ever be null?!

[GotoLink]

Initialize items and blocks in the PreInit event, please.

 

Also, your @Instance doesn't have the correct modid.

[ean521]

Yeah, the mod ID was me forgetting to change it when I changed the MODID. The rest was me messing around to try and fix the error. It still crashes with the same error, though. D=

[ean521]

I'd just like to bump this because I've not gotten any replies for a while.

 

[ean521]

I just decided to use the Vanilla tabs for my items, but if you can fix this, please tell me!

[tiffit]

Is the item your trying to render with your creative tab actually working in the game? Like can you see it and everything?

[ean521]

No, it actually isn't, and I'm not sure why. I was trying to figure this error when I saw you reply.

[ean521]

Okay, I found this in the console while it was starting up the client; I'm not sure why it can't read the image, though...:

 

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javax.imageio.IIOException: Can't read input file!

at javax.imageio.ImageIO.read(ImageIO.java:1275) ~[?:1.6.0_45]

at net.minecraft.client.Minecraft.readImage(Minecraft.java:639) ~[Minecraft.class:?]

at net.minecraft.client.Minecraft.startGame(Minecraft.java:468) [Minecraft.class:?]

at net.minecraft.client.Minecraft.run(Minecraft.java:890) [Minecraft.class:?]

at net.minecraft.client.main.Main.main(Main.java:112) [Main.class:?]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.6.0_45]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ~[?:1.6.0_45]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[?:1.6.0_45]

at java.lang.reflect.Method.invoke(Method.java:597) ~[?:1.6.0_45]

at net.minecraft.launchwrapper.Launch.launch(Launch.java:134) [launchwrapper-1.9.jar:?]

at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]

 

 

[brandon3055]

I can tell you how i have mine set up maby it will help.

 

Use a separate class for your tab mine looks like this:

(change TolkienTab to whatever you want your tab class to be called)

 

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import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.item.Item;
import tolkienaddon.items.ModItems;
             
public class TolkienTab extends CreativeTabs {
public TolkienTab(final int id, final String modid) {
	super(id, modid);
}

@Override
public Item getTabIconItem()
{
	return ModItems.tclogo; //if you cant get your custom block/item to work try a vanilla block/item e.g. Items.diamond
}
}

 

And in your main class put:

private static CreativeTabs tolkienTab = new TolkienTab(CreativeTabs.getNextID(), References.MODID);

Then to add something to the tab use:

this.setCreativeTab(Tolkienaddon.getCreativeTab());

note: Tolkienaddon is the name of my main class

 

[ean521]

I've now discovered that the error is in the fact that ImageIO can't read the file. I can't see why, though. It has the correct directory and file name, so I'm not sure why it's not working.

[brandon3055]

Is your image a 16x16 png?

[ean521]

It is a png file, and it is 16 pixels by 16 pixels

[GotoLink]

We need the most recent version of your main class, if this isn't the one already.

If it is, the item and block initializing still needs to be put into FMLPreInit, that is how you get textures working.

[ean521]

 

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package com.gmail.eanwowmaster;

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.registry.GameRegistry;
import cpw.mods.fml.common.registry.LanguageRegistry;
import cpw.mods.fml.common.registry.EntityRegistry;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.item.ItemStack;
import net.minecraft.item.Item;
import net.minecraft.item.ItemPickaxe;
import net.minecraft.item.crafting.FurnaceRecipes;
import net.minecraft.item.ItemBlock;
import net.minecraft.block.BlockDirt;
import net.minecraft.entity.EntityList;
import net.minecraft.init.Blocks;
import net.minecraft.init.Items;
import net.minecraftforge.common.ForgeHooks;
import net.minecraftforge.common.MinecraftForge;
import java.util.Random;
import com.gmail.eanwowmaster.proxy.CommonProxy;

@Mod(modid=Eancraft.MODID, name="Eancraft", version="1.0")
public class Eancraft {

public static Block anvilOre;
public static Block eanOre;
public static Item anvilSword;
public static Item sushi;
static final String MODID = "eancraft";

@Instance(value="Eancraft")
public static Eancraft instance;

@SidedProxy(clientSide="com.gmail.eanwowmaster.proxy.ClientProxy", serverSide="com.gmail.eanwowmaster.proxy.CommonProxy")
public static CommonProxy proxy;

public static void registerEntity(Class entityClass, String name, int primaryColor, int secondaryColor) {
	int entityID = EntityRegistry.findGlobalUniqueEntityId();
	long seed = name.hashCode();
	EntityRegistry.registerGlobalEntityID(entityClass, name, entityID);
	EntityRegistry.registerModEntity(entityClass,  name, entityID,  instance,  64,  1,  true);
	EntityList.entityEggs.put(Integer.valueOf(entityID), new EntityList.EntityEggInfo(entityID, primaryColor, secondaryColor));
}

public void preInit(FMLPreInitializationEvent evt) {
	anvilOre = new AnvilOre(Material.rock);
        eanOre = new EanOre(Material.rock);
        anvilSword = new AnvilSword();
        sushi = new Sushi();
	GameRegistry.registerBlock(anvilOre, anvilOre.getUnlocalizedName().substring(5));
	GameRegistry.registerBlock(eanOre, eanOre.getUnlocalizedName().substring(5));
	GameRegistry.registerItem(anvilSword, anvilSword.getUnlocalizedName().substring(5));
	GameRegistry.registerItem(sushi, sushi.getUnlocalizedName().substring(5));
	registerEntity(Ean.class, "ean", 5, 17);
	proxy.registerRenderers();
}

public void load(FMLInitializationEvent evt) {
	proxy.registerRenderers();
	ItemStack anvilStack = new ItemStack(Blocks.anvil);
	ItemStack ironStack = new ItemStack(Items.iron_ingot);
	ItemStack anvilSwordStack = new ItemStack(anvilSword);
	ItemStack sushiStack = new ItemStack(sushi);
	ItemStack fishStack = new ItemStack(Items.fish);
	ItemStack leafStack = new ItemStack(Blocks.leaves);

	GameRegistry.addRecipe(anvilSwordStack, "x", "x", "y", 'x', anvilStack, 'y', ironStack);
	GameRegistry.addRecipe(sushiStack, "x", "xyx", "x", 'x', fishStack, 'y', leafStack);
}	

public void postInit(FMLPostInitializationEvent evt) {
}		
}

 

 

[ean521]

That seemed to be the problem... Now I'm getting a NullPointerException at

cpw.mods.fml.common.registry.EntityRegistry.doModEntityRegistration(/*whatever parameters are here*/)

 

It still can't read the file for some reason. I can probably fix the NullPointerException, though.

[darty11]

  On 5/7/2014 at 12:50 AM, ean521 said:

I just decided to use the Vanilla tabs for my items, but if you can fix this, please tell me!

 

	public static Block anvilOre = new AnvilOre(Material.rock);
public static Block eanOre = new EanOre(Material.rock);
public static CreativeTabs eancraftTab = new EancraftTabs(CreativeTabs.getNextID(), "Eancraft");

Although EanOre is defined here, it is not registered, and is exactly the same as what you had before.

 

I have no experience with creative tabs, but try this:

public static Block anvilOre;
public static Block eanOre;

 

@EventHandle
public void preInit(FMLPreInitializationEvent evt) {

        eanOre = new EanOre(Material.rock);
        GameRegistry.registerBlock(eanOre, eanOre.getUnlocalizedName().substring(5));
        eancraftTab = new EancraftTabs(CreativeTabs.getNextID(), "Eancraft");
        eanOre.setCreativeTab(eancraftTab);
        anvilOre = new AnvilOre(Material.rock);
        anvilSword = new AnvilSword();
        sushi = new Sushi();
	GameRegistry.registerBlock(anvilOre, anvilOre.getUnlocalizedName().substring(5));

	GameRegistry.registerItem(anvilSword, anvilSword.getUnlocalizedName().substring(5));
	GameRegistry.registerItem(sushi, sushi.getUnlocalizedName().substring(5));
	registerEntity(Ean.class, "ean", 5, 17);
	proxy.registerRenderers();

[ean521]

@darty11

That isn't the problem; I was actually just playing around trying to fix the exception.