kinda ugly but it works

inventory saving: complete

src/main/java/me/totalfreedom/totalfreedommod/config/ConfigInventory.java

@@ -0,0 +1,73 @@
+package me.totalfreedom.totalfreedommod.config;
+
+import java.util.HashMap;
+import java.util.Map;
+import lombok.Getter;
+import lombok.Setter;
+import org.bukkit.Material;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.craftbukkit.v1_14_R1.inventory.CraftItemStack;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.ItemStack;
+
+public class ConfigInventory
+{
+    @Getter
+    @Setter
+    private Map<Integer, ItemStack> inventoryItems;
+
+    public ConfigInventory(Inventory inv)
+    {
+        updateInventory(inv);
+    }
+
+    public void set(int location, ItemStack stack)
+    {
+        inventoryItems.put(location, stack);
+    }
+
+    public ItemStack get(int location)
+    {
+        return inventoryItems.get(location);
+    }
+
+    public boolean hasNBT(int location)
+    {
+        return CraftItemStack.asNMSCopy(inventoryItems.get(location)).hasTag();
+    }
+
+    public String getNBT(int location)
+    {
+        return CraftItemStack.asNMSCopy(inventoryItems.get(location)).getTag().toString();
+    }
+
+    public void updateInventory(Inventory inv)
+    {
+        inventoryItems = new HashMap<>();
+        for (int i = 0; i < inv.getSize(); i++)
+        {
+            inventoryItems.put(i, inv.getItem(i));
+        }
+    }
+
+    public void save(ConfigurationSection cs)
+    {
+        for (int i = 0; i < inventoryItems.size(); i++)
+        {
+            ItemStack currentStack = inventoryItems.get(i);
+            net.minecraft.server.v1_14_R1.ItemStack nmsStack = CraftItemStack.asNMSCopy(currentStack);
+            if (currentStack == null)
+            {
+                ItemStack air = new ItemStack(Material.AIR, 1);
+                inventoryItems.put(i, air);
+                currentStack = air;
+            }
+            cs.set("inventory." + i + ".type", currentStack.getType().name());
+            cs.set("inventory." + i + ".amount", currentStack.getAmount());
+            if (nmsStack.hasTag())
+            {
+                cs.set("inventory." + i + ".nbt", nmsStack.getTag().toString());
+            }
+        }
+    }
+}