Merge pull request #779 from Smart123s/feature/codeformatter

Add a code formatter

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/BukkitLoginSession.java

@@ -51,8 +51,8 @@ public class BukkitLoginSession extends LoginSession {
 
     private SkinProperty skinProperty;
 
-    public BukkitLoginSession(String username, byte[] verifyToken, ClientPublicKey publicKey, boolean registered
+    public BukkitLoginSession(String username, byte[] verifyToken, ClientPublicKey publicKey, boolean registered,
-            , StoredProfile profile) {
+                              StoredProfile profile) {
         super(username, registered, profile);
 
         this.clientPublicKey = publicKey;

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/BungeeManager.java

@@ -33,6 +33,7 @@ import com.google.common.io.ByteArrayDataOutput;
 import com.google.common.io.ByteStreams;
 
 import java.io.IOException;
+import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -113,7 +114,9 @@ public class BungeeManager {
             Class<?> globalConfig = Class.forName("io.papermc.paper.configuration.GlobalConfiguration");
             Object global = globalConfig.getDeclaredMethod("get").invoke(null);
             Object proxiesConfiguration = global.getClass().getDeclaredField("proxies").get(global);
-            Object velocityConfig = proxiesConfiguration.getClass().getDeclaredField("velocity").get(proxiesConfiguration);
+
+            Field velocitySectionField = proxiesConfiguration.getClass().getDeclaredField("velocity");
+            Object velocityConfig = velocitySectionField.get(proxiesConfiguration);
 
             return velocityConfig.getClass().getDeclaredField("enabled").getBoolean(velocityConfig);
         } catch (ClassNotFoundException classNotFoundException) {
@@ -128,7 +131,9 @@ public class BungeeManager {
 
     private boolean detectProxy() {
         try {
-            if (isProxySupported("org.spigotmc.SpigotConfig", "bungee")) return true;
+            if (isProxySupported("org.spigotmc.SpigotConfig", "bungee")) {
+                return true;
+            }
         } catch (ClassNotFoundException classNotFoundException) {
             // leave stacktrace for class not found out
             plugin.getLog().warn("Cannot check for BungeeCord support: {}", classNotFoundException.getMessage());

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/FastLoginBukkit.java

@@ -120,18 +120,7 @@ public class FastLoginBukkit extends JavaPlugin implements PlatformPlugin<Comman
                 ProtocolLibListener.register(this, core.getAntiBot(), core.getConfig().getBoolean("verifyClientKeys"));
 
                 if (isPluginInstalled("floodgate")) {
-                    if (getConfig().getBoolean("floodgatePrefixWorkaround")){
+                    printFloodgateWarning();
-                        ManualNameChange.register(this, floodgateService);
-                        logger.info("Floodgate prefix injection workaround has been enabled.");
-                        logger.info("If you have problems joining the server, try disabling it in the configuration.");
-                    } else {
-                        logger.warn("We have detected that you are running FastLogin alongside Floodgate and ProtocolLib.");
-                        logger.warn("Currently there is an issue with FastLogin that prevents Floodgate name prefixes from showing up "
-                                + "when it is together used with ProtocolLib.");
-                        logger.warn("If you would like to use Floodgate name prefixes, you can enable an experimental workaround by changing "
-                                + "the value 'floodgatePrefixWorkaround' to true in config.yml.");
-                        logger.warn("For more information visit https://github.com/games647/FastLogin/issues/493");
-                    }
                 }
 
                 //if server is using paper - we need to set the skin at pre login anyway, so no need for this listener
@@ -167,6 +156,21 @@ public class FastLoginBukkit extends JavaPlugin implements PlatformPlugin<Comman
         dependencyWarnings();
     }
 
+    private void printFloodgateWarning() {
+        if (getConfig().getBoolean("floodgatePrefixWorkaround")) {
+            ManualNameChange.register(this, floodgateService);
+            logger.info("Floodgate prefix injection workaround has been enabled.");
+            logger.info("If you have problems joining the server, try disabling it in the configuration.");
+        } else {
+            logger.warn("We have detected that you are running FastLogin alongside Floodgate and ProtocolLib.");
+            logger.warn("Currently there is an issue with FastLogin that prevents Floodgate name prefixes from "
+                + "showing up when it is together used with ProtocolLib.");
+            logger.warn("If you would like to use Floodgate name prefixes, you can enable an experimental "
+                + "workaround by changing the value 'floodgatePrefixWorkaround' to true in config.yml.");
+            logger.warn("For more information visit https://github.com/games647/FastLogin/issues/493");
+        }
+    }
+
     private boolean initializeFloodgate() {
         if (getServer().getPluginManager().getPlugin("Geyser-Spigot") != null) {
             geyserService = new GeyserService(GeyserImpl.getInstance(), core);
@@ -297,6 +301,7 @@ public class FastLoginBukkit extends JavaPlugin implements PlatformPlugin<Comman
 
     /**
      * Checks if a plugin is installed on the server
+     *
      * @param name the name of the plugin
      * @return true if the plugin is installed
      */

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/command/CrackedCommand.java

@@ -42,7 +42,8 @@ public class CrackedCommand extends ToggleCommand {
     }
 
     @Override
-    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label,
+                             String[] args) {
         if (args.length == 0) {
             onCrackedSelf(sender);
         } else {

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/command/PremiumCommand.java

@@ -49,7 +49,8 @@ public class PremiumCommand extends ToggleCommand {
     }
 
     @Override
-    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label,
+                             String[] args) {
         if (args.length == 0) {
             onPremiumSelf(sender);
         } else {

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/event/BukkitFastLoginAutoLoginEvent.java

@@ -36,7 +36,7 @@ import org.jetbrains.annotations.NotNull;
 
 public class BukkitFastLoginAutoLoginEvent extends Event implements FastLoginAutoLoginEvent, Cancellable {
 
-    private static final HandlerList handlers = new HandlerList();
+    private static final HandlerList HANDLERS = new HandlerList();
     private final LoginSession session;
     private final StoredProfile profile;
     private boolean cancelled;
@@ -70,10 +70,10 @@ public class BukkitFastLoginAutoLoginEvent extends Event implements FastLoginAut
 
     @Override
     public @NotNull HandlerList getHandlers() {
-        return handlers;
+        return HANDLERS;
     }
 
     public static HandlerList getHandlerList() {
-        return handlers;
+        return HANDLERS;
     }
 }

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/event/BukkitFastLoginPreLoginEvent.java

@@ -35,7 +35,7 @@ import org.jetbrains.annotations.NotNull;
 
 public class BukkitFastLoginPreLoginEvent extends Event implements FastLoginPreLoginEvent {
 
-    private static final HandlerList handlers = new HandlerList();
+    private static final HandlerList HANDLERS = new HandlerList();
     private final String username;
     private final LoginSource source;
     private final StoredProfile profile;
@@ -65,10 +65,10 @@ public class BukkitFastLoginPreLoginEvent extends Event implements FastLoginPreL
 
     @Override
     public @NotNull HandlerList getHandlers() {
-        return handlers;
+        return HANDLERS;
     }
 
     public static HandlerList getHandlerList() {
-        return handlers;
+        return HANDLERS;
     }
 }

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/event/BukkitFastLoginPremiumToggleEvent.java

@@ -34,7 +34,7 @@ import org.jetbrains.annotations.NotNull;
 
 public class BukkitFastLoginPremiumToggleEvent extends Event implements FastLoginPremiumToggleEvent {
 
-    private static final HandlerList handlers = new HandlerList();
+    private static final HandlerList HANDLERS = new HandlerList();
     private final StoredProfile profile;
     private final PremiumToggleReason reason;
 
@@ -56,10 +56,10 @@ public class BukkitFastLoginPremiumToggleEvent extends Event implements FastLogi
 
     @Override
     public @NotNull HandlerList getHandlers() {
-        return handlers;
+        return HANDLERS;
     }
 
     public static HandlerList getHandlerList() {
-        return handlers;
+        return HANDLERS;
     }
 }

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/hook/XAuthHook.java

@@ -44,12 +44,12 @@ import org.bukkit.entity.Player;
  * <p>
  * Bukkit: <a href="https://dev.bukkit.org/bukkit-plugins/xauth/">...</a>
  */
-public class xAuthHook implements AuthPlugin<Player> {
+public class XAuthHook implements AuthPlugin<Player> {
 
     private final xAuth xAuthPlugin = xAuth.getPlugin();
     private final FastLoginBukkit plugin;
 
-    public xAuthHook(FastLoginBukkit plugin) {
+    public XAuthHook(FastLoginBukkit plugin) {
         this.plugin = plugin;
     }
 

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/ConnectionListener.java

@@ -97,8 +97,8 @@ public class ConnectionListener implements Listener {
 
             String sessionId = plugin.getSessionId(player.getAddress());
             plugin.getLog().info("No on-going login session for player: {} with ID {}. ", player, sessionId);
-            plugin.getLog().info("Setups using Minecraft proxies will start delayed " +
+            plugin.getLog().info("Setups using Minecraft proxies will start delayed "
-                "when the command from the proxy is received");
+                + "when the command from the proxy is received");
         } else {
             Runnable forceLoginTask = new ForceLoginTask(plugin.getCore(), player, session);
             Bukkit.getScheduler().runTaskAsynchronously(plugin, forceLoginTask);

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/protocollib/EncryptionUtil.java

@@ -34,7 +34,6 @@ import com.google.common.primitives.Longs;
 import java.io.IOException;
 import java.math.BigInteger;
 import java.nio.charset.StandardCharsets;
-import java.security.GeneralSecurityException;
 import java.security.InvalidKeyException;
 import java.security.KeyFactory;
 import java.security.KeyPair;
@@ -63,20 +62,22 @@ import javax.crypto.spec.SecretKeySpec;
  * Encryption and decryption minecraft util for connection between servers
  * and paid Minecraft account clients.
  */
-class EncryptionUtil {
+final class EncryptionUtil {
 
     public static final int VERIFY_TOKEN_LENGTH = 4;
     public static final String KEY_PAIR_ALGORITHM = "RSA";
 
     private static final int RSA_LENGTH = 1_024;
 
-    private static final PublicKey mojangSessionKey;
+    private static final PublicKey MOJANG_SESSION_KEY;
     private static final int LINE_LENGTH = 76;
-    private static final Encoder KEY_ENCODER = Base64.getMimeEncoder(LINE_LENGTH, "\n".getBytes(StandardCharsets.UTF_8));
+    private static final Encoder KEY_ENCODER = Base64.getMimeEncoder(
+        LINE_LENGTH, "\n".getBytes(StandardCharsets.UTF_8)
+    );
 
     static {
         try {
-            mojangSessionKey = loadMojangSessionKey();
+            MOJANG_SESSION_KEY = loadMojangSessionKey();
         } catch (IOException | NoSuchAlgorithmException | InvalidKeySpecException ex) {
             throw new RuntimeException("Failed to load Mojang session key", ex);
         }
@@ -135,7 +136,6 @@ class EncryptionUtil {
      * @param privateKey private server key
      * @param sharedKey  the encrypted shared key
      * @return shared secret key
-     * @throws GeneralSecurityException if it fails to decrypt the data
      */
     public static SecretKey decryptSharedKey(PrivateKey privateKey, byte[] sharedKey)
         throws NoSuchPaddingException, IllegalBlockSizeException, NoSuchAlgorithmException,
@@ -151,7 +151,7 @@ class EncryptionUtil {
 
         Signature verifier = Signature.getInstance("SHA1withRSA");
         // key of the signer
-        verifier.initVerify(mojangSessionKey);
+        verifier.initVerify(MOJANG_SESSION_KEY);
         verifier.update(toSignable(clientKey).getBytes(StandardCharsets.US_ASCII));
         return verifier.verify(clientKey.signature());
     }

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/protocollib/NameCheckTask.java

@@ -88,8 +88,8 @@ public class NameCheckTask extends JoinManagement<Player, CommandSender, Protoco
     //Minecraft server implementation
     //https://github.com/bergerkiller/CraftSource/blob/master/net.minecraft.server/LoginListener.java#L161
     @Override
-    public void requestPremiumLogin(ProtocolLibLoginSource source, StoredProfile profile
+    public void requestPremiumLogin(ProtocolLibLoginSource source, StoredProfile profile,
-        , String username, boolean registered) {
+                                    String username, boolean registered) {
         try {
             source.enableOnlinemode();
         } catch (Exception ex) {

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/protocollib/ProtocolLibListener.java

@@ -147,13 +147,16 @@ public class ProtocolLibListener extends PacketAdapter {
 
         BukkitLoginSession session = plugin.getSession(sender.getAddress());
         if (session == null) {
-            plugin.getLog().warn("GameProfile {} tried to send encryption response at invalid state", sender.getAddress());
+            plugin.getLog().warn("Profile {} tried to send encryption response at invalid state", sender.getAddress());
             sender.kickPlayer(plugin.getCore().getMessage("invalid-request"));
         } else {
             byte[] expectedVerifyToken = session.getVerifyToken();
             if (verifyNonce(sender, packetEvent.getPacket(), session.getClientPublicKey(), expectedVerifyToken)) {
                 packetEvent.getAsyncMarker().incrementProcessingDelay();
-                Runnable verifyTask = new VerifyResponseTask(plugin, packetEvent, sender, session, sharedSecret, keyPair);
+
+                Runnable verifyTask = new VerifyResponseTask(
+                    plugin, packetEvent, sender, session, sharedSecret, keyPair
+                );
                 plugin.getScheduler().runAsync(verifyTask);
             } else {
                 sender.kickPlayer(plugin.getCore().getMessage("invalid-verify-token"));
@@ -192,8 +195,8 @@ public class ProtocolLibListener extends PacketAdapter {
                 byte[] nonce = packet.getByteArrays().read(1);
                 return EncryptionUtil.verifyNonce(expectedToken, keyPair.getPrivate(), nonce);
             }
-        } catch (NoSuchAlgorithmException | InvalidKeyException | SignatureException | NoSuchPaddingException |
+        } catch (NoSuchAlgorithmException | InvalidKeyException | SignatureException | NoSuchPaddingException
-                 IllegalBlockSizeException | BadPaddingException signatureEx) {
+                 | IllegalBlockSizeException | BadPaddingException signatureEx) {
             plugin.getLog().error("Invalid signature from player {}", sender, signatureEx);
             return false;
         }
@@ -227,7 +230,9 @@ public class ProtocolLibListener extends PacketAdapter {
         plugin.getLog().trace("GameProfile {} with {} connecting", sessionKey, username);
 
         packetEvent.getAsyncMarker().incrementProcessingDelay();
-        Runnable nameCheckTask = new NameCheckTask(plugin, random, player, packetEvent, username, clientKey.orElse(null), keyPair.getPublic());
+        Runnable nameCheckTask = new NameCheckTask(
+            plugin, random, player, packetEvent, username, clientKey.orElse(null), keyPair.getPublic()
+        );
         plugin.getScheduler().runAsync(nameCheckTask);
     }
 

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/protocollib/ProtocolLibLoginSource.java

@@ -55,7 +55,7 @@ class ProtocolLibLoginSource implements LoginSource {
     private final String serverId = "";
     private byte[] verifyToken;
 
-    public ProtocolLibLoginSource(Player player, Random random, PublicKey serverPublicKey, ClientPublicKey clientKey) {
+    ProtocolLibLoginSource(Player player, Random random, PublicKey serverPublicKey, ClientPublicKey clientKey) {
         this.player = player;
         this.random = random;
         this.publicKey = serverPublicKey;
@@ -126,11 +126,11 @@ class ProtocolLibLoginSource implements LoginSource {
 
     @Override
     public String toString() {
-        return this.getClass().getSimpleName() + '{' +
+        return this.getClass().getSimpleName() + '{'
-                "player=" + player +
+            + "player=" + player
-                ", random=" + random +
+            + ", random=" + random
-                ", serverId='" + serverId + '\'' +
+            + ", serverId='" + serverId + '\''
-                ", verifyToken=" + Arrays.toString(verifyToken) +
+            + ", verifyToken=" + Arrays.toString(verifyToken)
-                '}';
+            + '}';
     }
 }

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/protocollib/VerifyResponseTask.java

@@ -71,7 +71,9 @@ public class VerifyResponseTask implements Runnable {
     private static final Class<?> ENCRYPTION_CLASS;
 
     static {
-        ENCRYPTION_CLASS = MinecraftReflection.getMinecraftClass("util." + ENCRYPTION_CLASS_NAME, ENCRYPTION_CLASS_NAME);
+        ENCRYPTION_CLASS = MinecraftReflection.getMinecraftClass(
+            "util." + ENCRYPTION_CLASS_NAME, ENCRYPTION_CLASS_NAME
+        );
     }
 
     private final FastLoginBukkit plugin;
@@ -144,7 +146,11 @@ public class VerifyResponseTask implements Runnable {
                 encryptConnection(session, requestedUsername, response.get());
             } else {
                 //user tried to fake an authentication
-                disconnect("invalid-session", "GameProfile {} ({}) tried to log in with an invalid session. ServerId: {}", session.getRequestUsername(), socketAddress, serverId);
+                disconnect(
+                    "invalid-session",
+                    "GameProfile {} ({}) tried to log in with an invalid session. ServerId: {}",
+                    session.getRequestUsername(), socketAddress, serverId
+                );
             }
         } catch (IOException ioEx) {
             disconnect("error-kick", "Failed to connect to session server", ioEx);

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/protocolsupport/ProtocolLoginSource.java

@@ -60,8 +60,8 @@ public class ProtocolLoginSource implements LoginSource {
 
     @Override
     public String toString() {
-        return this.getClass().getSimpleName() + '{' +
+        return this.getClass().getSimpleName() + '{'
-                "loginStartEvent=" + loginStartEvent +
+            + "loginStartEvent=" + loginStartEvent
-                '}';
+            + '}';
     }
 }

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/protocolsupport/ProtocolSupportListener.java

@@ -112,15 +112,16 @@ public class ProtocolSupportListener extends JoinManagement<Player, CommandSende
     }
 
     @Override
-    public FastLoginPreLoginEvent callFastLoginPreLoginEvent(String username, ProtocolLoginSource source, StoredProfile profile) {
+    public FastLoginPreLoginEvent callFastLoginPreLoginEvent(String username, ProtocolLoginSource source,
+                                                             StoredProfile profile) {
         BukkitFastLoginPreLoginEvent event = new BukkitFastLoginPreLoginEvent(username, source, profile);
         plugin.getServer().getPluginManager().callEvent(event);
         return event;
     }
 
     @Override
-    public void requestPremiumLogin(ProtocolLoginSource source, StoredProfile profile, String username
+    public void requestPremiumLogin(ProtocolLoginSource source, StoredProfile profile, String username,
-            , boolean registered) {
+                                    boolean registered) {
         source.enableOnlinemode();
 
         String ip = source.getAddress().getAddress().getHostAddress();

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/task/DelayedAuthHook.java

@@ -31,7 +31,7 @@ import com.github.games647.fastlogin.bukkit.hook.CrazyLoginHook;
 import com.github.games647.fastlogin.bukkit.hook.LogItHook;
 import com.github.games647.fastlogin.bukkit.hook.LoginSecurityHook;
 import com.github.games647.fastlogin.bukkit.hook.UltraAuthHook;
-import com.github.games647.fastlogin.bukkit.hook.xAuthHook;
+import com.github.games647.fastlogin.bukkit.hook.XAuthHook;
 import com.github.games647.fastlogin.core.hooks.AuthPlugin;
 
 import java.lang.reflect.Constructor;
@@ -95,7 +95,7 @@ public class DelayedAuthHook implements Runnable {
         try {
             List<Class<? extends AuthPlugin<Player>>> hooks = Arrays.asList(AuthMeHook.class,
                 CrazyLoginHook.class, LogItHook.class, LoginSecurityHook.class, UltraAuthHook.class,
-                xAuthHook.class);
+                XAuthHook.class);
 
             for (Class<? extends AuthPlugin<Player>> clazz : hooks) {
                 String pluginName = clazz.getSimpleName();

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/task/FloodgateAuthTask.java

@@ -40,7 +40,8 @@ import org.geysermc.floodgate.api.player.FloodgatePlayer;
 
 public class FloodgateAuthTask extends FloodgateManagement<Player, CommandSender, BukkitLoginSession, FastLoginBukkit> {
 
-    public FloodgateAuthTask(FastLoginCore<Player, CommandSender, FastLoginBukkit> core, Player player, FloodgatePlayer floodgatePlayer) {
+    public FloodgateAuthTask(FastLoginCore<Player, CommandSender, FastLoginBukkit> core, Player player,
+                             FloodgatePlayer floodgatePlayer) {
         super(core, player, floodgatePlayer);
     }
 

bungee/src/main/java/com/github/games647/fastlogin/bungee/BungeeLoginSession.java

@@ -59,10 +59,10 @@ public class BungeeLoginSession extends LoginSession {
 
     @Override
     public synchronized String toString() {
-        return this.getClass().getSimpleName() + '{' +
+        return this.getClass().getSimpleName() + '{'
-                "alreadySaved=" + alreadySaved +
+            + "alreadySaved=" + alreadySaved
-                ", alreadyLogged=" + alreadyLogged +
+            + ", alreadyLogged=" + alreadyLogged
-                ", registered=" + registered +
+            + ", registered=" + registered
-                "} " + super.toString();
+            + "} " + super.toString();
     }
 }

bungee/src/main/java/com/github/games647/fastlogin/bungee/BungeeLoginSource.java

@@ -72,8 +72,8 @@ public class BungeeLoginSource implements LoginSource {
 
     @Override
     public String toString() {
-        return this.getClass().getSimpleName() + '{' +
+        return this.getClass().getSimpleName() + '{'
-                "connection=" + connection +
+            + "connection=" + connection
-                '}';
+            + '}';
     }
 }

bungee/src/main/java/com/github/games647/fastlogin/bungee/listener/ConnectListener.java

@@ -71,7 +71,7 @@ import org.slf4j.LoggerFactory;
 public class ConnectListener implements Listener {
 
     private static final String UUID_FIELD_NAME = "uniqueId";
-    private static final MethodHandle uniqueIdSetter;
+    private static final MethodHandle UNIQUE_ID_SETTER;
 
     static {
         MethodHandle setHandle = null;
@@ -91,7 +91,7 @@ public class ConnectListener implements Listener {
             );
         }
 
-        uniqueIdSetter = setHandle;
+        UNIQUE_ID_SETTER = setHandle;
     }
 
     private final FastLoginBungee plugin;
@@ -155,7 +155,7 @@ public class ConnectListener implements Listener {
             playerProfile.setId(verifiedUUID);
 
             // BungeeCord will do this automatically so override it on disabled option
-            if (uniqueIdSetter != null) {
+            if (UNIQUE_ID_SETTER != null) {
                 InitialHandler initialHandler = (InitialHandler) connection;
 
                 if (!plugin.getCore().getConfig().get("premiumUuid", true)) {
@@ -179,7 +179,7 @@ public class ConnectListener implements Listener {
             // BungeeCord only allows setting the UUID in PreLogin events and before requesting online mode
             // However if online mode is requested, it will override previous values
             // So we have to do it with reflection
-            uniqueIdSetter.invokeExact(connection, offlineUUID);
+            UNIQUE_ID_SETTER.invokeExact(connection, offlineUUID);
 
             String format = "Overridden UUID from {} to {} (based of {}) on {}";
             plugin.getLog().info(format, oldPremiumId, offlineUUID, username, connection);

bungee/src/main/java/com/github/games647/fastlogin/bungee/task/AsyncToggleMessage.java

@@ -73,8 +73,8 @@ public class AsyncToggleMessage implements Runnable {
         playerProfile.setPremium(false);
         playerProfile.setId(null);
         core.getStorage().save(playerProfile);
-        PremiumToggleReason reason = (!isPlayerSender || !sender.getName().equalsIgnoreCase(playerProfile.getName())) ?
+        PremiumToggleReason reason = (!isPlayerSender || !sender.getName().equalsIgnoreCase(playerProfile.getName()))
-                PremiumToggleReason.COMMAND_OTHER : PremiumToggleReason.COMMAND_SELF;
+            ? PremiumToggleReason.COMMAND_OTHER : PremiumToggleReason.COMMAND_SELF;
         core.getPlugin().getProxy().getPluginManager().callEvent(
                 new BungeeFastLoginPremiumToggleEvent(playerProfile, reason));
         sendMessage("remove-premium");
@@ -89,8 +89,8 @@ public class AsyncToggleMessage implements Runnable {
 
         playerProfile.setPremium(true);
         core.getStorage().save(playerProfile);
-        PremiumToggleReason reason = (!isPlayerSender || !sender.getName().equalsIgnoreCase(playerProfile.getName())) ?
+        PremiumToggleReason reason = (!isPlayerSender || !sender.getName().equalsIgnoreCase(playerProfile.getName()))
-                PremiumToggleReason.COMMAND_OTHER : PremiumToggleReason.COMMAND_SELF;
+            ? PremiumToggleReason.COMMAND_OTHER : PremiumToggleReason.COMMAND_SELF;
         core.getPlugin().getProxy().getPluginManager().callEvent(
                 new BungeeFastLoginPremiumToggleEvent(playerProfile, reason));
         sendMessage("add-premium");

checkstyle.xml

@@ -0,0 +1,224 @@
+<?xml version="1.0"?>
+<!--
+
+    SPDX-License-Identifier: MIT
+
+    The MIT License (MIT)
+
+    Copyright (c) 2015-2022 games647 and contributors
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all
+    copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+    SOFTWARE.
+
+-->
+<!DOCTYPE module PUBLIC
+          "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
+          "https://checkstyle.org/dtds/configuration_1_3.dtd">
+
+<!--
+
+  Checkstyle configuration that checks the sun coding conventions from:
+
+    - the Java Language Specification at
+      https://docs.oracle.com/javase/specs/jls/se11/html/index.html
+
+    - the Sun Code Conventions at https://www.oracle.com/java/technologies/javase/codeconventions-contents.html
+
+    - the Javadoc guidelines at
+      https://www.oracle.com/technical-resources/articles/java/javadoc-tool.html
+
+    - the JDK Api documentation https://docs.oracle.com/en/java/javase/11/
+
+    - some best practices
+
+  Checkstyle is very configurable. Be sure to read the documentation at
+  https://checkstyle.org (or in your downloaded distribution).
+
+  Most Checks are configurable, be sure to consult the documentation.
+
+  To completely disable a check, just comment it out or delete it from the file.
+  To suppress certain violations please review suppression filters.
+
+  Finally, it is worth reading the documentation.
+
+-->
+
+<module name="Checker">
+  <!--
+      If you set the basedir property below, then all reported file
+      names will be relative to the specified directory. See
+      https://checkstyle.org/config.html#Checker
+
+      <property name="basedir" value="${basedir}"/>
+  -->
+  <property name="severity" value="error"/>
+
+  <property name="fileExtensions" value="java, properties, xml"/>
+
+  <!-- Excludes all 'module-info.java' files              -->
+  <!-- See https://checkstyle.org/config_filefilters.html -->
+  <module name="BeforeExecutionExclusionFileFilter">
+    <property name="fileNamePattern" value="module\-info\.java$"/>
+  </module>
+
+  <!-- https://checkstyle.org/config_filters.html#SuppressionFilter -->
+  <module name="SuppressionFilter">
+    <property name="file" value="${org.checkstyle.sun.suppressionfilter.config}"
+              default="checkstyle-suppressions.xml" />
+    <property name="optional" value="true"/>
+  </module>
+
+  <!-- Checks that a package-info.java file exists for each package.     -->
+  <!-- See https://checkstyle.org/config_javadoc.html#JavadocPackage -->
+  <!--<module name="JavadocPackage"/>-->
+
+  <!-- Checks whether files end with a new line.                        -->
+  <!-- See https://checkstyle.org/config_misc.html#NewlineAtEndOfFile -->
+  <module name="NewlineAtEndOfFile"/>
+
+  <!-- Checks that property files contain the same keys.         -->
+  <!-- See https://checkstyle.org/config_misc.html#Translation -->
+  <module name="Translation"/>
+
+  <!-- Checks for Size Violations.                    -->
+  <!-- See https://checkstyle.org/config_sizes.html -->
+  <module name="FileLength"/>
+  <module name="LineLength">
+    <property name="max" value="120"/>
+    <property name="fileExtensions" value="java"/>
+  </module>
+
+  <!-- Checks for whitespace                               -->
+  <!-- See https://checkstyle.org/config_whitespace.html -->
+  <module name="FileTabCharacter"/>
+
+  <!-- Miscellaneous other checks.                   -->
+  <!-- See https://checkstyle.org/config_misc.html -->
+  <module name="RegexpSingleline">
+    <property name="format" value="\s+$"/>
+    <property name="minimum" value="0"/>
+    <property name="maximum" value="0"/>
+    <property name="message" value="Line has trailing spaces."/>
+  </module>
+
+  <!-- Checks for Headers                                -->
+  <!-- See https://checkstyle.org/config_header.html   -->
+  <!-- <module name="Header"> -->
+  <!--   <property name="headerFile" value="${checkstyle.header.file}"/> -->
+  <!--   <property name="fileExtensions" value="java"/> -->
+  <!-- </module> -->
+
+  <module name="TreeWalker">
+
+    <!-- Checks for Javadoc comments.                     -->
+    <!-- See https://checkstyle.org/config_javadoc.html -->
+    <module name="InvalidJavadocPosition"/>
+    <module name="JavadocMethod"/>
+    <!--<module name="JavadocType"/>-->
+    <!--<module name="JavadocVariable"/>-->
+    <!--<module name="JavadocStyle"/>-->
+    <!--<module name="MissingJavadocMethod"/>-->
+
+    <!-- Checks for Naming Conventions.                  -->
+    <!-- See https://checkstyle.org/config_naming.html -->
+    <module name="ConstantName"/>
+    <module name="LocalFinalVariableName"/>
+    <module name="LocalVariableName"/>
+    <module name="MemberName"/>
+    <module name="MethodName"/>
+    <module name="PackageName"/>
+    <module name="ParameterName"/>
+    <module name="StaticVariableName"/>
+    <module name="TypeName"/>
+
+    <!-- Checks for imports                              -->
+    <!-- See https://checkstyle.org/config_imports.html -->
+    <module name="AvoidStarImport"/>
+    <module name="IllegalImport"/> <!-- defaults to sun.* packages -->
+    <module name="RedundantImport"/>
+    <module name="UnusedImports">
+      <property name="processJavadoc" value="false"/>
+    </module>
+
+    <!-- Checks for Size Violations.                    -->
+    <!-- See https://checkstyle.org/config_sizes.html -->
+    <module name="MethodLength"/>
+    <module name="ParameterNumber"/>
+
+    <!-- Checks for whitespace                               -->
+    <!-- See https://checkstyle.org/config_whitespace.html -->
+    <module name="EmptyForIteratorPad"/>
+    <module name="GenericWhitespace"/>
+    <module name="MethodParamPad"/>
+    <module name="NoWhitespaceAfter"/>
+    <module name="NoWhitespaceBefore"/>
+    <module name="OperatorWrap"/>
+    <module name="ParenPad"/>
+    <module name="TypecastParenPad"/>
+    <module name="WhitespaceAfter"/>
+    <module name="WhitespaceAround"/>
+
+    <!-- Modifier Checks                                    -->
+    <!-- See https://checkstyle.org/config_modifier.html -->
+    <module name="ModifierOrder"/>
+    <module name="RedundantModifier"/>
+
+    <!-- Checks for blocks. You know, those {}'s         -->
+    <!-- See https://checkstyle.org/config_blocks.html -->
+    <module name="AvoidNestedBlocks"/>
+    <module name="EmptyBlock"/>
+    <module name="LeftCurly"/>
+    <module name="NeedBraces"/>
+    <module name="RightCurly"/>
+
+    <!-- Checks for common coding problems               -->
+    <!-- See https://checkstyle.org/config_coding.html -->
+    <module name="EmptyStatement"/>
+    <module name="EqualsHashCode"/>
+    <module name="IllegalInstantiation"/>
+    <module name="InnerAssignment"/>
+    <!--<module name="MagicNumber"/>-->
+    <module name="MissingSwitchDefault"/>
+    <module name="MultipleVariableDeclarations"/>
+    <module name="SimplifyBooleanExpression"/>
+    <module name="SimplifyBooleanReturn"/>
+
+    <!-- Checks for class design                         -->
+    <!-- See https://checkstyle.org/config_design.html -->
+    <!--<module name="DesignForExtension"/>-->
+    <module name="FinalClass"/>
+    <module name="HideUtilityClassConstructor"/>
+    <module name="InterfaceIsType"/>
+
+    <!-- Miscellaneous other checks.                   -->
+    <!-- See https://checkstyle.org/config_misc.html -->
+    <module name="ArrayTypeStyle"/>
+    <!--<module name="FinalParameters"/>-->
+<!--    <module name="TodoComment"/>-->
+    <module name="UpperEll"/>
+
+    <!-- https://checkstyle.org/config_filters.html#SuppressionXpathFilter -->
+    <module name="SuppressionXpathFilter">
+      <property name="file" value="${org.checkstyle.sun.suppressionxpathfilter.config}"
+                default="checkstyle-xpath-suppressions.xml" />
+      <property name="optional" value="true"/>
+    </module>
+
+  </module>
+
+</module>

core/src/main/java/com/github/games647/fastlogin/core/CommonUtil.java

@@ -37,7 +37,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.slf4j.jul.JDK14LoggerAdapter;
 
-public class CommonUtil {
+public final class CommonUtil {
 
     private static final char COLOR_CHAR = '&';
     private static final char TRANSLATED_CHAR = '§';

core/src/main/java/com/github/games647/fastlogin/core/StoredProfile.java

@@ -114,9 +114,18 @@ public class StoredProfile extends Profile {
 
     @Override
     public synchronized boolean equals(Object o) {
-        if (this == o) return true;
+        if (this == o) {
-        if (!(o instanceof StoredProfile that)) return false;
+            return true;
-        if (!super.equals(o)) return false;
+        }
+
+        if (!(o instanceof StoredProfile that)) {
+            return false;
+        }
+
+        if (!super.equals(o)) {
+            return false;
+        }
+
         return rowId == that.rowId && premium == that.premium
             && Objects.equals(lastIp, that.lastIp) && lastLogin.equals(that.lastLogin);
     }
@@ -128,11 +137,11 @@ public class StoredProfile extends Profile {
 
     @Override
     public synchronized String toString() {
-        return this.getClass().getSimpleName() + '{' +
+        return this.getClass().getSimpleName() + '{'
-                "rowId=" + rowId +
+            + "rowId=" + rowId
-                ", premium=" + premium +
+            + ", premium=" + premium
-                ", lastIp='" + lastIp + '\'' +
+            + ", lastIp='" + lastIp + '\''
-                ", lastLogin=" + lastLogin +
+            + ", lastLogin=" + lastLogin
-                "} " + super.toString();
+            + "} " + super.toString();
     }
 }

core/src/main/java/com/github/games647/fastlogin/core/antibot/ProxyAgnosticMojangResolver.java

@@ -36,25 +36,29 @@ import java.util.Optional;
 
 /**
  * An extension to {@link MojangResolver} which allows connection using transparent reverse proxies.
- * The significant difference is that unlike MojangResolver from the CraftAPI implementation, which sends the "ip" parameter
+ * The significant difference is that unlike MojangResolver from the CraftAPI implementation, which sends the
- * when the hostIp parameter is an IPv4 address, but skips it for IPv6, this implementation leaves out the "ip" parameter
+ * "ip" parameter when the hostIp parameter is an IPv4 address, but skips it for IPv6, this implementation leaves out
- * also for IPv4, effectively enabling transparent proxies to work.
+ * the "ip" parameter also for IPv4, effectively enabling transparent proxies to work.
+ *
  * @author games647, Enginecrafter77
  */
 public class ProxyAgnosticMojangResolver extends MojangResolver {
+
+    private static final String HOST = "sessionserver.mojang.com";
+
     /**
      * A formatting string containing a URL used to call the {@code hasJoined} method on mojang session servers.
-	 *
+     * <p>
      * Formatting parameters:
      * 1. The username of the player in question
      * 2. The serverId of this server
      */
-	public static final String MOJANG_SESSIONSERVER_HASJOINED_CALL_URLFMT = "https://sessionserver.mojang.com/session/minecraft/hasJoined?username=%s&serverId=%s";
+    public static final String ENDPOINT = "https://" + HOST + "/session/minecraft/hasJoined?username=%s&serverId=%s";
 
     @Override
-	public Optional<Verification> hasJoined(String username, String serverHash, InetAddress hostIp) throws IOException
+    public Optional<Verification> hasJoined(String username, String serverHash, InetAddress hostIp)
-	{
+        throws IOException {
-		String url = String.format(MOJANG_SESSIONSERVER_HASJOINED_CALL_URLFMT, username, serverHash);
+        String url = String.format(ENDPOINT, username, serverHash);
 
         HttpURLConnection conn = this.getConnection(url);
         int responseCode = conn.getResponseCode();
@@ -63,15 +67,15 @@ public class ProxyAgnosticMojangResolver extends MojangResolver {
 
         // Mojang session servers send HTTP 204 (NO CONTENT) when the authentication seems invalid
         // If that's not our case, the authentication is valid, and so we can parse the response.
-		if(responseCode != HttpURLConnection.HTTP_NO_CONTENT)
+        if (responseCode != HttpURLConnection.HTTP_NO_CONTENT) {
             verification = this.parseRequest(conn, this::parseVerification);
+        }
 
         return Optional.ofNullable(verification);
     }
 
     // Functional implementation of InputStreamAction, used in hasJoined method in parseRequest call
-	protected Verification parseVerification(InputStream input) throws IOException
+    protected Verification parseVerification(InputStream input) throws IOException {
-	{
         return this.readJson(input, Verification.class);
     }
 }

core/src/main/java/com/github/games647/fastlogin/core/antibot/TickingRateLimiter.java

@@ -113,7 +113,7 @@ public class TickingRateLimiter implements RateLimiter {
         private final long expireTime;
         private int count;
 
-        public TimeRecord(long firstMinuteRecord, long expireTime) {
+        TimeRecord(long firstMinuteRecord, long expireTime) {
             this.firstMinuteRecord = firstMinuteRecord;
             this.expireTime = expireTime;
             this.count = 1;

core/src/main/java/com/github/games647/fastlogin/core/hooks/bedrock/BedrockService.java

@@ -74,12 +74,12 @@ public abstract class BedrockService<B> {
                 "Could not check whether Bedrock Player {}'s name conflicts a premium Java player's name.",
                 username);
 
-            kickPlayer(source, username, "Could not check if your name conflicts an existing " +
+            kickPlayer(source, username, "Could not check if your name conflicts an existing "
-                "premium Java account's name. This is usually a serverside error.");
+                + "premium Java account's name. This is usually a serverside error.");
         } catch (RateLimitException rateLimitException) {
             core.getPlugin().getLog().warn("Mojang API rate limit hit");
-            kickPlayer(source, username, "Could not check if your name conflicts an existing premium " +
+            kickPlayer(source, username, "Could not check if your name conflicts an existing premium "
-                "Java account's name. Try again in a few minutes");
+                + "Java account's name. Try again in a few minutes");
         }
 
         if (premiumUUID.isPresent()) {

core/src/main/java/com/github/games647/fastlogin/core/hooks/bedrock/FloodgateService.java

@@ -60,12 +60,16 @@ public class FloodgateService extends BedrockService<FloodgatePlayer> {
      */
     public boolean isValidFloodgateConfigString(String key) {
         String value = core.getConfig().get(key).toString().toLowerCase(Locale.ENGLISH);
-        if (!"true".equals(value) && !"linked".equals(value) && !"false".equals(value) && !"no-conflict".equals(value)) {
+        switch (value) {
+            case "true":
+            case "linked":
+            case "false":
+            case "no-conflict":
+                return true;
+            default:
                 core.getPlugin().getLog().error("Invalid value detected for {} in FastLogin/config.yml.", key);
                 return false;
         }
-
-        return true;
     }
 
     @Override

core/src/main/java/com/github/games647/fastlogin/core/message/ChangePremiumMessage.java

@@ -79,10 +79,10 @@ public class ChangePremiumMessage implements ChannelMessage {
 
     @Override
     public String toString() {
-        return this.getClass().getSimpleName() + '{' +
+        return this.getClass().getSimpleName() + '{'
-                "playerName='" + playerName + '\'' +
+            + "playerName='" + playerName + '\''
-                ", shouldEnable=" + willEnable +
+            + ", shouldEnable=" + willEnable
-                ", isSourceInvoker=" + isSourceInvoker +
+            + ", isSourceInvoker=" + isSourceInvoker
-                '}';
+            + '}';
     }
 }

core/src/main/java/com/github/games647/fastlogin/core/message/LoginActionMessage.java

@@ -92,11 +92,11 @@ public class LoginActionMessage implements ChannelMessage {
 
     @Override
     public String toString() {
-        return this.getClass().getSimpleName() + '{' +
+        return this.getClass().getSimpleName() + '{'
-                "type='" + type + '\'' +
+            + "type='" + type + '\''
-                ", playerName='" + playerName + '\'' +
+            + ", playerName='" + playerName + '\''
-                ", proxyId=" + proxyId +
+            + ", proxyId=" + proxyId
-                '}';
+            + '}';
     }
 
     public enum Type {

core/src/main/java/com/github/games647/fastlogin/core/shared/FastLoginCore.java

@@ -122,7 +122,8 @@ public class FastLoginCore<P extends C, C, T extends PlatformPlugin<C>> {
         }
 
         // Initialize the resolver based on the config parameter
-        this.resolver = this.config.getBoolean("useProxyAgnosticResolver", false) ? new ProxyAgnosticMojangResolver() : new MojangResolver();
+        this.resolver = this.config.getBoolean("useProxyAgnosticResolver", false)
+            ? new ProxyAgnosticMojangResolver() : new MojangResolver();
 
         antiBot = createAntiBotService(config.getSection("anti-bot"));
         Set<Proxy> proxies = config.getStringList("proxies")
@@ -191,7 +192,7 @@ public class FastLoginCore<P extends C, C, T extends PlatformPlugin<C>> {
             config = configProvider.load(reader, defaults);
         }
 
-        // explicitly add keys here, because Configuration.getKeys doesn't return the keys from the default configuration
+        // explicitly add keys here, because Configuration.getKeys doesn't return the keys from the default config
         for (String key : defaults.getKeys()) {
             config.set(key, config.get(key));
         }
@@ -244,9 +245,13 @@ public class FastLoginCore<P extends C, C, T extends PlatformPlugin<C>> {
             boolean useSSL = config.get("useSSL", false);
 
             if (useSSL) {
-                databaseConfig.addDataSourceProperty("allowPublicKeyRetrieval", config.getBoolean("allowPublicKeyRetrieval", false));
+                boolean publicKeyRetrieval = config.getBoolean("allowPublicKeyRetrieval", false);
-                databaseConfig.addDataSourceProperty("serverRSAPublicKeyFile", config.getString("ServerRSAPublicKeyFile"));
+                String rsaPublicKeyFile = config.getString("ServerRSAPublicKeyFile");
-                databaseConfig.addDataSourceProperty("sslMode", config.getString("sslMode", "Required"));
+                String sslMode = config.getString("sslMode", "Required");
+
+                databaseConfig.addDataSourceProperty("allowPublicKeyRetrieval", publicKeyRetrieval);
+                databaseConfig.addDataSourceProperty("serverRSAPublicKeyFile", rsaPublicKeyFile);
+                databaseConfig.addDataSourceProperty("sslMode", sslMode);
             }
 
             databaseConfig.setUsername(config.get("username", ""));
@@ -270,8 +275,8 @@ public class FastLoginCore<P extends C, C, T extends PlatformPlugin<C>> {
         } catch (ClassNotFoundException notFoundEx) {
             Logger log = plugin.getLog();
             log.warn("This driver {} is not supported on this platform", className);
-            log.warn("Please choose either MySQL (Spigot, BungeeCord), SQLite (Spigot, Sponge) or " +
+            log.warn("Please choose either MySQL (Spigot, BungeeCord), SQLite (Spigot, Sponge) or "
-                "MariaDB (Sponge, Velocity)", notFoundEx);
+                + "MariaDB (Sponge, Velocity)", notFoundEx);
         }
 
         return false;

core/src/main/java/com/github/games647/fastlogin/core/shared/JoinManagement.java

@@ -106,9 +106,9 @@ public abstract class JoinManagement<P extends C, C, S extends LoginSource> {
                 }
             }
         } catch (RateLimitException rateLimitEx) {
-            core.getPlugin().getLog().error("Mojang's rate limit reached for {}. The public IPv4 address of this" +
+            core.getPlugin().getLog().error("Mojang's rate limit reached for {}. The public IPv4 address of this"
-                    " server issued more than 600 Name -> UUID requests within 10 minutes. After those 10" +
+                + " server issued more than 600 Name -> UUID requests within 10 minutes. After those 10"
-                    " minutes we can make requests again.", username);
+                + " minutes we can make requests again.", username);
         } catch (Exception ex) {
             core.getPlugin().getLog().error("Failed to check premium state for {}", username, ex);
             core.getPlugin().getLog().error("Failed to check premium state of {}", username, ex);

core/src/main/java/com/github/games647/fastlogin/core/storage/MySQLStorage.java

@@ -31,7 +31,7 @@ import com.zaxxer.hikari.HikariConfig;
 public class MySQLStorage extends SQLStorage {
 
     public MySQLStorage(FastLoginCore<?, ?, ?> core, String driver, String host, int port, String database,
-                        HikariConfig config,boolean useSSL) {
+                        HikariConfig config, boolean useSSL) {
         super(core,
                 buildJDBCUrl(driver, host, port, database),
                 setParams(config, useSSL));

pom.xml

@@ -125,6 +125,33 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>3.1.2</version>
+                <configuration>
+                    <configLocation>checkstyle.xml</configLocation>
+                    <consoleOutput>true</consoleOutput>
+                    <failsOnError>false</failsOnError>
+                    <linkXRef>false</linkXRef>
+                </configuration>
+                <dependencies>
+                    <dependency>
+                        <groupId>com.puppycrawl.tools</groupId>
+                        <artifactId>checkstyle</artifactId>
+                        <version>10.3.1</version>
+                    </dependency>
+                </dependencies>
+                <executions>
+                    <execution>
+                        <id>validate</id>
+                        <phase>validate</phase>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
 
         <resources>

velocity/src/main/java/com/github/games647/fastlogin/velocity/FastLoginVelocity.java

@@ -46,6 +46,7 @@ import com.velocitypowered.api.plugin.Plugin;
 import com.velocitypowered.api.plugin.annotation.DataDirectory;
 import com.velocitypowered.api.proxy.Player;
 import com.velocitypowered.api.proxy.ProxyServer;
+import com.velocitypowered.api.proxy.messages.ChannelRegistrar;
 import com.velocitypowered.api.proxy.messages.MinecraftChannelIdentifier;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
 
@@ -73,7 +74,7 @@ public class FastLoginVelocity implements PlatformPlugin<CommandSource> {
     private final Path dataDirectory;
     private final Logger logger;
     private final ConcurrentMap<InetSocketAddress, VelocityLoginSession> session = new MapMaker().weakKeys().makeMap();
-    private static final String PROXY_ID_fILE = "proxyId.txt";
+    private static final String PROXY_ID_FILE = "proxyId.txt";
 
     private FastLoginCore<Player, CommandSource, FastLoginVelocity> core;
     private AsyncScheduler scheduler;
@@ -98,8 +99,10 @@ public class FastLoginVelocity implements PlatformPlugin<CommandSource> {
 
         server.getEventManager().register(this, new ConnectListener(this, core.getAntiBot()));
         server.getEventManager().register(this, new PluginMessageListener(this));
-        server.getChannelRegistrar().register(MinecraftChannelIdentifier.create(getName(), ChangePremiumMessage.CHANGE_CHANNEL));
+
-        server.getChannelRegistrar().register(MinecraftChannelIdentifier.create(getName(), SuccessMessage.SUCCESS_CHANNEL));
+        ChannelRegistrar channelRegistry = server.getChannelRegistrar();
+        channelRegistry.register(MinecraftChannelIdentifier.create(getName(), ChangePremiumMessage.CHANGE_CHANNEL));
+        channelRegistry.register(MinecraftChannelIdentifier.create(getName(), SuccessMessage.SUCCESS_CHANNEL));
     }
 
     @Subscribe
@@ -167,7 +170,7 @@ public class FastLoginVelocity implements PlatformPlugin<CommandSource> {
     }
 
     private void loadOrGenerateProxyId() {
-        Path idFile = dataDirectory.resolve(PROXY_ID_fILE);
+        Path idFile = dataDirectory.resolve(PROXY_ID_FILE);
         boolean shouldGenerate = false;
 
         if (Files.exists(idFile)) {
@@ -182,7 +185,8 @@ public class FastLoginVelocity implements PlatformPlugin<CommandSource> {
                 logger.error("Unable to load proxy id from '{}'", idFile.toAbsolutePath());
                 logger.error("Detailed exception:", e);
             } catch (IllegalArgumentException e) {
-                logger.error("'{}' contains an invalid uuid! FastLogin will not work without a valid id.", idFile.toAbsolutePath());
+                Path filePath = idFile.toAbsolutePath();
+                logger.error("'{}' contains an invalid uuid! FastLogin will not work without a valid id.", filePath);
             }
         } else {
             shouldGenerate = true;

velocity/src/main/java/com/github/games647/fastlogin/velocity/VelocityLoginSession.java

@@ -58,10 +58,10 @@ public class VelocityLoginSession extends LoginSession {
 
     @Override
     public synchronized String toString() {
-        return this.getClass().getSimpleName() + '{' +
+        return this.getClass().getSimpleName() + '{'
-                "alreadySaved=" + alreadySaved +
+            + "alreadySaved=" + alreadySaved
-                ", alreadyLogged=" + alreadyLogged +
+            + ", alreadyLogged=" + alreadyLogged
-                ", registered=" + registered +
+            + ", registered=" + registered
-                "} " + super.toString();
+            + "} " + super.toString();
     }
 }

velocity/src/main/java/com/github/games647/fastlogin/velocity/event/VelocityFastLoginAutoLoginEvent.java

@@ -67,7 +67,7 @@ public class VelocityFastLoginAutoLoginEvent
 
     @Override
     public GenericResult getResult() {
-        return cancelled ? GenericResult.denied(): GenericResult.allowed();
+        return cancelled ? GenericResult.denied() : GenericResult.allowed();
     }
 
     @Override

velocity/src/main/java/com/github/games647/fastlogin/velocity/listener/ConnectListener.java

@@ -92,7 +92,9 @@ public class ConnectListener {
                 break;
             case Continue:
             default:
-                Runnable asyncPremiumCheck = new AsyncPremiumCheck(plugin, connection, username, continuation, preLoginEvent);
+                Runnable asyncPremiumCheck = new AsyncPremiumCheck(
+                    plugin, connection, username, continuation, preLoginEvent
+                );
                 plugin.getScheduler().runAsync(asyncPremiumCheck);
                 break;
         }
@@ -118,8 +120,8 @@ public class ConnectListener {
             }
 
             if (!plugin.getCore().getConfig().get("forwardSkin", true)) {
-                List<Property> skinFreeProp = removeSkin(event.getGameProfile().getProperties());
+                List<Property> newProp = removeSkin(event.getGameProfile().getProperties());
-                event.setGameProfile(event.getGameProfile().withProperties(skinFreeProp));
+                event.setGameProfile(event.getGameProfile().withProperties(newProp));
             }
         }
     }
@@ -127,9 +129,10 @@ public class ConnectListener {
     private List<GameProfile.Property> removeSkin(Collection<Property> oldProperties) {
         List<GameProfile.Property> newProperties = new ArrayList<>(oldProperties.size());
         for (GameProfile.Property property : oldProperties) {
-            if (!"textures".equals(property.getName()))
+            if (!"textures".equals(property.getName())) {
                 newProperties.add(property);
             }
+        }
 
         return newProperties;
     }

velocity/src/main/java/com/github/games647/fastlogin/velocity/listener/PluginMessageListener.java

@@ -55,8 +55,9 @@ public class PluginMessageListener {
     public PluginMessageListener(FastLoginVelocity plugin) {
         this.plugin = plugin;
 
-        this.successChannel = MinecraftChannelIdentifier.create(plugin.getName(), SuccessMessage.SUCCESS_CHANNEL).getId();
+        String prefix = plugin.getName();
-        this.changeChannel = MinecraftChannelIdentifier.create(plugin.getName(), ChangePremiumMessage.CHANGE_CHANNEL).getId();
+        this.successChannel = MinecraftChannelIdentifier.create(prefix, SuccessMessage.SUCCESS_CHANNEL).getId();
+        this.changeChannel = MinecraftChannelIdentifier.create(prefix, ChangePremiumMessage.CHANGE_CHANNEL).getId();
     }
 
     @Subscribe
@@ -95,7 +96,8 @@ public class PluginMessageListener {
             String playerName = changeMessage.getPlayerName();
             boolean isSourceInvoker = changeMessage.isSourceInvoker();
             if (changeMessage.shouldEnable()) {
-                if (playerName.equals(forPlayer.getUsername()) && plugin.getCore().getConfig().get("premium-warning", true)
+                Boolean premiumWarning = plugin.getCore().getConfig().get("premium-warning", true);
+                if (playerName.equals(forPlayer.getUsername()) && premiumWarning
                     && !core.getPendingConfirms().contains(forPlayer.getUniqueId())) {
                     String message = core.getMessage("premium-warning");
                     forPlayer.sendMessage(LegacyComponentSerializer.legacyAmpersand().deserialize(message));
@@ -114,7 +116,7 @@ public class PluginMessageListener {
     }
 
     private void onSuccessMessage(Player forPlayer) {
-        if (forPlayer.isOnlineMode()){
+        if (forPlayer.isOnlineMode()) {
             //bukkit module successfully received and force logged in the user
             //update only on success to prevent corrupt data
             VelocityLoginSession loginSession = plugin.getSession().get(forPlayer.getRemoteAddress());

velocity/src/main/java/com/github/games647/fastlogin/velocity/task/AsyncPremiumCheck.java

@@ -49,7 +49,8 @@ public class AsyncPremiumCheck extends JoinManagement<Player, CommandSource, Vel
     private final PreLoginEvent preLoginEvent;
     private final InboundConnection connection;
 
-    public AsyncPremiumCheck(FastLoginVelocity plugin, InboundConnection connection, String username, Continuation continuation, PreLoginEvent preLoginEvent) {
+    public AsyncPremiumCheck(FastLoginVelocity plugin, InboundConnection connection, String username,
+                             Continuation continuation, PreLoginEvent preLoginEvent) {
         super(plugin.getCore(), plugin.getCore().getAuthPluginHook(), plugin.getBedrockService());
         this.plugin = plugin;
         this.connection = connection;
@@ -69,7 +70,8 @@ public class AsyncPremiumCheck extends JoinManagement<Player, CommandSource, Vel
     }
 
     @Override
-    public FastLoginPreLoginEvent callFastLoginPreLoginEvent(String username, VelocityLoginSource source, StoredProfile profile) {
+    public FastLoginPreLoginEvent callFastLoginPreLoginEvent(String username, VelocityLoginSource source,
+                                                             StoredProfile profile) {
         VelocityFastLoginPreLoginEvent event = new VelocityFastLoginPreLoginEvent(username, source, profile);
         try {
             return plugin.getProxy().getEventManager().fire(event).get();
@@ -86,7 +88,8 @@ public class AsyncPremiumCheck extends JoinManagement<Player, CommandSource, Vel
     public void requestPremiumLogin(VelocityLoginSource source, StoredProfile profile,
                                     String username, boolean registered) {
         source.enableOnlinemode();
-        plugin.getSession().put(source.getConnection().getRemoteAddress(), new VelocityLoginSession(username, registered, profile));
+        VelocityLoginSession session = new VelocityLoginSession(username, registered, profile);
+        plugin.getSession().put(source.getConnection().getRemoteAddress(), session);
 
         String ip = source.getAddress().getAddress().getHostAddress();
         plugin.getCore().getPendingLogin().put(ip + username, new Object());
@@ -94,6 +97,7 @@ public class AsyncPremiumCheck extends JoinManagement<Player, CommandSource, Vel
 
     @Override
     public void startCrackedSession(VelocityLoginSource source, StoredProfile profile, String username) {
-        plugin.getSession().put(source.getConnection().getRemoteAddress(), new VelocityLoginSession(username, false, profile));
+        VelocityLoginSession session = new VelocityLoginSession(username, false, profile);
+        plugin.getSession().put(source.getConnection().getRemoteAddress(), session);
     }
 }

velocity/src/main/java/com/github/games647/fastlogin/velocity/task/AsyncToggleMessage.java

@@ -31,6 +31,7 @@ import com.github.games647.fastlogin.core.shared.event.FastLoginPremiumToggleEve
 import com.github.games647.fastlogin.velocity.FastLoginVelocity;
 import com.github.games647.fastlogin.velocity.event.VelocityFastLoginPremiumToggleEvent;
 import com.velocitypowered.api.command.CommandSource;
+import com.velocitypowered.api.proxy.ConsoleCommandSource;
 import com.velocitypowered.api.proxy.Player;
 
 import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
@@ -51,11 +52,12 @@ public class AsyncToggleMessage implements Runnable {
         this.targetPlayer = playerName;
         this.toPremium = toPremium;
         this.isPlayerSender = playerSender;
-        if (sender instanceof Player)
+        if (sender instanceof Player) {
             senderName = ((Player) sender).getUsername();
-        else
+        } else {
             senderName = "";
         }
+    }
 
     @Override
     public void run() {
@@ -77,8 +79,8 @@ public class AsyncToggleMessage implements Runnable {
         playerProfile.setPremium(false);
         playerProfile.setId(null);
         core.getStorage().save(playerProfile);
-        PremiumToggleReason reason = (!isPlayerSender || !senderName.equalsIgnoreCase(playerProfile.getName())) ?
+        PremiumToggleReason reason = (!isPlayerSender || !senderName.equalsIgnoreCase(playerProfile.getName()))
-                PremiumToggleReason.COMMAND_OTHER : PremiumToggleReason.COMMAND_SELF;
+            ? PremiumToggleReason.COMMAND_OTHER : PremiumToggleReason.COMMAND_SELF;
         core.getPlugin().getProxy().getEventManager().fire(
             new VelocityFastLoginPremiumToggleEvent(playerProfile, reason));
         sendMessage("remove-premium");
@@ -93,7 +95,8 @@ public class AsyncToggleMessage implements Runnable {
 
         playerProfile.setPremium(true);
         core.getStorage().save(playerProfile);
-        PremiumToggleReason reason = (!isPlayerSender || !senderName.equalsIgnoreCase(playerProfile.getName())) ?
+        PremiumToggleReason reason = (!isPlayerSender || !senderName.equalsIgnoreCase(playerProfile.getName()))
+            ?
             PremiumToggleReason.COMMAND_OTHER : PremiumToggleReason.COMMAND_SELF;
         core.getPlugin().getProxy().getEventManager().fire(
             new VelocityFastLoginPremiumToggleEvent(playerProfile, reason));
@@ -105,7 +108,8 @@ public class AsyncToggleMessage implements Runnable {
         if (isPlayerSender) {
             sender.sendMessage(LegacyComponentSerializer.legacyAmpersand().deserialize(message));
         } else {
-            core.getPlugin().getProxy().getConsoleCommandSource().sendMessage(LegacyComponentSerializer.legacyAmpersand().deserialize(message));
+            ConsoleCommandSource console = core.getPlugin().getProxy().getConsoleCommandSource();
+            console.sendMessage(LegacyComponentSerializer.legacyAmpersand().deserialize(message));
         }
     }
 }

velocity/src/main/java/com/github/games647/fastlogin/velocity/task/ForceLoginTask.java

@@ -52,7 +52,8 @@ public class ForceLoginTask
     private final boolean forcedOnlineMode;
 
     public ForceLoginTask(FastLoginCore<Player, CommandSource, FastLoginVelocity> core,
-                          Player player, RegisteredServer server, VelocityLoginSession session, boolean forcedOnlineMode) {
+                          Player player, RegisteredServer server, VelocityLoginSession session,
+                          boolean forcedOnlineMode) {
         super(core, player, session);
 
         this.server = server;