refactoring Managers

src/main/java/me/unurled/sacredrealms/sr/managers/Managers.java

@@ -1,5 +1,8 @@
 package me.unurled.sacredrealms.sr.managers;
 
+import static me.unurled.sacredrealms.sr.utils.Logger.error;
+
+import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
 import java.util.List;
 import me.unurled.sacredrealms.sr.SR;
@@ -20,18 +23,36 @@ public class Managers {
     managers = new ArrayList<>();
     // register managers here (like a new instance of them)
 
-    Bukkit.getScheduler()
+    register(
-        .runTaskLater(
+        List.of(
-            SR.getInstance(),
+            DataManager.class,
-            () -> {
+            PlayerManager.class,
-              new DataManager();
+            ItemManager.class,
-              new PlayerManager();
+            CombatManager.class,
-              new ItemManager();
+            CommandManager.class,
-              new CombatManager();
+            EntityManager.class,
-              new CommandManager();
+            ClientBuildManager.class));
-              new EntityManager();
+  }
-            },
+
-            10L);
+  private void register(List<Class<? extends Manager>> clazz) {
+    int i = 0;
+    for (Class<? extends Manager> c : clazz) {
+      Bukkit.getScheduler()
+          .runTaskLater(
+              SR.getInstance(),
+              () -> {
+                try {
+                  c.getDeclaredConstructor().newInstance();
+                } catch (InstantiationException
+                    | IllegalAccessException
+                    | InvocationTargetException
+                    | NoSuchMethodException e) {
+                  error("Failed to register manager: " + c.getSimpleName());
+                }
+              },
+              5L * i);
+      i++;
+    }
   }
 
   public void addManager(Manager manager) {