EntitySkeleton: add item in hand, set max health

Hello, I want to create a custom Skeleton that has a name, more health and holds other custom items.
I can add a name and setHealth, but i can't setMaxHealth and also setting items and armor just won't work.

Thanks for helping, here is my code:

Code (Text):

Player p = (Player) sender;
            WorldServer world = ((CraftWorld)p.getWorld()).getHandle();
            Location loc = p.getLocation();

            if (args.length > 0) {
                if (args[0].equalsIgnoreCase("define")) {
                    //get worldedit selection
                    if (getWorldEdit().getSelection(p) == null) {
                        p.sendMessage(title + "Please select a region with WorldEdit");
                        return false;
                    }
                    s = getWorldEdit().getSelection(p);
                    Location min = s.getMinimumPoint();
                    Location max = s.getMaximumPoint();

                    //boss mob creation
                    EntitySkeleton boss = new EntitySkeleton(world);
                    boss.setHealth(400);
                    boss.setCustomName("§4§lDAFT BOSS");
                    boss.setCustomNameVisible(true);

                    ItemStack weapon = new ItemStack(Material.DIAMOND_SWORD);
                    weapon.setDurability((short) 0);
                    weapon.addEnchantment(Enchantment.DAMAGE_ALL, 5);
                    weapon.addUnsafeEnchantment(Enchantment.KNOCKBACK, 2);



                    boss.setLocation(max);
                    world.addEntity(boss);


                }

 

No there's no such thing as boss.setWeapon(weapon). And setHealth does not.. it's still on 20hp when i setHealth to 400...

 

I can do that, but i can't do anything with it. It needs something like (Damageable)boss i think but I have no clue how to implement this.