Hey, i'm simply trying to figure out how to detect a specific item in a players inventory, then run specific actions such as potion effects if its there, which would run under a server tick event. I just can't seem to figure out how to actually detect the item itself.

 

From what I've read, I should use

if(player.inventory.hasItem(ItemRegenerationStone))

but that doesnt seem to work.

 

Any help would be much appreciated.

Is that your own Item? If so:

Use Item#onUpdate() - it runs always when item is in inventory.

 

If that is not your:

Don't use server tick. You want PlayerTickEvent.

then: event.player.inventory and interate through itemstack. Then e.g : if(stack.getItem() == Items.stick)

Note that tick events have 2 phases - pick one. event.phase.

Where/how would i use Item#onUpdate? I would imagine somehow like the following:

 

	 @SubscribeEvent
 public void onUpdate(LivingUpdateEvent event)
 {
	 //seteffects
 }

 

but how do I put in the Item# part and how would I specify the item in question?

override onUpdate in your custom item class(If it is ur own item)

Okay, I'm starting to feel like a pest but I can't get this to work.

 

At this point I am able to at least launch Minecraft and load/make worlds, but when I put the item in my inventory, the game crashes.

 

Here is my code:

 

import net.minecraft.client.Minecraft;
import net.minecraft.entity.Entity;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.potion.Potion;
import net.minecraft.potion.PotionEffect;
import net.minecraft.world.World;

public class ItemRegenerationStone extends Item
{
EntityPlayer player = Minecraft.getMinecraft().thePlayer;

@Override
public void onUpdate(ItemStack itemstack, World world, Entity entity, int i, boolean flag)
{
	player.addPotionEffect(new PotionEffect(Potion.regeneration.id, 100, 1));
}

}

 

I feel like I'm doing something horribly wrong in there but I can't figure out what.\

 

Thanks for the help.

Ah, thank you! That fixed the issue.