Throw PlayerLevelChangeEvent and PlayerExpChangeEvent events. Thanks to feildmaster for the PR.

src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java

@@ -391,4 +391,17 @@ public class CraftEventFactory {
 
         return event;
     }
+
+    public static PlayerLevelChangeEvent callPlayerLevelChangeEvent(Player player, int oldLevel, int newLevel) {
+        PlayerLevelChangeEvent event = new PlayerLevelChangeEvent(player, oldLevel, newLevel);
+        Bukkit.getPluginManager().callEvent(event);
+        return event;
+    }
+
+    public static PlayerExpChangeEvent callPlayerExpChangeEvent(EntityHuman entity, int expAmount) {
+        Player player = (Player) entity.getBukkitEntity();
+        PlayerExpChangeEvent event = new PlayerExpChangeEvent(player, expAmount);
+        Bukkit.getPluginManager().callEvent(event);
+        return event;
+    }
 }