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[1.6.4] Game crashing when using a NBT

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Posted January 6, 201411 yr

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.

January 6, 201411 yr

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.

January 6, 201411 yr

Author

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.

January 6, 201411 yr

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.

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.

January 6, 201411 yr

Author

so what should I do from keeping it from null (NOOBIE QUESTION : )

Not new to java >> New to modding.

January 6, 201411 yr

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/

January 6, 201411 yr

Author

ok what then?

Not new to java >> New to modding.

This topic is now closed to further replies.

https://forums.minecraftforge.net/topic/15097-164-game-crashing-when-using-a-nbt/

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[1.6.4] Game crashing when using a NBT

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