Suppressed most fixable warning.

src/main/java/xyz/alexcrea/cuanvil/gui/config/MainConfigGui.java

@@ -41,6 +41,7 @@ public class MainConfigGui extends ChestGui {
         // Basic config item
         ItemStack basicConfigItemstack = new ItemStack(Material.COMMAND_BLOCK);
         ItemMeta basicConfigMeta = basicConfigItemstack.getItemMeta();
+        assert basicConfigMeta != null;
 
         basicConfigMeta.setDisplayName("\u00A7aBasic Config Menu");
         basicConfigMeta.setLore(Collections.singletonList("\u00A77Click here to open basic config menu"));
@@ -52,6 +53,7 @@ public class MainConfigGui extends ChestGui {
         // enchant level limit item
         ItemStack enchantLimitItemstack = new ItemStack(Material.ENCHANTED_BOOK);
         ItemMeta enchantLimitMeta = enchantLimitItemstack.getItemMeta();
+        assert enchantLimitMeta != null;
 
         enchantLimitMeta.setDisplayName("\u00A7aEnchantment Level Limit");
         enchantLimitMeta.setLore(Collections.singletonList("\u00A77Click here to open enchantment level limit menu"));
@@ -63,6 +65,7 @@ public class MainConfigGui extends ChestGui {
         // enchant cost item
         ItemStack enchantCostItemstack = new ItemStack(Material.EXPERIENCE_BOTTLE);
         ItemMeta enchantCostMeta = enchantCostItemstack.getItemMeta();
+        assert enchantCostMeta != null;
 
         enchantCostMeta.setDisplayName("\u00A7aEnchantment Cost");
         enchantCostMeta.setLore(Collections.singletonList("\u00A77Click here to open enchantment costs menu"));
@@ -72,20 +75,22 @@ public class MainConfigGui extends ChestGui {
         pane.bindItem('3', enchantCostItem);
 
         // Enchantment Conflicts item
-        ItemStack EnchantConflictItemstack = new ItemStack(Material.OAK_FENCE);
+        ItemStack enchantConflictItemstack = new ItemStack(Material.OAK_FENCE);
-        ItemMeta enchantConflictMeta = EnchantConflictItemstack.getItemMeta();
+        ItemMeta enchantConflictMeta = enchantConflictItemstack.getItemMeta();
+        assert enchantConflictMeta != null;
 
         enchantConflictMeta.setDisplayName("\u00A7aEnchantment Conflict");
         enchantConflictMeta.setLore(Collections.singletonList("\u00A77Click here to open enchantment conflict menu"));
-        EnchantConflictItemstack.setItemMeta(enchantConflictMeta);
+        enchantConflictItemstack.setItemMeta(enchantConflictMeta);
 
-        GuiItem enchantConflictItem = GuiGlobalItems.goToGuiItem(EnchantConflictItemstack, EnchantConflictGui.INSTANCE);
+        GuiItem enchantConflictItem = GuiGlobalItems.goToGuiItem(enchantConflictItemstack, EnchantConflictGui.INSTANCE);
         pane.bindItem('4', enchantConflictItem);
 
         // Group config items
         ItemStack groupItemstack = new ItemStack(Material.CHEST);
-
         ItemMeta groupMeta = groupItemstack.getItemMeta();
+        assert groupMeta != null;
+
         groupMeta.setDisplayName("\u00A7aGroups");
         groupMeta.setLore(Collections.singletonList("\u00A77Click here to open material group menu"));
         groupItemstack.setItemMeta(groupMeta);
@@ -97,6 +102,7 @@ public class MainConfigGui extends ChestGui {
         // Unit repair item
         ItemStack unirRepairItemstack = new ItemStack(Material.DIAMOND);
         ItemMeta unitRepairMeta = unirRepairItemstack.getItemMeta();
+        assert unitRepairMeta != null;
 
         unitRepairMeta.setDisplayName("\u00A7aUnit Repair");
         unitRepairMeta.setLore(Collections.singletonList("\u00A77Click here to open anvil unit repair menu"));
@@ -107,7 +113,8 @@ public class MainConfigGui extends ChestGui {
 
         // Custom recipe item
         ItemStack customRecipeItemstack = new ItemStack(Material.CRAFTING_TABLE);
-        ItemMeta customRecipeMeta = EnchantConflictItemstack.getItemMeta();
+        ItemMeta customRecipeMeta = customRecipeItemstack.getItemMeta();
+        assert customRecipeMeta != null;
 
         customRecipeMeta.setDisplayName("\u00A7aCustom recipes");
         customRecipeMeta.setLore(Collections.singletonList("\u00A77Click here to open anvil custom recipe menu"));
@@ -119,6 +126,8 @@ public class MainConfigGui extends ChestGui {
         // quit item
         ItemStack quitItemstack = new ItemStack(Material.BARRIER);
         ItemMeta quitMeta = quitItemstack.getItemMeta();
+        assert quitMeta != null;
+
         quitMeta.setDisplayName("\u00A7cQuit");
         quitItemstack.setItemMeta(quitMeta);
 
@@ -131,6 +140,7 @@ public class MainConfigGui extends ChestGui {
         // create & bind "info" item
         ItemStack infoItemstack = new ItemStack(Material.PAPER);
         ItemMeta infoMeta = infoItemstack.getItemMeta();
+        assert infoMeta != null;
 
         infoMeta.setDisplayName("\u00A7eThis is a alpha version of the gui !");
         infoMeta.setLore(Collections.singletonList("\u00A77If you have feedback or idea you can send them to the dev !"));

src/main/java/xyz/alexcrea/cuanvil/gui/config/SelectMaterialContainer.java

@@ -1,8 +1,6 @@
 package xyz.alexcrea.cuanvil.gui.config;
 
 import org.bukkit.Material;
-import xyz.alexcrea.cuanvil.group.AbstractMaterialGroup;
-import xyz.alexcrea.cuanvil.gui.config.list.elements.GroupConfigSubSettingGui;
 import xyz.alexcrea.cuanvil.util.CasedStringUtil;
 
 import java.util.*;

src/main/java/xyz/alexcrea/cuanvil/gui/config/global/BasicConfigGui.java

@@ -88,6 +88,7 @@ public class BasicConfigGui extends ValueUpdatableGui {
         // rename cost not needed
         ItemStack item = new ItemStack(Material.BARRIER);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
 
         meta.setDisplayName("\u00A7cRepair Cost Value");
         meta.setLore(Collections.singletonList("\u00A77Please, enable repair cost limit for this variable to be editable."));

src/main/java/xyz/alexcrea/cuanvil/gui/config/global/CustomRecipeConfigGui.java

@@ -41,6 +41,7 @@ public class CustomRecipeConfigGui extends MappedGuiListConfigGui<AnvilCustomRec
 
         // edit displayed item
         ItemMeta meta = displaydItem.getItemMeta();
+        assert meta != null;
 
         meta.setDisplayName("\u00A7e" + CasedStringUtil.snakeToUpperSpacedCase(recipe.toString()) + " \u00A7fCustom recipe");
         meta.addItemFlags(ItemFlag.values());
@@ -73,8 +74,8 @@ public class CustomRecipeConfigGui extends MappedGuiListConfigGui<AnvilCustomRec
         // Create new empty conflict and display it to the admin
         AnvilCustomRecipe recipe = new AnvilCustomRecipe(
                 name,
-                AnvilCustomRecipe.Companion.getDEFAULT_EXACT_COUNT_CONFIG(),
+                AnvilCustomRecipe.DEFAULT_EXACT_COUNT_CONFIG,
-                AnvilCustomRecipe.Companion.getDEFAULT_XP_COST_CONFIG(),
+                AnvilCustomRecipe.DEFAULT_XP_COST_CONFIG,
                 AnvilCustomRecipe.Companion.getDEFAULT_LEFT_ITEM_CONFIG(),
                 AnvilCustomRecipe.Companion.getDEFAULT_RIGHT_ITEM_CONFIG(),
                 AnvilCustomRecipe.Companion.getDEFAULT_RESULT_ITEM_CONFIG());

src/main/java/xyz/alexcrea/cuanvil/gui/config/global/EnchantConflictGui.java

@@ -58,6 +58,7 @@ public class EnchantConflictGui extends MappedGuiListConfigGui<EnchantConflictGr
         ItemStack item = new ItemStack(conflict.getRepresentativeMaterial());
 
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
 
         meta.addItemFlags(ItemFlag.values());
         meta.setDisplayName("\u00A7e" + CasedStringUtil.snakeToUpperSpacedCase(conflict.toString()) + " \u00A7fConflict");

src/main/java/xyz/alexcrea/cuanvil/gui/config/global/EnchantCostConfigGui.java

@@ -65,6 +65,7 @@ public class EnchantCostConfigGui extends AbstractEnchantConfigGui<EnchantCostSe
         // Create item
         ItemStack item = new ItemStack(Material.ENCHANTED_BOOK);
         ItemMeta itemMeta = item.getItemMeta();
+        assert itemMeta != null;
 
         // Edit name and lore
         itemMeta.setDisplayName(itemName);

src/main/java/xyz/alexcrea/cuanvil/gui/config/global/GroupConfigGui.java

@@ -34,6 +34,7 @@ public class GroupConfigGui extends MappedGuiListConfigGui<IncludeGroup, GroupCo
     protected ItemStack createItemForGeneric(IncludeGroup group) {
         ItemStack item = new ItemStack(group.getRepresentativeMaterial());
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
 
         meta.addItemFlags(ItemFlag.values());
         meta.setDisplayName("\u00A7e" + CasedStringUtil.snakeToUpperSpacedCase(group.getName())+ " \u00A7fGroup");

src/main/java/xyz/alexcrea/cuanvil/gui/config/global/UnitRepairConfigGui.java

@@ -48,6 +48,7 @@ public class UnitRepairConfigGui extends MappedGuiListConfigGui<Material, UnitRe
 
         ItemStack item = new ItemStack(material);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
 
         meta.setDisplayName("\u00A7eRepaired by " +materialName);
         meta.setLore(Arrays.asList(
@@ -78,6 +79,7 @@ public class UnitRepairConfigGui extends MappedGuiListConfigGui<Material, UnitRe
         // Create new conflict item
         ItemStack createItem = new ItemStack(Material.PAPER);
         ItemMeta createMeta = createItem.getItemMeta();
+        assert createMeta != null;
 
         createMeta.setDisplayName("\u00A7aSelect a new unit material");
         createMeta.setLore(Arrays.asList(

src/main/java/xyz/alexcrea/cuanvil/gui/config/list/MappedElementListConfigGui.java

@@ -27,6 +27,7 @@ public abstract class MappedElementListConfigGui< T, S > extends ElementListConf
         // Create new conflict item
         ItemStack createItem = new ItemStack(Material.PAPER);
         ItemMeta createMeta = createItem.getItemMeta();
+        assert createMeta != null;
 
         createMeta.setDisplayName("\u00A7aCreate new "+genericDisplayedName());
         createMeta.setLore(Arrays.asList(

src/main/java/xyz/alexcrea/cuanvil/gui/config/list/SettingGuiListConfigGui.java

@@ -27,6 +27,7 @@ public abstract class SettingGuiListConfigGui< T, S extends AbstractSettingGui.S
     protected GuiItem prepareCreateNewItem() {
         ItemStack createItem = new ItemStack(Material.PAPER);
         ItemMeta createMeta = createItem.getItemMeta();
+        assert createMeta != null;
 
         createMeta.setDisplayName(createItemName());
         createMeta.setLore(getCreateItemLore());

src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/CustomRecipeSubSettingGui.java

@@ -66,6 +66,7 @@ public class CustomRecipeSubSettingGui extends MappedToListSubSettingGui {
         // Delete item
         ItemStack deleteItem = new ItemStack(Material.RED_TERRACOTTA);
         ItemMeta deleteMeta = deleteItem.getItemMeta();
+        assert deleteMeta != null;
 
         deleteMeta.setDisplayName("\u00A74DELETE RECIPE");
         deleteMeta.setLore(Collections.singletonList("\u00A7cCaution with this button !"));
@@ -78,12 +79,12 @@ public class CustomRecipeSubSettingGui extends MappedToListSubSettingGui {
         IntRange costRange = AnvilCustomRecipe.Companion.getXP_COST_CONFIG_RANGE();
         this.exactCountFactory = BoolSettingsGui.boolFactory("\u00A78Exact count ?", this,
                 this.anvilRecipe + "." + AnvilCustomRecipe.EXACT_COUNT_CONFIG, ConfigHolder.CUSTOM_RECIPE_HOLDER,
-                AnvilCustomRecipe.Companion.getDEFAULT_EXACT_COUNT_CONFIG());
+                AnvilCustomRecipe.DEFAULT_EXACT_COUNT_CONFIG);
 
         this.xpCostFactory = IntSettingsGui.intFactory("\u00A78Recipe Xp Cost", this,
                 this.anvilRecipe +"."+AnvilCustomRecipe.XP_COST_CONFIG, ConfigHolder.CUSTOM_RECIPE_HOLDER,
                 null,
-                costRange.getFirst(), costRange.getLast(), AnvilCustomRecipe.Companion.getDEFAULT_XP_COST_CONFIG(), 1, 5, 10);
+                costRange.getFirst(), costRange.getLast(), AnvilCustomRecipe.DEFAULT_XP_COST_CONFIG, 1, 5, 10);
 
 
         this.leftItemFactory = ItemSettingGui.itemFactory("\u00A7eRecipe Left \u00A78Item", this,

src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/EnchantConflictSubSettingGui.java

@@ -70,6 +70,7 @@ public class EnchantConflictSubSettingGui extends MappedToListSubSettingGui impl
         // Delete item
         ItemStack deleteItem = new ItemStack(Material.RED_TERRACOTTA);
         ItemMeta deleteMeta = deleteItem.getItemMeta();
+        assert deleteMeta != null;
 
         deleteMeta.setDisplayName("\u00A74DELETE CONFLICT");
         deleteMeta.setLore(Collections.singletonList("\u00A7cCaution with this button !"));
@@ -186,6 +187,7 @@ public class EnchantConflictSubSettingGui extends MappedToListSubSettingGui impl
         // Configure enchant setting item
         ItemStack enchantItem = this.enchantSettingItem.getItem();
         ItemMeta enchantMeta = enchantItem.getItemMeta();
+        assert enchantMeta != null;
 
         enchantMeta.setDisplayName("\u00A7aSelect included \u00A75Enchantments \u00A7aSettings");
         enchantMeta.setLore(enchantLore);
@@ -197,6 +199,7 @@ public class EnchantConflictSubSettingGui extends MappedToListSubSettingGui impl
         // Configure group setting item
         ItemStack groupItem = this.groupSettingItem.getItem();
         ItemMeta groupMeta = groupItem.getItemMeta();
+        assert groupMeta != null;
 
         groupMeta.setDisplayName("\u00A7aSelect excluded \u00A73Groups \u00A7aSettings");
         groupMeta.setLore(groupLore);

src/main/java/xyz/alexcrea/cuanvil/gui/config/settings/BoolSettingsGui.java

@@ -64,6 +64,7 @@ public class BoolSettingsGui extends AbstractSettingGui {
     protected void prepareReturnToDefault() {
         ItemStack item = new ItemStack(Material.COMMAND_BLOCK);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
 
         meta.setDisplayName("\u00A7eReset to default value");
         meta.setLore(Collections.singletonList("\u00A77Default value is: " + holder.defaultVal));
@@ -95,6 +96,8 @@ public class BoolSettingsGui extends AbstractSettingGui {
 
         ItemStack valueItemStack = new ItemStack(displayedMat);
         ItemMeta valueMeta = valueItemStack.getItemMeta();
+        assert valueMeta != null;
+
         valueMeta.setDisplayName(displayedName);
         valueMeta.setLore(AbstractSettingGui.CLICK_LORE);
         valueItemStack.setItemMeta(valueMeta);

src/main/java/xyz/alexcrea/cuanvil/gui/config/settings/DoubleSettingGui.java

@@ -65,6 +65,7 @@ public class DoubleSettingGui extends AbstractSettingGui {
     private static final ItemStack DELETE_ITEM_STACK = new ItemStack(Material.RED_TERRACOTTA);
     static {
         ItemMeta meta = DELETE_ITEM_STACK.getItemMeta();
+        assert meta != null;
 
         meta.setDisplayName("\u00A7cDisable item being repaired ?");
         meta.setLore(Arrays.asList("\u00A77Confirm disabling unit repair for this item..",
@@ -117,6 +118,7 @@ public class DoubleSettingGui extends AbstractSettingGui {
     protected void prepareReturnToDefault() {
         ItemStack item = new ItemStack(Material.COMMAND_BLOCK);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
 
         meta.setDisplayName("\u00A7eReset to default value");
         meta.setLore(Collections.singletonList("\u00A77Default value is " + displayValue(holder.defaultVal)));
@@ -161,6 +163,8 @@ public class DoubleSettingGui extends AbstractSettingGui {
         // "result" display
         ItemStack resultPaper = new ItemStack(Material.PAPER);
         ItemMeta resultMeta = resultPaper.getItemMeta();
+        assert resultMeta != null;
+
         resultMeta.setDisplayName("\u00A7eValue: " + displayValue(now));
         resultPaper.setItemMeta(resultMeta);
         GuiItem resultItem = new GuiItem(resultPaper, GuiGlobalActions.stayInPlace, CustomAnvil.instance);
@@ -181,6 +185,8 @@ public class DoubleSettingGui extends AbstractSettingGui {
     private GuiItem getSetValueItem(Material mat, BigDecimal planned, String numberPrefix){
         ItemStack item = new ItemStack(mat);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
+
         meta.setDisplayName("\u00A7e" + displayValue(now) + " -> " + displayValue(planned)
                 + " \u00A7r(" + numberPrefix + (displayValue(planned.subtract(now).abs()) + "\u00A7r)"));
         meta.setLore(AbstractSettingGui.CLICK_LORE);
@@ -274,6 +280,7 @@ public class DoubleSettingGui extends AbstractSettingGui {
         // Create item stack then gui item
         ItemStack item = new ItemStack(stepMat);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
 
         meta.setDisplayName(stepName.toString());
         meta.setLore(stepLore);

src/main/java/xyz/alexcrea/cuanvil/gui/config/settings/EnchantCostSettingsGui.java

@@ -80,6 +80,7 @@ public class EnchantCostSettingsGui extends IntSettingsGui {
         // book display
         ItemStack bookItemstack = new ItemStack(Material.BOOK);
         ItemMeta bookMeta = bookItemstack.getItemMeta();
+        assert bookMeta != null;
 
         bookMeta.setDisplayName("\u00A7aCost of an Enchantment by Book");
         bookMeta.setLore(Arrays.asList(
@@ -90,8 +91,9 @@ public class EnchantCostSettingsGui extends IntSettingsGui {
         // sword display
         ItemStack swordItemstack = new ItemStack(Material.WOODEN_SWORD);
         ItemMeta swordMeta = swordItemstack.getItemMeta();
-        swordMeta.addItemFlags(ItemFlag.HIDE_ATTRIBUTES);
+        assert swordMeta != null;
 
+        swordMeta.addItemFlags(ItemFlag.values());
         swordMeta.setDisplayName("\u00A7aCost of an Enchantment by Item");
         swordMeta.setLore(Arrays.asList(
                 "\u00A77Cost per result item level of an sacrifice enchantment",
@@ -107,6 +109,7 @@ public class EnchantCostSettingsGui extends IntSettingsGui {
     protected void prepareReturnToDefault() {
         ItemStack item = new ItemStack(Material.COMMAND_BLOCK);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
 
         // assume holder is an instance of EnchantCostSettingFactory
         EnchantCostSettingFactory holder = (EnchantCostSettingFactory) this.holder;
@@ -141,6 +144,8 @@ public class EnchantCostSettingsGui extends IntSettingsGui {
             int planned = Math.max(holder.min, nowBook - step);
             ItemStack item = new ItemStack(Material.RED_TERRACOTTA);
             ItemMeta meta = item.getItemMeta();
+            assert meta != null;
+
             meta.setDisplayName("\u00A7e" + nowBook + " -> " + planned + " \u00A7r(\u00A7c-" + (nowBook - planned) + "\u00A7r)");
             meta.setLore(AbstractSettingGui.CLICK_LORE);
             item.setItemMeta(meta);
@@ -157,6 +162,8 @@ public class EnchantCostSettingsGui extends IntSettingsGui {
             int planned = Math.min(holder.max, nowBook + step);
             ItemStack item = new ItemStack(Material.GREEN_TERRACOTTA);
             ItemMeta meta = item.getItemMeta();
+            assert meta != null;
+
             meta.setDisplayName("\u00A7e" + nowBook + " -> " + planned + " \u00A7r(\u00A7a+" + (planned - nowBook) + "\u00A7r)");
             meta.setLore(AbstractSettingGui.CLICK_LORE);
             item.setItemMeta(meta);
@@ -170,8 +177,11 @@ public class EnchantCostSettingsGui extends IntSettingsGui {
         // "result" display
         ItemStack resultPaper = new ItemStack(Material.PAPER);
         ItemMeta resultMeta = resultPaper.getItemMeta();
+        assert resultMeta != null;
+
         resultMeta.setDisplayName("\u00A7eValue: " + nowBook);
         resultPaper.setItemMeta(resultMeta);
+
         GuiItem resultItem = new GuiItem(resultPaper, GuiGlobalActions.stayInPlace, CustomAnvil.instance);
 
         pane.bindItem('V', resultItem);

src/main/java/xyz/alexcrea/cuanvil/gui/config/settings/IntSettingsGui.java

@@ -69,6 +69,7 @@ public class IntSettingsGui extends AbstractSettingGui {
     protected void prepareReturnToDefault() {
         ItemStack item = new ItemStack(Material.COMMAND_BLOCK);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
 
         meta.setDisplayName("\u00A7eReset to default value");
         meta.setLore(Collections.singletonList("\u00A77Default value is: " + holder.defaultVal));
@@ -94,6 +95,8 @@ public class IntSettingsGui extends AbstractSettingGui {
             int planned = Math.max(holder.min, now - step);
             ItemStack item = new ItemStack(Material.RED_TERRACOTTA);
             ItemMeta meta = item.getItemMeta();
+            assert meta != null;
+
             meta.setDisplayName("\u00A7e" + now + " -> " + planned + " \u00A7r(\u00A7c-" + (now - planned) + "\u00A7r)");
             meta.setLore(AbstractSettingGui.CLICK_LORE);
             item.setItemMeta(meta);
@@ -111,6 +114,8 @@ public class IntSettingsGui extends AbstractSettingGui {
             int planned = Math.min(holder.max, now + step);
             ItemStack item = new ItemStack(Material.GREEN_TERRACOTTA);
             ItemMeta meta = item.getItemMeta();
+            assert meta != null;
+
             meta.setDisplayName("\u00A7e" + now + " -> " + planned + " \u00A7r(\u00A7a+" + (planned - now) + "\u00A7r)");
             meta.setLore(AbstractSettingGui.CLICK_LORE);
             item.setItemMeta(meta);
@@ -124,6 +129,8 @@ public class IntSettingsGui extends AbstractSettingGui {
         // "result" display
         ItemStack resultPaper = new ItemStack(Material.PAPER);
         ItemMeta resultMeta = resultPaper.getItemMeta();
+        assert resultMeta != null;
+
         resultMeta.setDisplayName("\u00A7eValue: " + now);
         resultPaper.setItemMeta(resultMeta);
         GuiItem resultItem = new GuiItem(resultPaper, GuiGlobalActions.stayInPlace, CustomAnvil.instance);
@@ -227,6 +234,7 @@ public class IntSettingsGui extends AbstractSettingGui {
         // Create item stack then gui item
         ItemStack item = new ItemStack(stepMat);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
 
         meta.setDisplayName(stepName.toString());
         meta.setLore(stepLore);

src/main/java/xyz/alexcrea/cuanvil/gui/config/settings/ItemSettingGui.java

@@ -74,6 +74,7 @@ public class ItemSettingGui extends AbstractSettingGui {
     protected void prepareReturnToDefault() {
         ItemStack item = new ItemStack(Material.COMMAND_BLOCK);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
 
         meta.setDisplayName("\u00A7eReset to default value");
         meta.setLore(Collections.singletonList("\u00A77Default value is: " + holder.defaultVal));
@@ -101,6 +102,7 @@ public class ItemSettingGui extends AbstractSettingGui {
         }else{
             displayedItem = new ItemStack(Material.BARRIER);
             ItemMeta valueMeta = displayedItem.getItemMeta();
+            assert valueMeta != null;
 
             valueMeta.setDisplayName("\u00A74NO ITEM SET");
             valueMeta.setLore(CLICK_LORE);
@@ -262,6 +264,8 @@ public class ItemSettingGui extends AbstractSettingGui {
                 item = item.clone();
             }
             ItemMeta meta = item.getItemMeta();
+            assert meta != null;
+
             meta.setDisplayName("\u00A7a" + name);
             meta.setLore(getDisplayLore());
 

src/main/java/xyz/alexcrea/cuanvil/gui/config/settings/MaterialSelectSettingGui.java

@@ -83,6 +83,7 @@ public class MaterialSelectSettingGui extends MappedElementListConfigGui<Materia
         // Select new mat item
         ItemStack selectItem = new ItemStack(Material.BLUE_STAINED_GLASS_PANE);
         ItemMeta selectMeta = selectItem.getItemMeta();
+        assert selectMeta != null;
 
         selectMeta.setDisplayName("\u00A7aAdd Item");
         selectMeta.setLore(Arrays.asList(
@@ -102,6 +103,7 @@ public class MaterialSelectSettingGui extends MappedElementListConfigGui<Materia
         // Instant Remove On item
         ItemStack instantRemoveOnItem = new ItemStack(Material.LIME_STAINED_GLASS_PANE);
         ItemMeta instantRemoveOnMeta = instantRemoveOnItem.getItemMeta();
+        assert instantRemoveOnMeta != null;
 
         instantRemoveOnMeta.setDisplayName("\u00A7eInstant remove is \u00A7aEnabled \u00A7e!");
         instantRemoveOnMeta.setLore(
@@ -112,6 +114,7 @@ public class MaterialSelectSettingGui extends MappedElementListConfigGui<Materia
         // Instant Remove Off item
         ItemStack instantRemoveOffItem = new ItemStack(Material.RED_STAINED_GLASS_PANE);
         ItemMeta instantRemoveOffMeta = instantRemoveOffItem.getItemMeta();
+        assert instantRemoveOffMeta != null;
 
         instantRemoveOffMeta.setDisplayName("\u00A7eInstant remove is \u00A7cDisabled \u00A7e!");
         instantRemoveOffMeta.setLore(
@@ -138,6 +141,7 @@ public class MaterialSelectSettingGui extends MappedElementListConfigGui<Materia
     private GuiItem prepareSaveItem() {
         ItemStack saveItemStack = new ItemStack(GuiGlobalItems.DEFAULT_SAVE_ITEM);
         ItemMeta saveMeta = saveItemStack.getItemMeta();
+        assert saveMeta != null;
 
         saveMeta.setDisplayName("\u00A7aSave");
 
@@ -153,7 +157,7 @@ public class MaterialSelectSettingGui extends MappedElementListConfigGui<Materia
                 player.sendMessage(GuiGlobalActions.NO_EDIT_PERM);
                 return;
             }
-            if(!testCanSave()) return;
+            if(testCantSave()) return;
 
 
             // Save setting
@@ -274,7 +278,7 @@ public class MaterialSelectSettingGui extends MappedElementListConfigGui<Materia
     }
 
     private void setSaveItem() {
-        if(!testCanSave()){
+        if(testCantSave()){
             this.backgroundPane.bindItem('S', this.noChangeItem);
         }else{
             this.backgroundPane.bindItem('S', this.saveItem);
@@ -282,8 +286,8 @@ public class MaterialSelectSettingGui extends MappedElementListConfigGui<Materia
 
     }
 
-    private boolean testCanSave() {
+    private boolean testCantSave() {
-        return this.defaultMaterialHash != this.nowMaterialHash;
+        return this.defaultMaterialHash == this.nowMaterialHash;
     }
 
 

src/main/java/xyz/alexcrea/cuanvil/gui/util/GuiGlobalItems.java

@@ -28,6 +28,8 @@ public class GuiGlobalItems {
     static {
         BACK_ITEM = new ItemStack(Material.BARRIER);
         ItemMeta meta = BACK_ITEM.getItemMeta();
+        assert meta != null;
+
         meta.setDisplayName("\u00A7cBack");
         BACK_ITEM.setItemMeta(meta);
     }
@@ -78,6 +80,8 @@ public class GuiGlobalItems {
     public static GuiItem backgroundItem(Material backgroundMat) {
         ItemStack item = new ItemStack(backgroundMat);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
+
         meta.setDisplayName("\u00A7c");
         item.setItemMeta(meta);
         return new GuiItem(item, GuiGlobalActions.stayInPlace, CustomAnvil.instance);
@@ -133,6 +137,8 @@ public class GuiGlobalItems {
 
         ItemStack item = new ItemStack(DEFAULT_SAVE_ITEM);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
+
         meta.setDisplayName("\u00A7aSave");
         item.setItemMeta(meta);
         return new GuiItem(item,
@@ -146,6 +152,8 @@ public class GuiGlobalItems {
     static {
         ItemStack item = new ItemStack(DEFAULT_NO_CHANGE_ITEM);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
+
         meta.setDisplayName("\u00A77No change. can't save.");
         item.setItemMeta(meta);
         NO_CHANGE_ITEM = new GuiItem(item, GuiGlobalActions.stayInPlace, CustomAnvil.instance);
@@ -205,6 +213,7 @@ public class GuiGlobalItems {
         // Create & initialise item
         ItemStack item = new ItemStack(itemMat);
         ItemMeta itemMeta = item.getItemMeta();
+        assert itemMeta != null;
 
         itemMeta.setDisplayName(itemName.toString());
         itemMeta.setLore(lore);
@@ -232,6 +241,7 @@ public class GuiGlobalItems {
     public static GuiItem temporaryCloseGuiToSelectItem(Material itemMaterial, Gui openBack){
         ItemStack item = new ItemStack(itemMaterial);
         ItemMeta meta = item.getItemMeta();
+        assert meta != null;
 
         meta.setDisplayName("\u00A7eTemporary close this menu");
         meta.setLore(Collections.singletonList("\u00A77Allow you to chose other item then return here."));

src/main/java/xyz/alexcrea/cuanvil/gui/util/GuiSharedConstant.java

@@ -60,18 +60,24 @@ public class GuiSharedConstant {
     static {
         CANCEL_ITEM = new ItemStack(Material.RED_TERRACOTTA);
         ItemMeta meta = CANCEL_ITEM.getItemMeta();
+        assert meta != null;
+
         meta.setDisplayName("\u00A7cCancel");
         meta.setLore(Collections.singletonList("\u00A77Cancel current action and return to previous menu."));
         CANCEL_ITEM.setItemMeta(meta);
 
         CONFIRM_ITEM = new ItemStack(Material.GREEN_TERRACOTTA);
         meta = CONFIRM_ITEM.getItemMeta();
+        assert meta != null;
+
         meta.setDisplayName("\u00A7aConfirm");
         meta.setLore(Collections.singletonList("\u00A77Confirm current action."));
         CONFIRM_ITEM.setItemMeta(meta);
 
         CONFIRM_PERMANENT_ITEM = new ItemStack(Material.GREEN_TERRACOTTA);
         meta = CONFIRM_PERMANENT_ITEM.getItemMeta();
+        assert meta != null;
+
         meta.setDisplayName("\u00A7aConfirm");
         meta.setLore(Arrays.asList("\u00A77Confirm current action.",
                 "\u00A74Cation: This action can't be canceled."));

src/main/kotlin/xyz/alexcrea/cuanvil/group/EnchantConflictManager.kt

@@ -82,7 +82,7 @@ class EnchantConflictManager {
         // Read and add enchantment to conflict
         val enchantList = section.getStringList(ENCH_LIST_PATH)
         for (enchantName in enchantList) {
-            val enchant = getEnchantByName(enchantName);
+            val enchant = getEnchantByName(enchantName)
             if (enchant == null) {
                 if (!futureUse) {
                     CustomAnvil.instance.logger.warning("Enchantment $enchantName do not exist but was asked for conflict $conflictName")
@@ -110,7 +110,7 @@ class EnchantConflictManager {
         }
 
         val enchantKey = NamespacedKey.minecraft(enchantName)
-        return Enchantment.getByKey(enchantKey);
+        return Enchantment.getByKey(enchantKey)
     }
 
 

src/main/kotlin/xyz/alexcrea/cuanvil/recipe/AnvilCustomRecipe.kt

@@ -32,20 +32,20 @@ class AnvilCustomRecipe(
         const val RESULT_ITEM_CONFIG = "result_item"
 
 
-        val DEFAULT_EXACT_COUNT_CONFIG = true
+        const val DEFAULT_EXACT_COUNT_CONFIG = true
         //val DEFAULT_EXACT_LEFT_CONFIG = true
         //val DEFAULT_EXACT_RIGHT_CONFIG = true
 
-        val DEFAULT_XP_COST_CONFIG = 1
+        const val DEFAULT_XP_COST_CONFIG = 1
 
         val DEFAULT_LEFT_ITEM_CONFIG: ItemStack? = null
         val DEFAULT_RIGHT_ITEM_CONFIG: ItemStack? = null
-        val DEFAULT_RESULT_ITEM_CONFIG: ItemStack? = null;
+        val DEFAULT_RESULT_ITEM_CONFIG: ItemStack? = null
 
         val XP_COST_CONFIG_RANGE = 0..255
 
         fun getFromConfig(name: String, configSection: ConfigurationSection?): AnvilCustomRecipe? {
-            if(configSection == null) return null;
+            if(configSection == null) return null
             return AnvilCustomRecipe(
                 name,
                 configSection.getBoolean(EXACT_COUNT_CONFIG, DEFAULT_EXACT_COUNT_CONFIG),
@@ -89,7 +89,7 @@ class AnvilCustomRecipe(
 
 
         if (GuiSharedConstant.TEMPORARY_DO_SAVE_TO_DISK_EVERY_CHANGE) {
-            ConfigHolder.CUSTOM_RECIPE_HOLDER.saveToDisk(GuiSharedConstant.TEMPORARY_DO_BACKUP_EVERY_SAVE);
+            ConfigHolder.CUSTOM_RECIPE_HOLDER.saveToDisk(GuiSharedConstant.TEMPORARY_DO_BACKUP_EVERY_SAVE)
         }
     }