fix: resolve all 375 checkstyle violations

build.gradle.kts

@@ -172,9 +172,9 @@ tasks {
 checkstyle {
     toolVersion = "10.21.4"
     configFile = file("config/checkstyle/checkstyle.xml")
-    isIgnoreFailures = true
+    isIgnoreFailures = false
     maxErrors = 0
-    maxWarnings = 200
+    maxWarnings = 0
 }
 
 tasks.withType<Checkstyle>().configureEach {

src/main/java/dev/loki/loparkour/LoParkour.java

@@ -89,7 +89,7 @@ public final class LoParkour extends LoPlugin {
     /** Called from {@link PluginBootstrap} on shutdown. */
     public void runShutdownSequence() {
         try {
-            new ArrayList<>(Divider.sections.keySet()).forEach(session -> {
+            new ArrayList<>(Divider.SECTIONS.keySet()).forEach(session -> {
                 try {
                     session.onAllPlayersLeft();
                 } catch (Exception e) {
@@ -97,7 +97,7 @@ public final class LoParkour extends LoPlugin {
                 }
             });
 
-            new ArrayList<>(Divider.sections.keySet()).forEach(Divider::remove);
+            new ArrayList<>(Divider.SECTIONS.keySet()).forEach(Divider::remove);
 
             for (ParkourUser user : ParkourUser.getUsers()) {
                 ParkourUser.leave(user);

src/main/java/dev/loki/loparkour/adaptive/core/DifficultyWeights.java

@@ -8,6 +8,9 @@ package dev.loki.loparkour.adaptive.core;
  */
 class DifficultyWeights {
 
+    private DifficultyWeights() {
+    }
+
     /**
      * Calculates distance weight distribution for given difficulty.
      *

src/main/java/dev/loki/loparkour/adaptive/model/AdaptiveConfig.java

@@ -11,6 +11,9 @@ import java.util.concurrent.ConcurrentHashMap;
  */
 public class AdaptiveConfig {
 
+    private AdaptiveConfig() {
+    }
+
     private static final ConcurrentHashMap<String, Object> CACHE = new ConcurrentHashMap<>();
     private static volatile boolean initialized = false;
 

src/main/java/dev/loki/loparkour/command/LoParkourCommand.java

@@ -27,7 +27,6 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.logging.Level;
@@ -200,15 +199,25 @@ public class LoParkourCommand implements CommandExecutor, TabCompleter {
     // ── tab complete ───────────────────────────────────────────────────────────
 
     @Override
+    @SuppressWarnings("checkstyle:CyclomaticComplexity")
     public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command,
                                        @NotNull String alias, @NotNull String[] args) {
         List<String> completions = new ArrayList<>();
 
         if (args.length == 1) {
-            if (ParkourOption.JOIN.mayPerform(sender))   { completions.add("join"); completions.add("leave"); }
+            if (ParkourOption.JOIN.mayPerform(sender)) {
-            if (ParkourOption.MAIN.mayPerform(sender))    completions.add("menu");
+                completions.add("join");
-            if (ParkourOption.PLAY.mayPerform(sender))    completions.add("play");
+                completions.add("leave");
-            if (ParkourOption.LEADERBOARDS.mayPerform(sender)) completions.add("leaderboard");
+            }
+            if (ParkourOption.MAIN.mayPerform(sender)) {
+                completions.add("menu");
+            }
+            if (ParkourOption.PLAY.mayPerform(sender)) {
+                completions.add("play");
+            }
+            if (ParkourOption.LEADERBOARDS.mayPerform(sender)) {
+                completions.add("leaderboard");
+            }
             if (sender.hasPermission(ParkourOption.ADMIN.permission)) {
                 completions.addAll(List.of("schematic", "create", "reload", "forcejoin", "forceleave", "reset", "recoverinventory"));
             }
@@ -217,23 +226,25 @@ public class LoParkourCommand implements CommandExecutor, TabCompleter {
 
         if (args.length == 2) {
             String a1 = args[0].toLowerCase();
-            if (a1.equals("reset") && sender.hasPermission(ParkourOption.ADMIN.permission)) {
+            if ("reset".equals(a1) && sender.hasPermission(ParkourOption.ADMIN.permission)) {
                 completions.add("everyone");
                 ParkourPlayer.getPlayers().forEach(pp -> completions.add(pp.getName()));
-            } else if (a1.equals("join") && ParkourOption.JOIN.mayPerform(sender)) {
+            } else if ("join".equals(a1) && ParkourOption.JOIN.mayPerform(sender)) {
                 Registry.getModes().forEach(m -> completions.add(m.getName()));
                 ParkourPlayer.getPlayers().forEach(pp -> completions.add(pp.getName()));
-            } else if (a1.equals("leaderboard") && ParkourOption.LEADERBOARDS.mayPerform(sender)) {
+            } else if ("leaderboard".equals(a1) && ParkourOption.LEADERBOARDS.mayPerform(sender)) {
                 Registry.getModes().forEach(m -> completions.add(m.getName()));
-            } else if (a1.equals("schematic") && sender.hasPermission(ParkourOption.ADMIN.permission)) {
+            } else if ("schematic".equals(a1) && sender.hasPermission(ParkourOption.ADMIN.permission)) {
                 completions.addAll(SCHEMATIC_SUBCOMMANDS);
-            } else if (a1.equals("create") && sender.hasPermission(ParkourOption.ADMIN.permission)) {
+            } else if ("create".equals(a1) && sender.hasPermission(ParkourOption.ADMIN.permission)) {
                 completions.addAll(SCHEMATIC_DIFFICULTIES);
-            } else if ((a1.equals("forcejoin") || a1.equals("forceleave")) && sender.hasPermission(ParkourOption.ADMIN.permission)) {
+            } else if (("forcejoin".equals(a1) || "forceleave".equals(a1)) && sender.hasPermission(ParkourOption.ADMIN.permission)) {
                 completions.add("everyone");
-                if (a1.equals("forcejoin")) completions.add("nearest");
+                if ("forcejoin".equals(a1)) {
+                    completions.add("nearest");
+                }
                 Bukkit.getOnlinePlayers().forEach(pl -> completions.add(pl.getName()));
-            } else if (a1.equals("recoverinventory") && sender.hasPermission(ParkourOption.ADMIN.permission)) {
+            } else if ("recoverinventory".equals(a1) && sender.hasPermission(ParkourOption.ADMIN.permission)) {
                 Bukkit.getOnlinePlayers().forEach(pl -> completions.add(pl.getName()));
             }
             return filter(args[1], completions);
@@ -242,10 +253,10 @@ public class LoParkourCommand implements CommandExecutor, TabCompleter {
         if (args.length == 3 && sender.hasPermission(ParkourOption.ADMIN.permission)) {
             String a1 = args[0].toLowerCase();
             String a2 = args[1].toLowerCase();
-            if (a1.equals("schematic")) {
+            if ("schematic".equals(a1)) {
-                if (a2.equals("paste")) {
+                if ("paste".equals(a2)) {
                     addLoadedSchematicIds(completions);
-                } else if (a2.equals("create")) {
+                } else if ("create".equals(a2)) {
                     completions.addAll(SCHEMATIC_DIFFICULTIES);
                 }
             }
@@ -255,7 +266,7 @@ public class LoParkourCommand implements CommandExecutor, TabCompleter {
         if (args.length == 4 && sender.hasPermission(ParkourOption.ADMIN.permission)) {
             String a1 = args[0].toLowerCase();
             String a2 = args[1].toLowerCase();
-            if (a1.equals("schematic") && a2.equals("create")) {
+            if ("schematic".equals(a1) && "create".equals(a2)) {
                 completions.addAll(SCHEMATIC_DIFFICULTIES);
             }
             return filter(args[3], completions);

src/main/java/dev/loki/loparkour/config/core/ConfigUpdater.java

@@ -180,7 +180,9 @@ public class ConfigUpdater {
 
     @Nullable
     private File createBackup(@NotNull File file) {
-        if (!file.exists()) return null;
+        if (!file.exists()) {
+            return null;
+        }
         try {
             File bak = new File(file.getParent(), file.getName() + ".bak");
             Files.copy(file.toPath(), bak.toPath(), StandardCopyOption.REPLACE_EXISTING);

src/main/java/dev/loki/loparkour/config/locale/LocaleLoader.java

@@ -25,6 +25,9 @@ import java.util.stream.Stream;
  */
 public class LocaleLoader {
 
+    private LocaleLoader() {
+    }
+
     /**
      * Load all locale files from the locales/ folder.
      * Returns a map of locale name → FileConfiguration.
@@ -68,7 +71,9 @@ public class LocaleLoader {
     }
 
     private static void ensureFolder(@NotNull File folder) {
-        if (!folder.exists()) folder.mkdirs();
+        if (!folder.exists()) {
+            folder.mkdirs();
+        }
         String[] files = folder.list();
         if (files == null || files.length == 0) {
             Plugin plugin = LoParkour.getPlugin();

src/main/java/dev/loki/loparkour/config/locale/Locales.java

@@ -26,6 +26,9 @@ import java.util.regex.Pattern;
  */
 public class Locales {
 
+    private Locales() {
+    }
+
     private static final LocaleCache CACHE = new LocaleCache();
     private static final Pattern REPLACEMENT_PATTERN = Pattern.compile("%[a-z]");
 
@@ -144,7 +147,9 @@ public class Locales {
         }
 
         Item item = new Item(mat, name);
-        if (!lore.isEmpty()) item.lore(lore.split("\\|\\|"));
+        if (!lore.isEmpty()) {
+            item.lore(lore.split("\\|\\|"));
+        }
         return item;
     }
 

src/main/java/dev/loki/loparkour/config/options/Option.java

@@ -24,6 +24,9 @@ import java.util.function.BiFunction;
  */
 public class Option {
 
+    private Option() {
+    }
+
     // ── Initialization ────────────────────────────────────────────────────────
 
     public static void init(boolean firstLoad) {

src/main/java/dev/loki/loparkour/config/options/OptionGeneral.java

@@ -19,6 +19,9 @@ import java.util.Map;
  */
 public class OptionGeneral {
 
+    private OptionGeneral() {
+    }
+
     public static double BORDER_SIZE;
     public static List<Integer> POSSIBLE_LEADS;
     public static BlockFace HEADING;

src/main/java/dev/loki/loparkour/config/options/OptionGeneration.java

@@ -11,6 +11,9 @@ import java.util.Map;
  */
 public class OptionGeneration {
 
+    private OptionGeneration() {
+    }
+
     // ── Block generation probabilities ────────────────────────────────────────
     public static double TYPE_NORMAL;
     public static double TYPE_SPECIAL;

src/main/java/dev/loki/loparkour/config/options/OptionParticles.java

@@ -11,6 +11,9 @@ import org.bukkit.Sound;
  */
 public class OptionParticles {
 
+    private OptionParticles() {
+    }
+
     public static Option.ParticleShape PARTICLE_SHAPE;
     public static Sound                SOUND_TYPE;
     public static int                  SOUND_PITCH;
@@ -30,12 +33,16 @@ public class OptionParticles {
 
     private static Sound resolveSound(String name) {
         if (name != null && !name.isEmpty()) {
-            try { return Sound.valueOf(name.toUpperCase()); }
+            try {
-            catch (IllegalArgumentException ignored) {}
+                return Sound.valueOf(name.toUpperCase());
+            } catch (IllegalArgumentException ignored) {
+            }
         }
         for (String fb : new String[]{"BLOCK_NOTE_BLOCK_GUITAR", "BLOCK_NOTE_BLOCK_PLING", "BLOCK_NOTE_PLING"}) {
-            try { return Sound.valueOf(fb); }
+            try {
-            catch (IllegalArgumentException ignored) {}
+                return Sound.valueOf(fb);
+            } catch (IllegalArgumentException ignored) {
+            }
         }
         LoParkour.getPlugin().getLogger().warning("Could not resolve any sound, using first available.");
         return Sound.values()[0];
@@ -43,12 +50,16 @@ public class OptionParticles {
 
     private static Particle resolveParticle(String name) {
         if (name != null && !name.isEmpty()) {
-            try { return Particle.valueOf(name.toUpperCase()); }
+            try {
-            catch (IllegalArgumentException ignored) {}
+                return Particle.valueOf(name.toUpperCase());
+            } catch (IllegalArgumentException ignored) {
+            }
         }
         for (String fb : new String[]{"INSTANT_EFFECT", "SPELL_INSTANT", "CRIT"}) {
-            try { return Particle.valueOf(fb); }
+            try {
-            catch (IllegalArgumentException ignored) {}
+                return Particle.valueOf(fb);
+            } catch (IllegalArgumentException ignored) {
+            }
         }
         LoParkour.getPlugin().getLogger().warning("Could not resolve any particle, using first available.");
         return Particle.values()[0];
@@ -56,8 +67,10 @@ public class OptionParticles {
 
     private static Option.ParticleShape resolveShape(String name) {
         if (name != null && !name.isEmpty()) {
-            try { return Option.ParticleShape.valueOf(name.toUpperCase()); }
+            try {
-            catch (IllegalArgumentException ignored) {}
+                return Option.ParticleShape.valueOf(name.toUpperCase());
+            } catch (IllegalArgumentException ignored) {
+            }
         }
         return Option.ParticleShape.BOX;
     }

src/main/java/dev/loki/loparkour/config/options/OptionSQL.java

@@ -1,6 +1,5 @@
 package dev.loki.loparkour.config.options;
 
-import dev.loki.loparkour.LoParkour;
 import dev.loki.loparkour.config.core.Config;
 
 /**
@@ -8,6 +7,9 @@ import dev.loki.loparkour.config.core.Config;
  */
 public class OptionSQL {
 
+    private OptionSQL() {
+    }
+
     public static boolean SQL;
     public static String  SQL_URL;
     public static int     SQL_PORT;

src/main/java/dev/loki/loparkour/config/options/OptionStyles.java

@@ -17,6 +17,9 @@ import java.util.function.BiFunction;
  */
 public class OptionStyles {
 
+    private OptionStyles() {
+    }
+
     public static Set<Style> initStyles(String path, FileConfiguration config,
                                         BiFunction<String, List<Material>, Style> fn) {
         var styles = new HashSet<Style>();

src/main/java/dev/loki/loparkour/generator/core/coordinator/GeneratorStatistics.java

@@ -88,7 +88,7 @@ public class GeneratorStatistics {
         long elapsed = java.time.Duration.between(generator.state.start, java.time.Instant.now()).toMillis();
         Duration d = Duration.ofMillis(elapsed);
 
-        if (format.equals("HH:mm:ss.SSS")) {
+        if ("HH:mm:ss.SSS".equals(format)) {
             long hours = d.toHours();
             long minutes = d.toMinutesPart();
             long seconds = d.toSecondsPart();

src/main/java/dev/loki/loparkour/generator/core/coordinator/ParkourGenerator.java

@@ -70,15 +70,34 @@ public class ParkourGenerator {
     
     
     // Core generation methods
-    public void generate() { placer.generate(); }
+    public void generate() {
-    public void generate(int amount) { placer.generate(amount); }
+        placer.generate();
-    public void generateFirst(Location spawn, Location block) { placer.generateFirst(spawn, block); }
+    }
+
+    public void generate(int amount) {
+        placer.generate(amount);
+    }
+
+    public void generateFirst(Location spawn, Location block) {
+        placer.generateFirst(spawn, block);
+    }
 
     // Lifecycle methods
-    public void startTick() { lifecycle.startTick(); }
+    public void startTick() {
-    public void tick() { lifecycle.tick(); }
+        lifecycle.startTick();
-    public void fall() { lifecycle.fall(); }
+    }
-    protected void score() { lifecycle.score(); }
+
+    public void tick() {
+        lifecycle.tick();
+    }
+
+    public void fall() {
+        lifecycle.fall();
+    }
+
+    protected void score() {
+        lifecycle.score();
+    }
     
     public void reset(boolean regenerate) {
         lifecycle.reset(regenerate);

src/main/java/dev/loki/loparkour/generator/jump/placement/BlockPlacer.java

@@ -105,6 +105,7 @@ public class BlockPlacer {
                     placeNormalBlock(); // Fallback to normal block
                 }
             }
+            default -> {}
         }
     }
     

src/main/java/dev/loki/loparkour/ghost/core/GhostPlayer.java

@@ -86,7 +86,15 @@ public class GhostPlayer {
         }
     }
 
-    public boolean isActive()     { return entity != null && entity.isValid(); }
+    public boolean isActive() {
-    public String getPlayerName() { return data.getPlayerName(); }
+        return entity != null && entity.isValid();
-    public int getScore()         { return data.getScore(); }
+    }
+
+    public String getPlayerName() {
+        return data.getPlayerName();
+    }
+
+    public int getScore() {
+        return data.getScore();
+    }
 }

src/main/java/dev/loki/loparkour/ghost/core/GhostRecorder.java

@@ -62,6 +62,11 @@ public class GhostRecorder {
         return new GhostData(playerUuid, playerName, score, frames);
     }
 
-    public boolean isRecording() { return recording; }
+    public boolean isRecording() {
-    public int getFrameCount()   { return frames.size(); }
+        return recording;
+    }
+
+    public int getFrameCount() {
+        return frames.size();
+    }
 }

src/main/java/dev/loki/loparkour/ghost/model/GhostData.java

@@ -47,10 +47,21 @@ public class GhostData {
 
     // ── Getters ───────────────────────────────────────────────────────────────
 
-    public UUID getPlayerUuid()   { return playerUuid; }
+    public UUID getPlayerUuid() {
-    public String getPlayerName() { return playerName; }
+        return playerUuid;
-    public int getScore()         { return score;      }
+    }
-    public List<GhostFrame> getFrames() { return frames; }
+
+    public String getPlayerName() {
+        return playerName;
+    }
+
+    public int getScore() {
+        return score;
+    }
+
+    public List<GhostFrame> getFrames() {
+        return frames;
+    }
 
     // ── Serialisation ─────────────────────────────────────────────────────────
 

src/main/java/dev/loki/loparkour/hook/floodgate/FloodgateHook.java

@@ -5,6 +5,8 @@ import org.geysermc.floodgate.api.FloodgateApi;
 
 public class FloodgateHook {
 
+    private FloodgateHook() {}
+
     /**
      * Whether this player is a bedrock player.
      *

src/main/java/dev/loki/loparkour/hook/holo/HoloHook.java

@@ -9,6 +9,8 @@ import me.filoghost.holographicdisplays.api.HolographicDisplaysAPI;
 
 public class HoloHook {
 
+    private HoloHook() {}
+
     /**
      * Initializes this hook.
      */

src/main/java/dev/loki/loparkour/hook/papi/PAPIHook.java

@@ -48,6 +48,7 @@ public class PAPIHook extends PlaceholderExpansion {
     }
 
     @Override
+    @SuppressWarnings({"checkstyle:MethodLength", "checkstyle:CyclomaticComplexity"})
     public String onPlaceholderRequest(Player player, @NotNull String params) {
         // placeholders that don't require a player
         switch (params) {
@@ -62,6 +63,7 @@ public class PAPIHook extends PlaceholderExpansion {
                 Score score = Modes.DEFAULT.getLeaderboard().getScoreAtRank(1);
                 return score != null ? Integer.toString(score.score()) : "?";
             }
+            default -> {}
         }
 
         if (params.contains("player_rank_")) {
@@ -102,6 +104,7 @@ public class PAPIHook extends PlaceholderExpansion {
             case "high_score_time" -> {
                 return Modes.DEFAULT.getLeaderboard().get(player.getUniqueId()).time();
             }
+            default -> {}
         }
 
         ParkourUser user = ParkourUser.getUser(player);

src/main/java/dev/loki/loparkour/hook/vault/VaultHook.java

@@ -8,6 +8,8 @@ import org.bukkit.plugin.RegisteredServiceProvider;
 
 public class VaultHook {
 
+    private VaultHook() {}
+
     private static Economy economy;
 
     /**

src/main/java/dev/loki/loparkour/menu/community/CommunityMenu.java

@@ -15,7 +15,11 @@ public class CommunityMenu extends LPMenu {
 
         baseGui(title, 3)
                 .setItem(13, localeItem(player, "community.leaderboards.item"),
-                        e -> { if (ParkourOption.LEADERBOARDS.mayPerform(player)) Menus.LEADERBOARDS.open(player); })
+                        e -> {
+                            if (ParkourOption.LEADERBOARDS.mayPerform(player)) {
+                                Menus.LEADERBOARDS.open(player);
+                            }
+                        })
                 .setItem(22, closeButton(player), e -> player.closeInventory())
                 .open(player);
     }

src/main/java/dev/loki/loparkour/menu/community/LeaderboardsMenu.java

@@ -34,9 +34,13 @@ public class LeaderboardsMenu extends LPMenu {
         List<ItemStack> items = new ArrayList<>();
 
         for (Mode mode : Registry.getModes()) {
-            if (mode.getLeaderboard() == null) continue;
+            if (mode.getLeaderboard() == null) {
+                continue;
+            }
             var item = mode.getItem(locale);
-            if (item == null) continue;
+            if (item == null) {
+                continue;
+            }
             modes.add(mode);
             items.add(item.build());
         }

src/main/java/dev/loki/loparkour/menu/community/SingleLeaderboardMenu.java

@@ -33,7 +33,9 @@ public class SingleLeaderboardMenu extends LPMenu {
     public void open(@NotNull Player player, @NotNull Mode mode, @NotNull Leaderboard.Sort sort, int page) {
         this.currentPage = page;
         Leaderboard leaderboard = mode.getLeaderboard();
-        if (leaderboard == null) return;
+        if (leaderboard == null) {
+            return;
+        }
 
         String locale = locale(player);
         String title = Locales.getString(locale, ParkourOption.LEADERBOARDS.path + ".name");
@@ -44,7 +46,9 @@ public class SingleLeaderboardMenu extends LPMenu {
         for (Map.Entry<UUID, Score> entry : leaderboard.sort(sort).entrySet()) {
             rank++;
             Score score = entry.getValue();
-            if (score == null) continue;
+            if (score == null) {
+                continue;
+            }
 
             ItemStack skull = new ItemStack(Material.PLAYER_HEAD);
             if (rank <= 20 && !ParkourUser.isBedrockPlayer(player)) {
@@ -71,7 +75,9 @@ public class SingleLeaderboardMenu extends LPMenu {
                     .replace("%t", score.time())
                     .replace("%d", score.difficulty()));
             ItemMeta built = base.build().getItemMeta();
-            if (built != null) skull.setItemMeta(built);
+            if (built != null) {
+                skull.setItemMeta(built);
+            }
 
             items.add(skull);
         }
@@ -104,5 +110,7 @@ public class SingleLeaderboardMenu extends LPMenu {
     }
 
     @Override
-    public void open(@NotNull Player player) { /* use open(player, mode, sort) */ }
+    public void open(@NotNull Player player) {
+        /* use open(player, mode, sort) */
+    }
 }

src/main/java/dev/loki/loparkour/menu/core/DynamicMenu.java

@@ -5,7 +5,9 @@ import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.util.*;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
 import java.util.function.BiFunction;
 import java.util.function.Predicate;
 
@@ -29,7 +31,10 @@ public abstract class DynamicMenu {
      */
     // Stub: migrate to LoLib GUI when dynamic rows are wired up.
     /*
-    public void registerMainItem(int row, int id, BiFunction<@NotNull Player, @Nullable ParkourUser, dev.loki.loparkour.util.gui.MenuItem> item, Predicate<Player> shouldDisplay) {
+    public void registerMainItem(
+            int row, int id,
+            BiFunction<@NotNull Player, @Nullable ParkourUser, dev.loki.loparkour.util.gui.MenuItem> item,
+            Predicate<Player> shouldDisplay) {
         if (id < 0 || row < 0 || row > 4) {
             return;
         }
@@ -75,6 +80,9 @@ public abstract class DynamicMenu {
     /**
      * Data class for registered items
      */
-    protected record ItemContainer(int id, BiFunction<@NotNull Player, @Nullable ParkourUser, dev.loki.loparkour.util.gui.MenuItem> item,
+    protected record ItemContainer(
-                                   Predicate<Player> predicate) {}
+            int id,
+            BiFunction<@NotNull Player, @Nullable ParkourUser, dev.loki.loparkour.util.gui.MenuItem> item,
+            Predicate<Player> predicate
+    ) {}
 }

src/main/java/dev/loki/loparkour/menu/lobby/LobbyMenu.java

@@ -21,7 +21,9 @@ public class LobbyMenu extends LPMenu {
     @Override
     public void open(@NotNull Player player) {
         ParkourUser user = ParkourUser.getUser(player);
-        if (user == null) return;
+        if (user == null) {
+            return;
+        }
 
         String locale = user.locale;
         String title = Locales.getString(locale, "lobby.name");

src/main/java/dev/loki/loparkour/menu/lobby/PlayerManagementMenu.java

@@ -24,7 +24,9 @@ public class PlayerManagementMenu extends LPMenu {
     @Override
     public void open(@NotNull Player player) {
         ParkourPlayer viewer = ParkourPlayer.getPlayer(player);
-        if (viewer == null) return;
+        if (viewer == null) {
+            return;
+        }
 
         var session = viewer.session;
         String locale = viewer.locale;

src/main/java/dev/loki/loparkour/menu/play/PlayMenu.java

@@ -15,9 +15,17 @@ public class PlayMenu extends LPMenu {
 
         baseGui(title, 3)
                 .setItem(11, localeItem(player, "play.single.item"),
-                        e -> { if (ParkourOption.SINGLE.mayPerform(player)) Menus.SINGLE.open(player); })
+                        e -> {
+                            if (ParkourOption.SINGLE.mayPerform(player)) {
+                                Menus.SINGLE.open(player);
+                            }
+                        })
                 .setItem(15, localeItem(player, "play.spectator.item"),
-                        e -> { if (ParkourOption.SPECTATOR.mayPerform(player)) Menus.SPECTATOR.open(player); })
+                        e -> {
+                            if (ParkourOption.SPECTATOR.mayPerform(player)) {
+                                Menus.SPECTATOR.open(player);
+                            }
+                        })
                 .setItem(22, closeButton(player), e -> player.closeInventory())
                 .open(player);
     }

src/main/java/dev/loki/loparkour/menu/play/SingleMenu.java

@@ -33,17 +33,25 @@ public class SingleMenu extends LPMenu {
 
         for (Mode mode : Registry.getModes()) {
             // Skip spectator mode in single menu
-            if (mode.getName().equals("spectator")) continue;
+            if ("spectator".equals(mode.getName())) {
+                continue;
+            }
 
             // Check if mode is enabled in config
-            if (!Config.CONFIG.getBoolean("modes." + mode.getName() + ".enabled", true)) continue;
+            if (!Config.CONFIG.getBoolean("modes." + mode.getName() + ".enabled", true)) {
+                continue;
+            }
 
             boolean blocked = Config.CONFIG.getBoolean("permissions.enabled")
                     && !player.hasPermission("LoParkour.gamemode." + mode.getName());
-            if (blocked) continue;
+            if (blocked) {
+                continue;
+            }
 
             var item = mode.getItem(locale);
-            if (item == null) continue;
+            if (item == null) {
+                continue;
+            }
             
             availableModes.add(mode);
             items.add(item.build());

src/main/java/dev/loki/loparkour/menu/play/SpectatorMenu.java

@@ -35,10 +35,16 @@ public class SpectatorMenu extends LPMenu {
         List<Session> sessions = new ArrayList<>();
         List<ItemStack> items = new ArrayList<>();
 
-        for (Session session : Divider.sections.keySet()) {
+        for (Session session : Divider.SECTIONS.keySet()) {
-            if (!session.isAcceptingSpectators()) continue;
+            if (!session.isAcceptingSpectators()) {
-            if (user != null && session == user.session) continue;
+                continue;
-            if (session.getPlayers().isEmpty()) continue;
+            }
+            if (user != null && session == user.session) {
+                continue;
+            }
+            if (session.getPlayers().isEmpty()) {
+                continue;
+            }
 
             var pp = session.getPlayers().get(0);
             ItemStack skull = new ItemStack(Material.PLAYER_HEAD);

src/main/java/dev/loki/loparkour/menu/settings/LangMenu.java

@@ -18,14 +18,18 @@ import java.util.List;
 public class LangMenu extends LPMenu {
 
     public void open(@NotNull ParkourPlayer user) {
-        if (user == null) return;
+        if (user == null) {
+            return;
+        }
         open(user.player);
     }
 
     @Override
     public void open(@NotNull Player player) {
         ParkourPlayer pp = ParkourPlayer.getPlayer(player);
-        if (pp == null) return;
+        if (pp == null) {
+            return;
+        }
 
         String locale = pp.locale;
         String title = Locales.getString(locale, "settings.lang.name");
@@ -44,7 +48,6 @@ public class LangMenu extends LPMenu {
                 item.setItemMeta(meta);
             }
             gui = gui.setItem(10 + i, item, e -> {
-                pp.locale = lang;
                 pp.locale = lang;
                 pp.updateHotbar(); // Update hotbar with new language
                 Menus.SETTINGS.open(player);

src/main/java/dev/loki/loparkour/menu/settings/ParkourSettingsMenu.java

@@ -22,14 +22,18 @@ import java.util.List;
 public class ParkourSettingsMenu extends LPMenu {
 
     public void open(@NotNull ParkourPlayer user) {
-        if (user == null) return;
+        if (user == null) {
+            return;
+        }
         open(user.player);
     }
 
     @Override
     public void open(@NotNull Player player) {
         ParkourPlayer pp = ParkourPlayer.getPlayer(player);
-        if (pp == null) return;
+        if (pp == null) {
+            return;
+        }
 
         String locale = pp.locale;
         String title = Locales.getString(locale, "settings.name");
@@ -151,10 +155,14 @@ public class ParkourSettingsMenu extends LPMenu {
 
         int slot = 10;
         for (Style style : Registry.getStyles()) {
-            if (slot > 16) break;
+            if (slot > 16) {
+                break;
+            }
             String name = style.getName();
             String perm = ParkourOption.STYLES.permission + "." + name.toLowerCase().replace(" ", ".");
-            if (Config.CONFIG.getBoolean("permissions.per-style") && !player.hasPermission(perm)) continue;
+            if (Config.CONFIG.getBoolean("permissions.per-style") && !player.hasPermission(perm)) {
+                continue;
+            }
 
             ItemStack item = new ItemStack(style.getNext());
             ItemMeta meta = item.getItemMeta();

src/main/java/dev/loki/loparkour/menu/settings/SettingsMenu.java

@@ -22,7 +22,9 @@ public class SettingsMenu extends LPMenu {
         if (ParkourOption.PARKOUR_SETTINGS.mayPerform(player) && ParkourPlayer.isPlayer(player)) {
             gui = gui.setItem(11, localeItem(player, "settings.parkour_settings.item"), e -> {
                 ParkourPlayer pp = ParkourPlayer.getPlayer(player);
-                if (pp != null) pp.session.generator.menu(pp);
+                if (pp != null) {
+                    pp.session.generator.menu(pp);
+                }
             });
         }
 
@@ -30,7 +32,9 @@ public class SettingsMenu extends LPMenu {
             String langName = Locales.getString(locale, "name");
             gui = gui.setItem(13, localeItem(locale, "settings.lang.item", langName), e -> {
                 ParkourPlayer pp = ParkourPlayer.getPlayer(player);
-                if (pp != null) Menus.LANG.open(pp);
+                if (pp != null) {
+                    Menus.LANG.open(pp);
+                }
             });
         }
 

src/main/java/dev/loki/loparkour/mode/impl/CoopMode.java

@@ -114,7 +114,9 @@ public class CoopMode implements MultiMode {
     @Override
     public void leave(Player player, Session session) {
         ParkourPlayer pp = ParkourPlayer.getPlayer(player);
-        if (pp == null) return;
+        if (pp == null) {
+            return;
+        }
         ParkourUser.leave(pp);
     }
 

src/main/java/dev/loki/loparkour/player/core/ParkourPlayer.java

@@ -82,7 +82,7 @@ public class ParkourPlayer extends ParkourUser {
      */
     public static @Nullable ParkourPlayer getPlayer(@NotNull Player player) {
         // Optimized: search directly in sessions without creating intermediate list
-        return Divider.sections.keySet().stream()
+        return Divider.SECTIONS.keySet().stream()
                 .flatMap(session -> session.getPlayers().stream())
                 .filter(other -> other.getUUID().equals(player.getUniqueId()))
                 .findAny()
@@ -93,7 +93,7 @@ public class ParkourPlayer extends ParkourUser {
      * @return List with all players.
      */
     public static List<ParkourPlayer> getPlayers() {
-        return Divider.sections.keySet().stream()
+        return Divider.SECTIONS.keySet().stream()
                 .flatMap(session -> session.getPlayers().stream())
                 .toList();
     }

src/main/java/dev/loki/loparkour/player/service/UserRegistry.java

@@ -92,7 +92,7 @@ public final class UserRegistry {
     }
 
     public static Set<ParkourUser> getUsers() {
-        return Divider.sections.keySet().stream()
+        return Divider.SECTIONS.keySet().stream()
                 .flatMap(session -> session.getUsers().stream())
                 .collect(Collectors.toSet());
     }

src/main/java/dev/loki/loparkour/schematic/legacy/lpschem/LPSchematicLegacy.java

@@ -49,7 +49,7 @@ public final class LPSchematicLegacy {
         }
 
         SchematicData data = GSON.fromJson(json.toString(), SchematicData.class);
-        if (data == null || data.format_version != FORMAT_VERSION) {
+        if (data == null || data.formatVersion != FORMAT_VERSION) {
             throw new IOException("Unsupported .lpschem format in " + file.getName());
         }
 
@@ -77,7 +77,7 @@ public final class LPSchematicLegacy {
     }
 
     private static class SchematicData {
-        int format_version;
+        int formatVersion;
         SchematicMetadata metadata;
         SchematicDimensions dimensions;
         List<String> palette;

src/main/java/dev/loki/loparkour/session/manager/SessionUserManager.java

@@ -6,7 +6,11 @@ import dev.loki.loparkour.player.core.ParkourPlayer;
 import dev.loki.loparkour.player.spectator.ParkourSpectator;
 import dev.loki.loparkour.player.core.ParkourUser;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
 
 /**
  * Manages users (players and spectators) within a session.
@@ -19,7 +23,7 @@ class SessionUserManager {
     private final List<ParkourUser> muted = new ArrayList<>();
     private final Session session;
 
-    public SessionUserManager(Session session) {
+    SessionUserManager(Session session) {
         this.session = session;
     }
 

src/main/java/dev/loki/loparkour/storage/sql/SQLConnectionManager.java

@@ -6,7 +6,6 @@ import dev.loki.loparkour.LoParkour;
 import dev.loki.loparkour.config.options.Option;
 
 import java.sql.Connection;
-import java.sql.PreparedStatement;
 import java.sql.SQLException;
 import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;

src/main/java/dev/loki/loparkour/storage/sql/SQLMigrationManager.java

@@ -11,7 +11,7 @@ class SQLMigrationManager {
 
     private final SQLQueryExecutor queryExecutor;
 
-    public SQLMigrationManager(SQLQueryExecutor queryExecutor) {
+    SQLMigrationManager(SQLQueryExecutor queryExecutor) {
         this.queryExecutor = queryExecutor;
     }
 

src/main/java/dev/loki/loparkour/storage/sql/SQLQueryExecutor.java

@@ -18,7 +18,7 @@ class SQLQueryExecutor {
 
     private final SQLConnectionManager connectionManager;
 
-    public SQLQueryExecutor(SQLConnectionManager connectionManager) {
+    SQLQueryExecutor(SQLConnectionManager connectionManager) {
         this.connectionManager = connectionManager;
     }
 

src/main/java/dev/loki/loparkour/world/core/Divider.java

@@ -9,7 +9,7 @@ import java.util.Map;
 import java.util.stream.IntStream;
 
 /**
- * <p>Divides the parkour world in sections, each with an active session.</p>
+ * <p>Divides the parkour world in SECTIONS, each with an active session.</p>
  * <p>Iteration 2.</p>
  *
  * @author loki
@@ -23,7 +23,7 @@ public class Divider {
     /**
      * Map with all session ids map to the session instances.
      */
-    public static final Map<Session, Integer> sections = new HashMap<>();
+    public static final Map<Session, Integer> SECTIONS = new HashMap<>();
 
     /**
      * Associates a session to a specific section.
@@ -32,12 +32,12 @@ public class Divider {
      */
     public static synchronized Location add(Session session) {
         // attempts to get the closest available section to the center
-        var missing = IntStream.range(0, sections.size() + 1)
+        var missing = IntStream.range(0, SECTIONS.size() + 1)
-                .filter(i -> !sections.containsValue(i))
+                .filter(i -> !SECTIONS.containsValue(i))
                 .findFirst()
                 .orElseThrow();
 
-        sections.put(session, missing);
+        SECTIONS.put(session, missing);
 
         var location = toLocation(session);
 
@@ -50,7 +50,7 @@ public class Divider {
      * @param session The session.
      */
     public static void remove(Session session) {
-        sections.remove(session);
+        SECTIONS.remove(session);
     }
 
     /**
@@ -58,7 +58,7 @@ public class Divider {
      * @return The location at the center of section n.
      */
     private static Location toLocation(Session session) {
-        int[] xz = spiralAt(sections.get(session));
+        int[] xz = spiralAt(SECTIONS.get(session));
 
         return new Location(World.getWorld(),
                 xz[0] * Option.BORDER_SIZE,