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[1.6.4] Game crashing when using a NBT

gmod622

By gmod622
in Modder Support

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gmod622 Creeper Killer

gmod622

Posted
Posted

When I load up a world and hover over my item, I crash with this error :

 

 

 2014-01-05 18:18:30 [iNFO] [sTDOUT] java.lang.NullPointerException
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at gmod.mods.roleplay.main.common.item.ItemLicence.addInformation(ItemLicence.java:54)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.item.ItemStack.getTooltip(ItemStack.java:663)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.gui.inventory.GuiContainer.drawItemStackTooltip(GuiContainer.java:226)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.gui.inventory.GuiContainerCreative.drawItemStackTooltip(GuiContainerCreative.java:778)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.gui.inventory.GuiContainer.drawScreen(GuiContainer.java:202)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.renderer.InventoryEffectRenderer.drawScreen(InventoryEffectRenderer.java:43)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.gui.inventory.GuiContainerCreative.drawScreen(GuiContainerCreative.java:683)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1036)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:946)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.Minecraft.run(Minecraft.java:838)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.main.Main.main(Main.java:93)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at java.lang.reflect.Method.invoke(Unknown Source)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 
2014-01-05 18:18:30 [iNFO] [sTDOUT] 
2014-01-05 18:18:30 [iNFO] [sTDOUT] A detailed walkthrough of the error, its code path and all known details is as follows:
2014-01-05 18:18:30 [iNFO] [sTDOUT] ---------------------------------------------------------------------------------------
2014-01-05 18:18:30 [iNFO] [sTDOUT] 
2014-01-05 18:18:30 [iNFO] [sTDOUT] -- Head --
2014-01-05 18:18:30 [iNFO] [sTDOUT] Stacktrace:
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at gmod.mods.roleplay.main.common.item.ItemLicence.addInformation(ItemLicence.java:54)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.item.ItemStack.getTooltip(ItemStack.java:663)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.gui.inventory.GuiContainer.drawItemStackTooltip(GuiContainer.java:226)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.gui.inventory.GuiContainerCreative.drawItemStackTooltip(GuiContainerCreative.java:778)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.gui.inventory.GuiContainer.drawScreen(GuiContainer.java:202)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.renderer.InventoryEffectRenderer.drawScreen(InventoryEffectRenderer.java:43)
2014-01-05 18:18:30 [iNFO] [sTDOUT] 	at net.minecraft.client.gui.inventory.GuiContainerCreative.drawScreen(GuiContainerCreative.java:683)
2014-01-05 18:18:30 [iNFO] [sTDOUT]

 

 

My item code:

 

 

 package gmod.mods.roleplay.main.common.item;


import gmod.mods.roleplay.main.main_roleplay;

import java.util.List;



import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.world.World;

public class ItemLicence extends Item {

public ItemLicence(int par1) {
	super(par1);
	this.setCreativeTab(main_roleplay.tabRoleplay);
}

public static int theRandom;


 public ItemStack onItemRightClick(ItemStack par1ItemStack, World par2World, EntityPlayer par3EntityPlayer) {
	//here you can use the information about the itemstack nbt
	//ex:


	 if(par1ItemStack.stackTagCompound == null){
		//here we know the nbt is null
		 par1ItemStack.stackTagCompound = new NBTTagCompound();
		}else {

		 theRandom = par1ItemStack.stackTagCompound.getInteger("myRandomNumber");
			if(theRandom == 0){
				//here we DONT have anythin on the stack compound
				par1ItemStack.stackTagCompound.setInteger("myRandomNumber", (int)(Math.random()*100000));//generate a number between 0-100 and place it on the nbt
			}else{
			//	System.out.println("the number of this item is: "+theRandom);
			}
 }


			return par1ItemStack;

 }
 public void addInformation(ItemStack par1ItemStack, EntityPlayer par2EntityPlayer, List par3List, boolean par4)
 {
	        NBTTagCompound stackCompound = par1ItemStack.getTagCompound();
	        int idToDisplay = stackCompound.getInteger("myRandomNumber");
	        par3List.add("ID: " + idToDisplay);
	    }




}

 

 

 

 

Any help be appreciated

Not new to java >> New to modding.

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Draco18s Reality Controller

Draco18s

Posted
Posted

Well...if you never right-click it (which checks the nbt tag for null and if it is, sets values) what did you EXPECT to happen?

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

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gmod622 Creeper Killer

gmod622

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  • Author
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how would I stop from it becoming null, ive already tried to check if the random number is equal to 0 execute the command, and ive tried using the nbt and checking if is(not) equal to 0, then do the command give; the code is  shown here (THIS DOES NOT WORK; EXAMPLE) :

 

      
public void addInformation(ItemStack par1ItemStack, EntityPlayer par2EntityPlayer, List par3List, boolean par4) {
    
    		if(par1ItemStack.stackTagCompound.getInteger("myRandomNumber") /* != */ == 0) {
    	NBTTagCompound stackCompound = par1ItemStack.getTagCompound(); 
        int idToDisplay = par1ItemStack.stackTagCompound.getInteger("myRandomNumber");
        par3List.add("ID: " + idToDisplay);
    		}
      }

Not new to java >> New to modding.

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Draco18s Reality Controller

Draco18s

Posted
Posted

It's not BECOMING null, it hasn't ever been SET YET.  The variable DOES NOT EXIST for you to see if it is not-zero.

 

Order of operations, dude.

 

if(par1ItemStack.stackTagCompound.getInteger("myRandomNumber") /* != */ == 0) {

 

THIS WILL FAIL BECAUSE stackTagCompound IS NULL RIGHT NOW.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

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larsgerrits Reality Controller

larsgerrits

Posted
Posted 
if(par1ItemStack.stackTagCompound.getInteger("myRandomNumber") != null)

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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