Allowing spiders to attack in daylight

Hello. I am trying to be able to spawn spiders that attack in daylight. I know this is possible, but I just don't know how to achieve this.

I currently have this, but I am pretty sure it's not going to work:

Code:

package me.HeyAwesomePeople.kitpvp.custommobs;

import me.HeyAwesomePeople.kitpvp.KitPVP;
import net.minecraft.server.v1_8_R2.EntitySpider;
import net.minecraft.server.v1_8_R2.GenericAttributes;
import net.minecraft.server.v1_8_R2.PathfinderGoalHurtByTarget;
import net.minecraft.server.v1_8_R2.World;

import org.bukkit.entity.Player;

public class AgroSpider extends EntitySpider {
    private KitPVP plugin = KitPVP.instance;
    private Player toIgnore;

    public AgroSpider(World world, Player p) {
        super(world);
        this.toIgnore = p;
      
        this.targetSelector.a(1, new PathfinderGoalHurtByTarget(this, true, new Class[0]));
    }

    @Override
    protected void initAttributes() {
        super.initAttributes();
        getAttributeInstance(GenericAttributes.maxHealth).setValue(20.0D);
    }



}

I'm new to NMS and still don't know how to use it properly. I also don't know how I am supposed to read method a() and find out what it does. Is there like a document or something somewhere I can go to figure out how do edit the NMS. It seems others do it easily.

Thanks,
HeyAwesomePeople

EDIT: Someone suggested I do this, with no NMS:

Code:

  @EventHandler
   public void onEvent(PlayerMoveEvent event) {
    
     for(Entity e : event.getPlayer().getNearbyEntities(15, 15, 15)) { //Replace '15' with the radius you want the spiders to attack you
      
       if(e instanceof Spider) {
        
         if(((Spider) e).getTarget() == null && event.getPlayer().getGameMode() != GameMode.CREATIVE && event.getPlayer().getGameMode() != GameMode.SPECTATOR) {
        
           ((Spider) e).setTarget(event.getPlayer());
        
         } else if(((Spider) e).getTarget() == event.getPlayer() && (event.getPlayer().getGameMode() == GameMode.CREATIVE || event.getPlayer().getGameMode() == GameMode.SPECTATOR)) {
          
           ((Spider) e).setTarget(null);
          
         }
          
       }
      
     }
    
   }

But I would think that would effect server performance if 100 people are online, constantly checking a 15 wide area for spiders?

 

@HeyAwesomePeople
Well, I think you shall do it the nms way.
1 important thing: You`re forgeting to register that entity.
And I think you should check if there`s any target Selectors that cancells entity targeting when it`s day, if there`s one, you should delete it.

 

@Juancomaster1998 I know I have to register the entity, but how do I know which selector controls whether or not the spider should attack in the daytime or not?