Flings hostile mobs away from player on teleport.

src/main/java/world/bentobox/bentobox/Settings.java

@@ -147,6 +147,14 @@ public class Settings implements ConfigObject {
     @ConfigComment("Add other fake player names here if required")
     @ConfigEntry(path = "general.fakeplayers", experimental = true)
     private Set<String> fakePlayers = new HashSet<>();
+    
+    @ConfigComment("Flingback power. How far hostile mobs will be flung back when a player teleports into them.")
+    @ConfigEntry(path = "general.flingback")
+    private double flingback = 5D;
+    
+    @ConfigComment("Kill mobs on teleport. If thw world flag is set, then they will be killed/removed instead of flung.")
+    @ConfigEntry(path = "general.teleport-remove-mobs")
+    private boolean teleportRemoveMobs = false;    
 
     /* PANELS */
 
@@ -1038,4 +1046,32 @@ public class Settings implements ConfigObject {
     {
         this.safeSpotSearchRange = safeSpotSearchRange;
     }
+
+    /**
+     * @return the flingback
+     */
+    public double getFlingback() {
+        return flingback;
+    }
+
+    /**
+     * @param flingback the flingback to set
+     */
+    public void setFlingback(double flingback) {
+        this.flingback = flingback;
+    }
+
+    /**
+     * @return the teleportRemoveMobs
+     */
+    public boolean isTeleportRemoveMobs() {
+        return teleportRemoveMobs;
+    }
+
+    /**
+     * @param teleportRemoveMobs the teleportRemoveMobs to set
+     */
+    public void setTeleportRemoveMobs(boolean teleportRemoveMobs) {
+        this.teleportRemoveMobs = teleportRemoveMobs;
+    }
 }

src/main/java/world/bentobox/bentobox/managers/IslandsManager.java

@@ -13,6 +13,7 @@ import java.util.Map.Entry;
 import java.util.Objects;
 import java.util.Optional;
 import java.util.Queue;
+import java.util.Random;
 import java.util.Set;
 import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
@@ -20,25 +21,20 @@ import java.util.stream.Collectors;
 
 import org.bukkit.Bukkit;
 import org.bukkit.ChatColor;
-import org.bukkit.Color;
 import org.bukkit.Location;
 import org.bukkit.Material;
+import org.bukkit.Sound;
 import org.bukkit.World;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
-import org.bukkit.entity.AbstractArrow.PickupStatus;
-import org.bukkit.entity.Arrow;
 import org.bukkit.entity.Boat;
 import org.bukkit.entity.Boat.Type;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.LivingEntity;
 import org.bukkit.entity.Player;
 import org.bukkit.entity.PufferFish;
-import org.bukkit.entity.Zombie;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.permissions.PermissionAttachmentInfo;
-import org.bukkit.potion.PotionData;
-import org.bukkit.potion.PotionType;
 import org.bukkit.scheduler.BukkitRunnable;
 import org.bukkit.util.Vector;
 import org.eclipse.jdt.annotation.NonNull;
@@ -72,6 +68,7 @@ import world.bentobox.bentobox.util.teleport.SafeSpotTeleport;
 public class IslandsManager {
 
     private final BentoBox plugin;
+    private final Random rand = new Random();
 
     // Tree species to boat material map
     private static final Map<Type, Material> TREE_TO_BOAT = ImmutableMap.<Type, Material>builder().
@@ -1639,6 +1636,7 @@ public class IslandsManager {
      */
     public void clearArea(Location loc) {
         if (!plugin.getIWM().inWorld(loc)) return;
+        
         loc.getWorld().getNearbyEntities(loc, plugin.getSettings().getClearRadius(),
                 plugin.getSettings().getClearRadius(),
                 plugin.getSettings().getClearRadius()).stream()
@@ -1648,26 +1646,29 @@ public class IslandsManager {
                 && !(en instanceof PufferFish)
                 && ((LivingEntity)en).getRemoveWhenFarAway())
         .filter(en -> en.getCustomName() == null)
-        .forEach(e -> fireArrowOfPower(e, loc));
+        .forEach(e -> flingOrKill(e, loc));
     }
 
-    private void fireArrowOfPower(Entity e, Location loc) {
-        Vector direction = e.getLocation().toVector().subtract(loc.toVector()).normalize();
-        if (e instanceof Zombie z) {
-            plugin.logDebug("Health = " + z.getHealth() + " direction " + direction);
+    private void flingOrKill(Entity e, Location loc) {
+        if (plugin.getSettings().isTeleportRemoveMobs()) {
+            e.remove();
+            return;
         }
-
-        Arrow arrow = loc.getWorld().spawnArrow(loc, direction, 0.7F, 0);
-        arrow.setDamage(0);
-        arrow.setPierceLevel(0);
-        PotionData pd = new PotionData(PotionType.INSTANT_HEAL, false, false);
-        arrow.setBasePotionData(pd);
-        arrow.setCritical(false);
-        arrow.setKnockbackStrength(50);
-        Color color = Color.AQUA;
-        //color.setAlpha(0);
-        arrow.setColor(color);
-        arrow.setPickupStatus(PickupStatus.DISALLOWED);
+        Vector entVec = e.getLocation().toVector();
+        double dist = plugin.getSettings().getFlingback() - entVec.distance(loc.toVector());
+        if (dist < 1) {
+            dist = 1;
+        }
+        Vector direction = entVec.subtract(loc.toVector());
+        if (direction.lengthSquared() < 3) {
+            // On top of us
+            direction.add(new Vector(rand.nextDouble(), 0, rand.nextDouble())); 
+        }
+        // Add a bit of lift
+        direction.add(new Vector(0, rand.nextDouble(), 0)); 
+        direction.multiply(dist);
+        loc.getWorld().playSound(e, Sound.ENTITY_ILLUSIONER_HURT, 1F, 5F);
+        e.setVelocity(direction);
     }
 
     /**

src/main/resources/config.yml

@@ -82,8 +82,8 @@ general:
     prefix-character: ''
     # Custom connection datasource properties that will be applied to connection pool.
     # Check available values to your SQL driver implementation.
-    # Example: ")
-    #   custom-properties:
+    # Example: 
+    #   custom-properties: 
     #     cachePrepStmts: 'true'
     #     prepStmtCacheSize: '250'
     #     prepStmtCacheSqlLimit: '2048'
@@ -98,6 +98,10 @@ general:
   # /!\ This feature is experimental and might not work as expected or might not work at all.
   fakeplayers:
   - '[CoFH]'
+  # Flingback power. How far hostile mobs will be flung back when a player teleports into them.
+  flingback: 5.0
+  # Remove mobs on teleport.
+  teleport-remove-mobs: false
 panel:
   # Toggle whether panels should be closed or not when the player clicks anywhere outside of the inventory view.
   close-on-click-outside: true