Fix CraftLegacy warning and hopper task stopping on stack size change

core/src/main/java/github/nighter/smartspawner/extras/HopperHandler.java

@@ -180,6 +180,30 @@ public void stopHopperTask(Location hopperLoc) {
         }
     }
 
+    /**
+     * Restart hopper task for a spawner location.
+     * This is called when spawner stack size changes to ensure hopper continues working.
+     * @param spawnerLoc The location of the spawner
+     */
+    public void restartHopperForSpawner(Location spawnerLoc) {
+        if (!plugin.getConfig().getBoolean("hopper.enabled", false)) return;
+
+        // Find hopper below the spawner
+        Block spawnerBlock = spawnerLoc.getBlock();
+        if (spawnerBlock.getType() != Material.SPAWNER) return;
+
+        Block hopperBlock = spawnerBlock.getRelative(BlockFace.DOWN);
+        if (hopperBlock.getType() != Material.HOPPER) return;
+
+        Location hopperLoc = hopperBlock.getLocation();
+
+        // Stop existing hopper task if any
+        stopHopperTask(hopperLoc);
+
+        // Start new hopper task
+        startHopperTask(hopperLoc, spawnerLoc);
+    }
+
     private void transferItems(Location hopperLoc, Location spawnerLoc) {
         SpawnerData spawner = spawnerManager.getSpawnerByLocation(spawnerLoc);
         if (spawner == null) return;

core/src/main/java/github/nighter/smartspawner/spawner/gui/main/SpawnerMenuAction.java

@@ -10,7 +10,6 @@
 import github.nighter.smartspawner.spawner.gui.synchronization.SpawnerGuiViewManager;
 import github.nighter.smartspawner.spawner.properties.SpawnerData;
 import github.nighter.smartspawner.spawner.sell.SpawnerSellManager;
-import github.nighter.smartspawner.utils.DynamicMaterialDetector;
 import org.bukkit.Bukkit;
 import org.bukkit.Material;
 import org.bukkit.Particle;
@@ -32,8 +31,18 @@
 import java.util.concurrent.ConcurrentHashMap;
 
 public class SpawnerMenuAction implements Listener {
-    private static final Set<Material> SPAWNER_INFO_MATERIALS = 
-        DynamicMaterialDetector.getSpawnerInfoMaterials();
+    // Spawner info materials - manually defined to avoid Material.values() iteration
+    // which can trigger CraftLegacy initialization
+    private static final Set<Material> SPAWNER_INFO_MATERIALS = Set.of(
+        Material.PLAYER_HEAD,
+        Material.SPAWNER,
+        Material.ZOMBIE_HEAD,
+        Material.SKELETON_SKULL,
+        Material.WITHER_SKELETON_SKULL,
+        Material.CREEPER_HEAD,
+        Material.PIGLIN_HEAD,
+        Material.DRAGON_HEAD
+    );
     private final SmartSpawner plugin;
     private final SpawnerMenuUI spawnerMenuUI;
     private final SpawnerStackerUI spawnerStackerUI;

core/src/main/java/github/nighter/smartspawner/spawner/loot/EntityLootRegistry.java

@@ -54,6 +54,16 @@ public void loadConfigurations() {
                 continue;
             }
 
+            // Validate entity type exists in current version
+            EntityType entityType;
+            try {
+                entityType = EntityType.valueOf(entityName.toUpperCase());
+            } catch (IllegalArgumentException e) {
+                plugin.getLogger().warning("Entity type '" + entityName + "' is not available in server version " +
+                        plugin.getServer().getBukkitVersion() + " - skipping");
+                continue;
+            }
+
             ConfigurationSection entitySection = lootConfig.getConfigurationSection(entityName);
             if (entitySection == null) continue;
 

core/src/main/java/github/nighter/smartspawner/spawner/properties/SpawnerData.java

@@ -243,6 +243,12 @@ private void updateStackSize(int newStackSize) {
         if (plugin.getSpawnerMenuFormUI() != null) {
             plugin.getSpawnerMenuFormUI().invalidateSpawnerCache(this.spawnerId);
         }
+
+        // Restart hopper task if hopper integration is enabled
+        // This ensures hopper continues to work after stack size changes
+        if (plugin.getHopperHandler() != null) {
+            plugin.getHopperHandler().restartHopperForSpawner(this.spawnerLocation);
+        }
     }
 
     private void recreateVirtualInventory() {