How to make an entity undeadable?

Hi there,
I want to protect my custom entity but everyone can kill it. I tried to loop setting health to max, I tried to protect it with events but it could still die.
How to protect it? Or is there any method which makes the entity undeadable?​

 

@Michał Kolo Use EntityDamageEvent and its sub-classes.

 

@Michał Kolo you can show your code here or not..? would help by seeing it was you extaclty doing..

 

@PeterXonwiiXx Sure, this is the Main:

Code:

package me.doge.tutorial.core;

import static org.bukkit.ChatColor.BOLD;
import static org.bukkit.ChatColor.GREEN;

import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.entity.Entity;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.entity.EntityDamageByEntityEvent;
import org.bukkit.event.entity.EntityDamageEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.java.JavaPlugin;

import net.minecraft.server.v1_8_R3.EntityVillager;

public class Main extends JavaPlugin implements Listener {

    public static ItemStack NPC;

    @Override
    public void onEnable() {
        NMSUtil nmsu = new NMSUtil();
        Bukkit.getPluginManager().registerEvents(this, this);
        nmsu.registerEntity("TUTORIAL", 120, EntityVillager.class, CustomEntityNPC.class);
        NPC = new ItemStack(Material.MONSTER_EGG, 1, (short) 120);
        ItemMeta npcMeta = NPC.getItemMeta();
        npcMeta.setDisplayName(GREEN + "" + BOLD + "TUTORIAL");
        NPC.setItemMeta(npcMeta);
    }

    @EventHandler
    public void onPlayerNPCSpawn(PlayerInteractEvent e) {
        if (e.getAction() == Action.RIGHT_CLICK_BLOCK) {
            if (e.getPlayer().getItemInHand() == NPC
                    && e.getPlayer().getItemInHand().getItemMeta().equals(NPC.getItemMeta())) {
                CustomEntityNPC.spawn(e.getPlayer().getLocation());
            }
        }
    }

    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent e) {
        if (e.getPlayer().getDisplayName().equals("Doge3")) {
            e.getPlayer().getInventory().addItem(NPC);
        }
    }
}

CustomEntityNPC:

Code:

package me.doge.tutorial.core;

import java.lang.reflect.Field;
import java.util.List;

import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.craftbukkit.v1_8_R3.CraftWorld;
import org.bukkit.craftbukkit.v1_8_R3.entity.CraftLivingEntity;
import org.bukkit.entity.Villager;
import org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason;

import net.minecraft.server.v1_8_R3.EntityHuman;
import net.minecraft.server.v1_8_R3.EntityVillager;
import net.minecraft.server.v1_8_R3.GenericAttributes;
import net.minecraft.server.v1_8_R3.PathfinderGoalHurtByTarget;
import net.minecraft.server.v1_8_R3.PathfinderGoalLookAtPlayer;
import net.minecraft.server.v1_8_R3.PathfinderGoalRandomLookaround;
import net.minecraft.server.v1_8_R3.PathfinderGoalRandomStroll;
import net.minecraft.server.v1_8_R3.PathfinderGoalSelector;
import net.minecraft.server.v1_8_R3.World;

public class CustomEntityNPC extends EntityVillager {
   



    @SuppressWarnings("rawtypes")
    public CustomEntityNPC(World world) {
        super(world);
       
       
        List goalB = (List)getPrivateField("b", PathfinderGoalSelector.class, goalSelector); goalB.clear();
        List goalC = (List)getPrivateField("c", PathfinderGoalSelector.class, goalSelector); goalC.clear();
        List targetB = (List)getPrivateField("b", PathfinderGoalSelector.class, targetSelector); targetB.clear();
        List targetC = (List)getPrivateField("c", PathfinderGoalSelector.class, targetSelector); targetC.clear();
       
        this.goalSelector.a(7, new PathfinderGoalRandomStroll(this, 0.0F));
        this.goalSelector.a(8, new PathfinderGoalLookAtPlayer(this, EntityHuman.class, 1000.0F));
        this.goalSelector.a(8, new PathfinderGoalRandomLookaround(this));
        this.targetSelector.a(1, new PathfinderGoalHurtByTarget(this, false));
       
       
    }
   
    @Override
    public void g(double d0, double d1, double d2) {
        return;
    }
   
    @SuppressWarnings("rawtypes")
    public static Object getPrivateField(String fieldName, Class clazz, Object object)
    {
        Field field;
        Object o = null;

        try
        {
            field = clazz.getDeclaredField(fieldName);

            field.setAccessible(true);

            o = field.get(object);
        }
        catch(NoSuchFieldException e)
        {
            e.printStackTrace();
        }
        catch(IllegalAccessException e)
        {
            e.printStackTrace();
        }

        return o;
    }

    protected void initAttributes() {
        super.initAttributes();
        this.getAttributeInstance(GenericAttributes.maxHealth).setValue(10.0D);
        this.getAttributeInstance(GenericAttributes.MOVEMENT_SPEED).setValue(0.0F);
        this.setCustomName(ChatColor.GREEN + "TUTORIAL");
        this.setCustomNameVisible(true);
    }
   

    public static Villager spawn(Location loc) {
        World mcWorld = ((CraftWorld) loc.getWorld()).getHandle();
        final CustomEntityNPC customEntity = new CustomEntityNPC(mcWorld);
        customEntity.setLocation(loc.getX(), loc.getY(), loc.getZ(), loc.getYaw(), loc.getPitch());
        ((CraftLivingEntity) customEntity.getBukkitEntity()).setRemoveWhenFarAway(false);
        mcWorld.addEntity(customEntity, SpawnReason.CUSTOM);
        return (Villager) customEntity.getBukkitEntity();
    }
}

NMSUtil:

Code:

package me.doge.tutorial.core;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import net.minecraft.server.v1_8_R3.EntityInsentient;
import net.minecraft.server.v1_8_R3.EntityTypes;

public class NMSUtil {

    public void registerEntity(String name, int id, Class<? extends EntityInsentient> nmsClass,
            Class<? extends EntityInsentient> customClass) {
        try {
            List<Map<?, ?>> dataMap = new ArrayList<Map<?, ?>>();

            for (Field f : EntityTypes.class.getDeclaredFields()) {

                if (f.getType().getSimpleName().equals(Map.class.getSimpleName())) {
                    f.setAccessible(true);
                    dataMap.add((Map<?, ?>) f.get(null));
                }

            }

            if (dataMap.get(2).containsKey(id)) {
                dataMap.get(0).remove(name);
                dataMap.get(2).remove(id);
            }
            Method method = EntityTypes.class.getDeclaredMethod("a", Class.class, String.class, int.class);
            method.setAccessible(true);
            method.invoke(null, customClass, name, id);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

 

I don't see anywhere there that you're tracking EntityDamageEvent

 

I do think it's possible to do it with NMS as well. But seeing as I rarely touch NMS and I haven't done any custom mobs at all, I can't help.

 

@teej107
It's doable
I have a custom mobs plugin that I've been working on (think DiabloMobs for forge, but with CustomAI aswell), and it handles just fine with EventHandling

 

That wasn't my point. I was saying that there may be a way to do it with a custom mob without listening for events.

 

@teej107
Ah, I thought he was intending to do it with EventHandlers

Well the easiest way to do this is just to give it resistance 5 for a sufficiently long time
Otherwise you have to play with its NBT tags:
https://bukkit.org/threads/entity-nbt-tags.358267/

 

The way i normally do it, is just test for the NPC. You can do this by looking for it's custom name and entity type, which should narrow it down to 1/2 entities (depending if you give multiple ones the same name)

Try listening to EntityDamageEvent, and then testing if e.getEntity() instanceof CustomEntityNPC and then checking to see if it has a custom display name visible, if so is the name "Stuart"? if so, cancel the event.