Good day. I have a problem! When I add the recipe to craft an instrument, it works well. But when I take a damaged tool from the crafting grid disappears

Is code of tool:

 

public class Mortar extends Item {

public Mortar(String name) {

super();

this.setCreativeTab(HighEnergetics.tabHEI);

this.setUnlocalizedName(name);

this.setMaxDamage( 27 );

this.setMaxStackSize( 1 );

}

 

@Override

public ItemStack getContainerItem(ItemStack itemStack )

{

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

return itemStack;

}

 

@Override

public boolean hasContainerItem(ItemStack stack)

{

return true;

}

 

}

 

And of recipe:

 

GameRegistry.addRecipe(new ItemStack(HEItems.copperDust), new Object[] {"MI", 'M', new ItemStack(HEItems.mortar, 1, OreDictionary.WILDCARD_VALUE), 'I', HEItems.copperIngot});

 

 

I want tool like hammer from IC²

And a few information. Then damaged tool is staing in crafting grid, It are the icon and the zero sub.

But, why? 

You tall about ItemStack copy() method?

That's the method.

 

Remember that you're working with pointers, so you don't want to operate on the input until the product is removed from the output slot. If you act on the original, you could damage it while the output dust is just sitting in the slot waiting to be grabbed (and if the grid is updated every tick, then that might be why your mortar disappeared).

I'm confused 

Sorry about that. We may have a language barrier.

 

Make a copy of the item stack using the object's copy method. Manipulate and return the copy.