damage item crafting [1.9]

[tom2208]

here is my code, but it's not working. If i craft with this item there is a 0 on it and if i put it in my inventory it disappears.

 

Item Class:

public class wooden_pestle extends Item{

 

public wooden_pestle(){

 

super();

this.setMaxDamage(4);

this.setMaxStackSize(1);

 

}

 

@Override

public boolean hasContainerItem(ItemStack stack) {

return true;

}

 

@Override

public ItemStack getContainerItem(ItemStack itemStack) {

 

itemStack.setItemDamage(itemStack.getItemDamage() + 1);

return itemStack;

 

}

 

}

 

how i can register the recipe?