Adding temporary entity invulnerability

Adding a moment of invulnerability for the entity so it doesn't take damage in the immediate teleport. Restores it to the state before (in case entity was already invulnerable, we don't want to make it vulnerable)

src/main/java/com/coollord22/otheranimalteleport/OATMethods.java

@@ -19,18 +19,26 @@ public static void teleportLeashedEnt(Entity ent, Location from, Location to, Pl
 
 		plugin.log.logInfo("Attempting to null the leash holder.", Verbosity.HIGHEST);
 		((LivingEntity) ent).setLeashHolder(null);
+
+		boolean invulnerable = ent.isInvulnerable();
 
 		new BukkitRunnable() {
 			@Override
 			public void run() {
-				plugin.log.logInfo("Protecting entity with damage resistance.", Verbosity.HIGHEST);
+				plugin.log.logInfo("Protecting entity with invulnerability and resistance.", Verbosity.HIGHEST);
+				ent.setInvulnerable(true);
 				((LivingEntity) ent).addPotionEffect(new PotionEffect(PotionEffectType.DAMAGE_RESISTANCE, 40, 5));
+
 				plugin.log.logInfo("Teleporting entity " + ent.getType() + " with ID: " + ent.getEntityId(), Verbosity.HIGH);
 				ent.teleport(to);
+
 				plugin.log.logInfo("Re-attaching leash holder as " + p.getName() + ".", Verbosity.HIGHEST);
 				((LivingEntity) ent).setLeashHolder(p);
+
 				if(plugin.toUseTickets) 
 					fromChunk.removePluginChunkTicket(plugin);
+
+				ent.setInvulnerable(invulnerable);
 			}
 		}.runTaskLater(plugin, 2);
 	}
@@ -40,16 +48,22 @@ public static void teleportEnt(Entity ent, Location from, Location to, Player p,
 		if(plugin.toUseTickets) 
 			fromChunk.addPluginChunkTicket(plugin);
 
+		boolean invulnerable = ent.isInvulnerable();
+
 		new BukkitRunnable() {
 			@Override
 			public void run() {
-				plugin.log.logInfo("Protecting entity with damage resistance.", Verbosity.HIGHEST);
+				plugin.log.logInfo("Protecting entity with invulnerability and resistance.", Verbosity.HIGHEST);
+				ent.setInvulnerable(true);
 				((LivingEntity) ent).addPotionEffect(new PotionEffect(PotionEffectType.DAMAGE_RESISTANCE, 40, 5));
+
 				plugin.log.logInfo("Teleporting entity" + ent.getType() + " with ID: " + ent.getEntityId(), Verbosity.HIGH);
 				ent.teleport(to);
 
 				if(plugin.toUseTickets) 
 					fromChunk.removePluginChunkTicket(plugin);
+
+				ent.setInvulnerable(invulnerable);
 			}
 		}.runTaskLater(plugin, 2);
 	}