ExampleEntityListener.Java

package me.Adamki11s.Example;

import org.bukkit.entity.Entity;
import org.bukkit.entity.Player;
import org.bukkit.event.entity.EntityDamageEvent;
import org.bukkit.event.entity.EntityListener;

/* Example Template
 * By Adamki11s
 * HUGE Plugin Tutorial
 */

public class ExampleEntityListener extends EntityListener {

    public static Example plugin;

    public ExampleEntityListener(Example instance) {
        plugin = instance;
    }

    public void onEntityDamage(EntityDamageEvent event){

        if(event.getEntity() instanceof Player){
        //If the entity being damaged is a player then...

            event.setCancelled(true);
        //Cancel the damage event, this will give the player unlimited health
        }
    }

}