Fix for handling damage event for invincible effect

src/main/java/me/SuperRonanCraft/BetterRTP/player/events/Damage.java

@@ -0,0 +1,27 @@
+package me.SuperRonanCraft.BetterRTP.player.events;
+
+import me.SuperRonanCraft.BetterRTP.references.player.HelperPlayer;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.event.entity.EntityDamageEvent;
+
+public class Damage {
+    static boolean canCancel(EntityDamageEvent.DamageCause damageCause) {
+        return true; // TODO: Allow for filtering damage causes
+    }
+
+    static boolean isInInvincibleMode(Player player) {
+        return HelperPlayer.getData(player).getInvincibleEndTime() > System.currentTimeMillis();
+    }
+
+    static void onEntityDamage(EntityDamageEvent event) {
+        Entity entity = event.getEntity();
+        if (!(entity instanceof Player)) return;
+        Player player = (Player) entity;
+
+        if (!canCancel(event.getCause())) return;
+        if (!isInInvincibleMode(player)) return;
+
+        event.setCancelled(true);
+    }
+}

src/main/java/me/SuperRonanCraft/BetterRTP/player/events/EventListener.java

@@ -5,6 +5,7 @@
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
 import org.bukkit.event.block.SignChangeEvent;
+import org.bukkit.event.entity.EntityDamageEvent;
 import org.bukkit.event.inventory.InventoryClickEvent;
 import org.bukkit.event.player.*;
 import org.bukkit.event.world.WorldLoadEvent;
@@ -67,4 +68,9 @@ private void worldLoad(WorldLoadEvent e) {
     private void onRespawn(PlayerRespawnEvent e) {
         Death.respawnEvent(e);
     }
+
+    @EventHandler
+    private void onDamage(EntityDamageEvent e) {
+        Damage.onEntityDamage(e);
+    }
 }

src/main/java/me/SuperRonanCraft/BetterRTP/player/rtp/effects/RTPEffect_Potions.java

@@ -2,6 +2,7 @@
 
 import me.SuperRonanCraft.BetterRTP.BetterRTP;
 import me.SuperRonanCraft.BetterRTP.references.file.FileOther;
+import me.SuperRonanCraft.BetterRTP.references.player.HelperPlayer;
 import me.SuperRonanCraft.BetterRTP.versions.AsyncHandler;
 import org.bukkit.entity.Player;
 import org.bukkit.potion.PotionEffect;
@@ -52,7 +53,7 @@ void load() {
     public void giveEffects(Player p) {
         AsyncHandler.syncAtEntity(p, () -> {
             if (invincibleEnabled)
-                p.setNoDamageTicks(invincibleTime * 20);
+                HelperPlayer.getData(p).setInvincibleEndTime(System.currentTimeMillis() + (invincibleTime * 1000L));
             if (potionEnabled) {
                 List<PotionEffect> effects = new ArrayList<>();
                 for (PotionEffectType e : potionEffects.keySet()) {

src/main/java/me/SuperRonanCraft/BetterRTP/references/player/playerdata/PlayerData.java

@@ -22,6 +22,7 @@ public class PlayerData {
     @Getter @Setter boolean rtping;
     @Getter @Setter int rtpCount;
     @Getter @Setter long globalCooldown;
+    @Getter @Setter long invincibleEndTime;
 
     PlayerData(Player player) {
         this.player = player;