Run code on item in hand?

robertcars · August 16, 2014

I am trying to run a method when someone pulls out the item on the hot bar. So if the item is in the third slot and the player switches to that I need it to run a method. How would I do that?

hugo_the_dwarf · August 16, 2014

Two ways that *I* know (there is probably more)

Items have an onUpdate method (currently vanilla maps use this)

@Override
public void onUpdate(ItemStack par1ItemStack, World par2World,
		Entity par3Entity, int par4, boolean par5) {
	// TODO Auto-generated method stub
	super.onUpdate(par1ItemStack, par2World, par3Entity, par4, par5);

	if (par3Entity instanceof EntityPlayer) 
	{
		EntityPlayer player = (EntityPlayer)par3Entity;
		if (player.getHeldItem().equals(par1ItemStack) && player.inventory.getStackInSlot(2).equals(par1ItemStack))
		{
			//Do stuff
		}
	}
}

Hotbar slots in the players inventory is 0-8 (1 to 9 left to right) now this way it runs like every tick, I normally build my own cool down system but that gets glitchy if you have many of the same item (including other players having the item)

Second would be to make your own event that checks the livingUpdateEvent or a event that fits better.

robertcars · August 16, 2014

When ever I put the item in the hot bar it crashes. I did try changing one thing because I want it to run that code everytime the item is pulled out not just in slot 2.

     @Override
	public void onUpdate(ItemStack par1ItemStack, World par2World, Entity par3Entity, int par4, boolean par5) {
		super.onUpdate(par1ItemStack, par2World, par3Entity, par4, par5);

		if (par3Entity instanceof EntityPlayer)  {
			EntityPlayer player = (EntityPlayer)par3Entity;
			if (player.getHeldItem().equals(par1ItemStack)) {
				System.out.println("Test");
			}
		}
	}

hugo_the_dwarf · August 16, 2014

Ah I bet the error is null pointer exception? what is the error that the console spits out?

robertcars · August 16, 2014

net.minecraft.util.ReportedException: Ticking entity
at net.minecraft.world.World.updateEntities(World.java:2102) ~[World.class:?]
at net.minecraft.client.Minecraft.runTick(Minecraft.java:2096) ~[Minecraft.class:?]
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1038) ~[Minecraft.class:?]
at net.minecraft.client.Minecraft.run(Minecraft.java:961) [Minecraft.class:?]
at net.minecraft.client.main.Main.main(Main.java:164) [Main.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_45]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_45]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_45]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_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:?]
Caused by: java.lang.NullPointerException
at com.robert.modulartools.items.ModAxe.onUpdate(ModAxe.java:64) ~[ModAxe.class:?]
at net.minecraft.item.ItemStack.updateAnimation(ItemStack.java:478) ~[itemStack.class:?]
at net.minecraft.entity.player.InventoryPlayer.decrementAnimations(InventoryPlayer.java:349) ~[inventoryPlayer.class:?]
at net.minecraft.entity.player.EntityPlayer.onLivingUpdate(EntityPlayer.java:624) ~[EntityPlayer.class:?]
at net.minecraft.client.entity.EntityPlayerSP.onLivingUpdate(EntityPlayerSP.java:299) ~[EntityPlayerSP.class:?]
at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:1826) ~[EntityLivingBase.class:?]
at net.minecraft.entity.player.EntityPlayer.onUpdate(EntityPlayer.java:341) ~[EntityPlayer.class:?]
at net.minecraft.client.entity.EntityClientPlayerMP.onUpdate(EntityClientPlayerMP.java:100) ~[EntityClientPlayerMP.class:?]
at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2277) ~[World.class:?]
at net.minecraft.world.World.updateEntity(World.java:2237) ~[World.class:?]
at net.minecraft.world.World.updateEntities(World.java:2087) ~[World.class:?]
... 10 more
---- Minecraft Crash Report ----
// But it works on my machine.

Time: 8/16/14 2:56 PM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at com.robert.modulartools.items.ModAxe.onUpdate(ModAxe.java:64)
at net.minecraft.item.ItemStack.updateAnimation(ItemStack.java:478)
at net.minecraft.entity.player.InventoryPlayer.decrementAnimations(InventoryPlayer.java:349)
at net.minecraft.entity.player.EntityPlayer.onLivingUpdate(EntityPlayer.java:624)
at net.minecraft.client.entity.EntityPlayerSP.onLivingUpdate(EntityPlayerSP.java:299)
at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:1826)
at net.minecraft.entity.player.EntityPlayer.onUpdate(EntityPlayer.java:341)
at net.minecraft.client.entity.EntityClientPlayerMP.onUpdate(EntityClientPlayerMP.java:100)
at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2277)
at net.minecraft.world.World.updateEntity(World.java:2237)
at net.minecraft.world.World.updateEntities(World.java:2087)
at net.minecraft.client.Minecraft.runTick(Minecraft.java:2096)
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1038)
at net.minecraft.client.Minecraft.run(Minecraft.java:961)
at net.minecraft.client.main.Main.main(Main.java:164)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)


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

-- Head --
Stacktrace:
at com.robert.modulartools.items.ModAxe.onUpdate(ModAxe.java:64)
at net.minecraft.item.ItemStack.updateAnimation(ItemStack.java:478)
at net.minecraft.entity.player.InventoryPlayer.decrementAnimations(InventoryPlayer.java:349)
at net.minecraft.entity.player.EntityPlayer.onLivingUpdate(EntityPlayer.java:624)
at net.minecraft.client.entity.EntityPlayerSP.onLivingUpdate(EntityPlayerSP.java:299)
at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:1826)
at net.minecraft.entity.player.EntityPlayer.onUpdate(EntityPlayer.java:341)
at net.minecraft.client.entity.EntityClientPlayerMP.onUpdate(EntityClientPlayerMP.java:100)
at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2277)
at net.minecraft.world.World.updateEntity(World.java:2237)

-- Entity being ticked --
Details:
Entity Type: null (net.minecraft.client.entity.EntityClientPlayerMP)
Entity ID: 275
Entity Name: Player250
Entity's Exact location: 238.10, 73.62, 265.17
Entity's Block location: World: (238,73,265), Chunk: (at 14,4,9 in 14,16; contains blocks 224,0,256 to 239,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Entity's Momentum: 0.00, -0.08, 0.00
Stacktrace:
at net.minecraft.world.World.updateEntities(World.java:2087)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Player250'/275, l='MpServer', x=238.10, y=73.62, z=265.17]]
Chunk stats: MultiplayerChunkCache: 110, 110
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options: 
Level spawn location: World: (200,64,248), Chunk: (at 8,4,8 in 12,15; contains blocks 192,0,240 to 207,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 1344 game time, 1344 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 52 total; [EntityChicken['Chicken'/143, l='MpServer', x=160.50, y=68.00, z=253.50], EntityChicken['Chicken'/142, l='MpServer', x=161.50, y=69.00, z=249.50], EntityChicken['Chicken'/152, l='MpServer', x=175.46, y=69.00, z=216.54], EntityItem['item.item.seeds'/153, l='MpServer', x=182.22, y=68.13, z=236.31], EntityChicken['Chicken'/154, l='MpServer', x=188.44, y=66.00, z=252.56], EntityChicken['Chicken'/155, l='MpServer', x=176.53, y=65.00, z=255.47], EntityChicken['Chicken'/156, l='MpServer', x=185.53, y=65.00, z=264.41], EntityBat['Bat'/157, l='MpServer', x=204.62, y=33.72, z=219.20], EntityBat['Bat'/158, l='MpServer', x=200.86, y=33.01, z=221.79], EntityChicken['Chicken'/159, l='MpServer', x=200.44, y=70.00, z=319.59], EntityChicken['Chicken'/144, l='MpServer', x=171.41, y=67.00, z=251.66], EntityChicken['Chicken'/149, l='MpServer', x=181.50, y=70.00, z=211.50], EntityChicken['Chicken'/150, l='MpServer', x=181.50, y=70.00, z=213.50], EntityChicken['Chicken'/151, l='MpServer', x=187.47, y=70.00, z=216.47], EntityChicken['Chicken'/170, l='MpServer', x=211.56, y=69.00, z=324.47], EntityChicken['Chicken'/169, l='MpServer', x=209.53, y=69.00, z=323.53], EntityBat['Bat'/168, l='MpServer', x=213.14, y=18.04, z=327.59], EntityChicken['Chicken'/160, l='MpServer', x=194.56, y=69.00, z=321.59], EntityChicken['Chicken'/167, l='MpServer', x=222.44, y=66.00, z=279.47], EntityChicken['Chicken'/166, l='MpServer', x=222.34, y=65.00, z=278.38], EntityChicken['Chicken'/165, l='MpServer', x=211.56, y=65.00, z=279.47], EntityChicken['Chicken'/186, l='MpServer', x=236.88, y=64.00, z=279.81], EntityBat['Bat'/187, l='MpServer', x=240.70, y=30.00, z=334.12], EntityCow['Cow'/185, l='MpServer', x=239.63, y=60.00, z=287.38], EntityClientPlayerMP['Player250'/275, l='MpServer', x=238.10, y=73.62, z=265.17], EntityBat['Bat'/205, l='MpServer', x=246.54, y=26.81, z=298.92], EntityCow['Cow'/204, l='MpServer', x=247.47, y=68.00, z=277.47], EntityBat['Bat'/207, l='MpServer', x=248.92, y=21.00, z=314.43], EntityBat['Bat'/206, l='MpServer', x=246.42, y=27.12, z=300.01], EntityCow['Cow'/201, l='MpServer', x=252.47, y=63.00, z=245.75], EntityCow['Cow'/200, l='MpServer', x=246.53, y=63.00, z=247.50], EntityCow['Cow'/203, l='MpServer', x=242.50, y=67.00, z=276.38], EntityCow['Cow'/202, l='MpServer', x=250.69, y=64.00, z=285.53], EntityChicken['Chicken'/197, l='MpServer', x=246.50, y=64.00, z=233.50], EntityChicken['Chicken'/196, l='MpServer', x=255.59, y=65.00, z=232.53], EntityCow['Cow'/199, l='MpServer', x=246.53, y=63.00, z=247.50], EntityCow['Cow'/198, l='MpServer', x=245.47, y=63.00, z=247.50], EntityChicken['Chicken'/195, l='MpServer', x=246.50, y=64.00, z=234.19], EntityChicken['Chicken'/194, l='MpServer', x=245.50, y=64.00, z=233.50], EntityBat['Bat'/223, l='MpServer', x=281.75, y=22.10, z=231.25], EntityBat['Bat'/216, l='MpServer', x=274.01, y=51.66, z=312.15], EntityBat['Bat'/212, l='MpServer', x=265.21, y=37.30, z=299.28], EntityBat['Bat'/213, l='MpServer', x=266.52, y=56.24, z=314.18], EntityBat['Bat'/214, l='MpServer', x=264.56, y=60.10, z=306.38], EntityBat['Bat'/215, l='MpServer', x=268.92, y=56.67, z=315.09], EntityBat['Bat'/211, l='MpServer', x=269.50, y=48.10, z=267.25], EntityBat['Bat'/227, l='MpServer', x=286.47, y=39.05, z=281.83], EntityBat['Bat'/226, l='MpServer', x=277.38, y=47.10, z=272.50], EntityChicken['Chicken'/225, l='MpServer', x=276.47, y=62.23, z=262.53], EntityChicken['Chicken'/224, l='MpServer', x=276.41, y=62.30, z=267.41], EntityBat['Bat'/248, l='MpServer', x=297.25, y=47.45, z=294.33], EntityItem['item.tile.mushroom'/247, l='MpServer', x=296.13, y=22.13, z=241.88]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.addWorldInfoToCrashReport(WorldClient.java:417)
at net.minecraft.client.Minecraft.addGraphicsAndWorldToCrashReport(Minecraft.java:2567)
at net.minecraft.client.Minecraft.run(Minecraft.java:983)
at net.minecraft.client.main.Main.main(Main.java:164)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

hugo_the_dwarf · August 16, 2014

What is on like 64? the If statement? might have to do another check of

if (player.getHeldItem() != null)

{

if (player.getHeldItem().equals(par1ItemStack)) {

System.out.println("Test");

}

robertcars · August 16, 2014

Yes line 64 is the if statement but the extra check didnt work it still crashed. It crashes as soon as the item goes into the hot bar.

net.minecraft.util.ReportedException: Ticking entity
at net.minecraft.world.World.updateEntities(World.java:2102) ~[World.class:?]
at net.minecraft.client.Minecraft.runTick(Minecraft.java:2096) ~[Minecraft.class:?]
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1038) ~[Minecraft.class:?]
at net.minecraft.client.Minecraft.run(Minecraft.java:961) [Minecraft.class:?]
at net.minecraft.client.main.Main.main(Main.java:164) [Main.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_45]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_45]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_45]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_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:?]
Caused by: java.lang.NullPointerException
at com.robert.modulartools.items.ModAxe.onUpdate(ModAxe.java:62) ~[ModAxe.class:?]
at net.minecraft.item.ItemStack.updateAnimation(ItemStack.java:478) ~[itemStack.class:?]
at net.minecraft.entity.player.InventoryPlayer.decrementAnimations(InventoryPlayer.java:349) ~[inventoryPlayer.class:?]
at net.minecraft.entity.player.EntityPlayer.onLivingUpdate(EntityPlayer.java:624) ~[EntityPlayer.class:?]
at net.minecraft.client.entity.EntityPlayerSP.onLivingUpdate(EntityPlayerSP.java:299) ~[EntityPlayerSP.class:?]
at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:1826) ~[EntityLivingBase.class:?]
at net.minecraft.entity.player.EntityPlayer.onUpdate(EntityPlayer.java:341) ~[EntityPlayer.class:?]
at net.minecraft.client.entity.EntityClientPlayerMP.onUpdate(EntityClientPlayerMP.java:100) ~[EntityClientPlayerMP.class:?]
at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2277) ~[World.class:?]
at net.minecraft.world.World.updateEntity(World.java:2237) ~[World.class:?]
at net.minecraft.world.World.updateEntities(World.java:2087) ~[World.class:?]
... 10 more
---- Minecraft Crash Report ----
// There are four lights!

Time: 8/16/14 3:05 PM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at com.robert.modulartools.items.ModAxe.onUpdate(ModAxe.java:62)
at net.minecraft.item.ItemStack.updateAnimation(ItemStack.java:478)
at net.minecraft.entity.player.InventoryPlayer.decrementAnimations(InventoryPlayer.java:349)
at net.minecraft.entity.player.EntityPlayer.onLivingUpdate(EntityPlayer.java:624)
at net.minecraft.client.entity.EntityPlayerSP.onLivingUpdate(EntityPlayerSP.java:299)
at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:1826)
at net.minecraft.entity.player.EntityPlayer.onUpdate(EntityPlayer.java:341)
at net.minecraft.client.entity.EntityClientPlayerMP.onUpdate(EntityClientPlayerMP.java:100)
at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2277)
at net.minecraft.world.World.updateEntity(World.java:2237)
at net.minecraft.world.World.updateEntities(World.java:2087)
at net.minecraft.client.Minecraft.runTick(Minecraft.java:2096)
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1038)
at net.minecraft.client.Minecraft.run(Minecraft.java:961)
at net.minecraft.client.main.Main.main(Main.java:164)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)


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

-- Head --
Stacktrace:
at com.robert.modulartools.items.ModAxe.onUpdate(ModAxe.java:62)
at net.minecraft.item.ItemStack.updateAnimation(ItemStack.java:478)
at net.minecraft.entity.player.InventoryPlayer.decrementAnimations(InventoryPlayer.java:349)
at net.minecraft.entity.player.EntityPlayer.onLivingUpdate(EntityPlayer.java:624)
at net.minecraft.client.entity.EntityPlayerSP.onLivingUpdate(EntityPlayerSP.java:299)
at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:1826)
at net.minecraft.entity.player.EntityPlayer.onUpdate(EntityPlayer.java:341)
at net.minecraft.client.entity.EntityClientPlayerMP.onUpdate(EntityClientPlayerMP.java:100)
at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2277)
at net.minecraft.world.World.updateEntity(World.java:2237)

-- Entity being ticked --
Details:
Entity Type: null (net.minecraft.client.entity.EntityClientPlayerMP)
Entity ID: 224
Entity Name: Player937
Entity's Exact location: -247.50, 63.62, 214.50
Entity's Block location: World: (-248,63,214), Chunk: (at 8,3,6 in -16,13; contains blocks -256,0,208 to -241,255,223), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Entity's Momentum: 0.00, -0.02, 0.00
Stacktrace:
at net.minecraft.world.World.updateEntities(World.java:2087)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Player937'/224, l='MpServer', x=-247.50, y=63.62, z=214.50]]
Chunk stats: MultiplayerChunkCache: 265, 265
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options: 
Level spawn location: World: (-256,64,224), Chunk: (at 0,4,0 in -16,14; contains blocks -256,0,224 to -241,255,239), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 61 game time, 61 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 74 total; [EntityFallingBlock['Falling Block'/1363, l='MpServer', x=-333.50, y=26.49, z=322.50], EntityFallingBlock['Falling Block'/1479, l='MpServer', x=-303.50, y=60.38, z=126.50], EntityFallingBlock['Falling Block'/1478, l='MpServer', x=-311.50, y=3.38, z=118.50], EntityFallingBlock['Falling Block'/1477, l='MpServer', x=-308.50, y=4.38, z=121.50], EntityFallingBlock['Falling Block'/1476, l='MpServer', x=-309.50, y=3.38, z=121.50], EntityFallingBlock['Falling Block'/1475, l='MpServer', x=-307.50, y=4.38, z=121.50], EntityFallingBlock['Falling Block'/1474, l='MpServer', x=-311.50, y=65.38, z=100.50], EntityFallingBlock['Falling Block'/1473, l='MpServer', x=-309.50, y=65.38, z=99.50], EntityFallingBlock['Falling Block'/1472, l='MpServer', x=-310.50, y=65.38, z=100.50], EntityFallingBlock['Falling Block'/1484, l='MpServer', x=-304.50, y=60.38, z=126.50], EntityFallingBlock['Falling Block'/1483, l='MpServer', x=-305.50, y=61.38, z=125.50], EntityBat['Bat'/1346, l='MpServer', x=-208.78, y=37.28, z=181.46], EntityFallingBlock['Falling Block'/1482, l='MpServer', x=-305.50, y=61.38, z=124.50], EntityFallingBlock['Falling Block'/1481, l='MpServer', x=-306.50, y=61.38, z=124.50], EntityFallingBlock['Falling Block'/1480, l='MpServer', x=-304.50, y=60.38, z=124.50], EntityBat['Bat'/1345, l='MpServer', x=-201.66, y=37.10, z=178.93], EntitySquid['Squid'/305, l='MpServer', x=-299.69, y=59.13, z=228.92], EntitySquid['Squid'/304, l='MpServer', x=-299.73, y=58.22, z=230.01], EntitySquid['Squid'/307, l='MpServer', x=-292.50, y=57.85, z=235.50], EntitySquid['Squid'/306, l='MpServer', x=-300.54, y=59.38, z=232.28], EntitySquid['Squid'/308, l='MpServer', x=-295.59, y=59.28, z=232.80], EntityBat['Bat'/1264, l='MpServer', x=-265.06, y=23.14, z=243.76], EntityFallingBlock['Falling Block'/1513, l='MpServer', x=-304.50, y=61.50, z=124.50], EntityChicken['Chicken'/63, l='MpServer', x=-307.50, y=63.00, z=161.50], EntityFallingBlock['Falling Block'/1512, l='MpServer', x=-304.50, y=61.50, z=123.50], EntityChicken['Chicken'/62, l='MpServer', x=-310.50, y=63.00, z=161.50], EntityBat['Bat'/897, l='MpServer', x=-210.50, y=54.90, z=240.34], EntityFallingBlock['Falling Block'/1514, l='MpServer', x=-304.50, y=61.50, z=125.50], EntitySquid['Squid'/303, l='MpServer', x=-297.66, y=57.31, z=229.85], EntityChicken['Chicken'/68, l='MpServer', x=-303.50, y=68.00, z=208.50], EntityChicken['Chicken'/69, l='MpServer', x=-302.50, y=68.00, z=209.50], EntityChicken['Chicken'/70, l='MpServer', x=-291.50, y=64.00, z=142.50], EntityChicken['Chicken'/71, l='MpServer', x=-293.50, y=68.00, z=146.50], EntityChicken['Chicken'/64, l='MpServer', x=-306.50, y=63.00, z=158.50], EntityChicken['Chicken'/65, l='MpServer', x=-306.50, y=63.00, z=158.50], EntityChicken['Chicken'/66, l='MpServer', x=-306.50, y=65.00, z=212.50], EntityChicken['Chicken'/67, l='MpServer', x=-305.50, y=67.00, z=209.50], EntityChicken['Chicken'/76, l='MpServer', x=-282.50, y=66.00, z=201.50], EntityChicken['Chicken'/77, l='MpServer', x=-281.50, y=66.00, z=201.50], EntityChicken['Chicken'/72, l='MpServer', x=-293.50, y=63.00, z=145.50], EntityBat['Bat'/893, l='MpServer', x=-211.72, y=55.25, z=243.09], EntityChicken['Chicken'/73, l='MpServer', x=-290.50, y=63.00, z=148.50], EntityChicken['Chicken'/74, l='MpServer', x=-281.79, y=67.00, z=204.16], EntityChicken['Chicken'/75, l='MpServer', x=-282.50, y=66.00, z=203.50], EntityChicken['Chicken'/85, l='MpServer', x=-270.50, y=71.00, z=229.50], EntityChicken['Chicken'/84, l='MpServer', x=-270.50, y=71.00, z=229.50], EntityFallingBlock['Falling Block'/1288, l='MpServer', x=-362.50, y=16.49, z=178.50], EntityFallingBlock['Falling Block'/1289, l='MpServer', x=-362.50, y=17.49, z=179.50], EntityChicken['Chicken'/83, l='MpServer', x=-275.74, y=67.00, z=229.72], EntityChicken['Chicken'/82, l='MpServer', x=-270.50, y=70.00, z=227.50], EntityChicken['Chicken'/93, l='MpServer', x=-241.50, y=63.00, z=164.50], EntityChicken['Chicken'/95, l='MpServer', x=-245.50, y=64.00, z=158.50], EntityChicken['Chicken'/94, l='MpServer', x=-245.50, y=64.00, z=160.50], EntitySheep['Sheep'/102, l='MpServer', x=-208.35, y=72.00, z=231.55], EntitySheep['Sheep'/103, l='MpServer', x=-207.94, y=72.00, z=230.46], EntitySheep['Sheep'/101, l='MpServer', x=-209.44, y=72.00, z=231.50], EntityBat['Bat'/374, l='MpServer', x=-237.21, y=36.29, z=180.39], EntityFallingBlock['Falling Block'/1462, l='MpServer', x=-306.50, y=64.38, z=100.50], EntityChicken['Chicken'/96, l='MpServer', x=-244.50, y=64.00, z=158.50], EntityFallingBlock['Falling Block'/1463, l='MpServer', x=-307.50, y=64.38, z=100.50], EntityFallingBlock['Falling Block'/1464, l='MpServer', x=-307.50, y=64.38, z=101.50], EntityFallingBlock['Falling Block'/1465, l='MpServer', x=-306.50, y=64.38, z=99.50], EntityFallingBlock['Falling Block'/1466, l='MpServer', x=-306.50, y=64.38, z=101.50], EntityClientPlayerMP['Player937'/224, l='MpServer', x=-247.50, y=63.62, z=214.50], EntityFallingBlock['Falling Block'/1467, l='MpServer', x=-308.50, y=65.38, z=100.50], EntityFallingBlock['Falling Block'/1468, l='MpServer', x=-307.50, y=65.38, z=99.50], EntityFallingBlock['Falling Block'/1469, l='MpServer', x=-308.50, y=64.38, z=101.50], EntityFallingBlock['Falling Block'/1470, l='MpServer', x=-308.50, y=65.38, z=99.50], EntitySheep['Sheep'/104, l='MpServer', x=-205.69, y=72.00, z=230.41], EntityFallingBlock['Falling Block'/1471, l='MpServer', x=-309.50, y=65.38, z=100.50], EntitySheep['Sheep'/116, l='MpServer', x=-173.50, y=71.00, z=273.50], EntitySheep['Sheep'/115, l='MpServer', x=-170.50, y=71.00, z=273.97], EntitySheep['Sheep'/114, l='MpServer', x=-171.81, y=72.00, z=271.19], EntitySheep['Sheep'/113, l='MpServer', x=-170.22, y=72.00, z=272.47]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.addWorldInfoToCrashReport(WorldClient.java:417)
at net.minecraft.client.Minecraft.addGraphicsAndWorldToCrashReport(Minecraft.java:2567)
at net.minecraft.client.Minecraft.run(Minecraft.java:983)
at net.minecraft.client.main.Main.main(Main.java:164)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

hugo_the_dwarf · August 16, 2014

hmm... works for me just fine.

@Override
public void onUpdate(ItemStack par1ItemStack, World par2World,
		Entity par3Entity, int par4, boolean par5) {
	// TODO Auto-generated method stub
	super.onUpdate(par1ItemStack, par2World, par3Entity, par4, par5);

	if (par3Entity instanceof EntityPlayer)
	{
		EntityPlayer player = (EntityPlayer)par3Entity;
		if (player.getHeldItem() != null)
		{
			if (player.getHeldItem().equals(par1ItemStack))
			{
				System.out.println("test");
			}
		}
	}
}

robertcars · August 16, 2014

It looks like I messed up something. I got it working now. Thank you so much for your help.

hugo_the_dwarf · August 16, 2014

no problem, just remember there are probably other ways out there to do what you want, and they might be better.

shieldbug1 · August 17, 2014

Yup, the way hugo_the_dwarf suggested is the 'right' way to do it if you're using your own custom item.

If you needed to do this with a vanilla item, however, then you'd be using either the LivingUpdateEvent or the TickEvent.PlayerTick.

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