Adding potion effects to mobs.

Hey,

I am developing a zombie survival type plugin, similar to the game 'Killing Floor' just for personal use, as a challenge, and I am stuck here.
I have been searching for a while but can't seem to get anything that works.
I am going to make it work so each wave is stronger, faster and with much more zombies, and I can't work out how to give speed (and take speed) or give strength (And take strength).
Currently I have this, which I thought would give the potion effect when a zombie spawns:

Code:

public void onZombieSpawn(CreatureSpawnEvent event){
        event.getEntity().addPotionEffect(new PotionEffect(PotionEffectType.SPEED,2147483647, 50));
    }

I thought this would make the zombie go, well, very fast, but it doesn't... It does nothing.
Sorry if this has been answered before, but I couldn't seem to find it.

Thanks for the help.

(Also, I am quite new to java and plugin development. So far I have gotten by with Google and these forums, but I am not that great with how to use code and such.)

 

@ Ryan Johnson
An entity can refer to non-living entities such as minecarts or paintings and those can’t be assigned potion effects. That’s why you have to convert the entities to LivingEntity before assigning.

Code:

public void onZombieSpawn(CreatureSpawnEvent event){
 
if (event.getEntity() instanceof LivingEntity)
 
((LivingEntity)event.getEntity()).addPotionEffect(new PotionEffect(PotionEffectType.SPEED,2147483647, 50));

 

Doesn't seem to work...
This is what I have:

Code:

public void onZombieSpawn(CreatureSpawnEvent event){
        if (event.getEntity() instanceof LivingEntity){           
            ((LivingEntity)event.getEntity()).addPotionEffect(new PotionEffect(PotionEffectType.SPEED,70000, 2));
        }
    }

I have been changing the numbers after 'SPEED'. As far as I am aware, what I have as '70000' is the duration, and what I have as '2' is strength?
If I have this wrong please correct me, if this isn't how to change the duration and the strength I may also need some help with that

 

Ryan Johnson
No, that's right. I'm not sure why it's not working. Maybe try adding this extra boolean to override other potioneffects.

Code:

 ((LivingEntity)event.getEntity()).addPotionEffect(new PotionEffect(PotionEffectType.SPEED,70000, 2), true);

 

Just tried this out. Should there potion bubbles coming off? If so, there isn't.

 

TheSmallBones
No. Bubbles are only for players, I think.

 

Just tried adding speed 4 and they went the same speed as normal. Then added damage increase 3 and still had same damage when they hit me. =/

 

1. Bubbles would still come out of the zombie, I have put a potion effect on a spider before and there were bubbles coming off of it so I don't see why a zombie should be any different
2. the getEntity method of a CreatureSpawnEvent returns a LivingEntity so there is no need to cast to a LivingEntity
3. Not all potion effects affect all mobs. I would suggest throwing a speed splash potion at a zombie to see if it speeds it up, if not then the potion probably doesn't work on zombies.

 

ok i did this to my plugin Wolves Elite and EVERY mob had speed...
help plz
[EDIT]
Plz help me make it so they have it 4ever

 

You can't do it forever (you can type a very long int like 1234567899999999999) and what you mean with every mob?

 

Now guys i know this is late, but this is how i managed to do it

Code:

public class Main extends JavaPlugin implements Listener{
 
    public void onEnable(){
    }
   
    public void spawnMOB(Player player){
        Creeper creeper = (Creeper) player.getLocation().getWorld().spawn(player.getLocation(), Creeper.class);
       
        creeper.setCustomName(ChatColor.AQUA + "PuffyCloud");
        creeper.setCustomNameVisible(true);
    }
   
    public void spawnMOB2(Player player){
        Zombie zombie = (Zombie) player.getLocation().getWorld().spawn(player.getLocation(), Creeper.class);
       
        zombie.setCustomName(ChatColor.AQUA + "EvilKnight");
        zombie.setCustomNameVisible(true);
        zombie.setBaby(true);
        zombie.getEquipment().setHelmet(new ItemStack(Material.GLASS));
        zombie.hasPotionEffect(PotionEffectType.INVISIBILITY);
        zombie.getEquipment().setChestplate(new ItemStack(Material.DIAMOND_CHESTPLATE));
    }
 
   
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] a) {
        if (cmd.getName().equalsIgnoreCase("Mobs")) {
            Player p = (Player) sender;
            spawnMOB(p);
        }
           
        if (cmd.getName().equalsIgnoreCase("Mobs2")) {
            Player player = (Player) sender;
            spawnMOB2(player);
        }
        return false;
    }
}

It might be wrong i am only just learning so lets see how i went thanks guys