StackSize porting mod error 1.12.2

[richie995 0]

I'm porting mob properties from 1.10.2 to 1.12.2 in eclipse and I've received the following error 

Spoiler

 

 

 

Spoiler

private int removeDrop(final Item item, final int damage, int count, final boolean infinite, final List<EntityItem> drops) {
        final Iterator<EntityItem> iterator = drops.iterator();
        while (iterator.hasNext()) {
            final EntityItem drop = iterator.next();
            final ItemStack dropStack = drop.getItem();
            if (item == dropStack.getItem() && (damage < 0 || damage == dropStack.getItemDamage())) {
                if (infinite) {
                    iterator.remove();
                }
                else {
                    count += dropStack.stackSize;
                    if (count < 0) {
                        iterator.remove();
                    }
                    else {
                        if (count == 0) {
                            iterator.remove();
                            return 0;
                        }
                        dropStack.stackSize = count;
                        drop.setEntityItemStack(dropStack);
                        return 0;

I'm relatively new to porting mod, so I'm unsure of what to do. The bolded functions are ones highlighted in red in eclipse. For the error "setEntityItemStack" when hovered over it says "The method setEntityItemStack(ItemStack) is undefined for the type EntityItem" and when hovering over "stacksize" it says "The field ItemStack.stackSize is not visible" I'm unsure of how to fix this error, and could use some help

[diesieben07 7368]

To get the size of an ItemStack use getCount. To modify it use setCount, grow and shrink.

To set the ItemStack of an EntityItem use setItem.

 

In the future please use your IDE to look at the code, these things are very easy to find.