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Problem with decreasing stackSize in player's inventory


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I think I have a very strange problem here:


I want to decrease the stackSize of an Item called "ExplodeArrow" when i right click with an Item called "ExplodeGun" and this is how i did it for now:


onItemRightClick(...) in ExplodeGun.java


    public ItemStack onItemRightClick(ItemStack is, World world, EntityPlayer ep)

        return is;



Now the problem:

When i right click my ExplodeGun, the stackSize of my ExplodeArrow decreases, but it won't show up. Only if I restart my Minecraft, the decreased stackSize shows up. I hope that you know what i mean. The stackSize decreases, but you won't see it In-Game until you restart Minecraft. The very strange thing is, that when i edit my ItemStack (is) in the method like "is.stackSize++", it all works and the stackSize of the Arrow decreases In-Game, too.


I hope you can help me,

sorry for my bad english :)

thanks to everyone,



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