Mod for taming doesnt work.

This is for advanced Minecraft Java mod makers. So i have this script: 

import net.minecraft.entity.monster.SkeletonEntity;
import net.minecraft.item.Items;
import net.minecraft.item.EnchantedGoldenAppleItem;
import net.minecraft.item.ItemStack;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.util.Hand;
import net.minecraftforge.event.entity.living.LivingAttackEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;

public class Example {
    @SubscribeEvent
    public void tameSkeleton(PlayerInteractEvent.EntityInteract event) {
        if (event.getTarget() instanceof SkeletonEntity) {
            SkeletonEntity skeleton = (SkeletonEntity) event.getTarget();
            ItemStack itemstack = event.getPlayer().getHeldItem(event.getHand());
            if (skeleton.isTamed()) {
                return;
            } else if (itemstack.getItem() instanceof EnchantedGoldenAppleItem) {
                if (!event.getPlayer().abilities.isCreativeMode) {
                    itemstack.shrink(1);
                }
                if (!skeleton.world.isRemote) {
                    skeleton.setTamedBy(event.getPlayer());
                    skeleton.world.setEntityState(skeleton, (byte)7);
                }
                return;
            }
        }
    }
    @SubscribeEvent
    public void skeletonDefendPlayer(LivingAttackEvent event) {
        if (event.getEntity() instanceof PlayerEntity) {
            PlayerEntity player = (PlayerEntity) event.getEntity();
            if (player.getAttackingEntity() instanceof SkeletonEntity) {
                SkeletonEntity skeleton = (SkeletonEntity) player.getAttackingEntity();
                if (skeleton.isTamed()) {
                    event.setCanceled(true);
                    skeleton.setAttackTarget(event.getSource().getTrueSource());
                }
            }
        }
    }
}
 

and it should make skeleton posible to tame. Apps that im using to create mods doesnt show any errors so why it doesnt work?