diff --git a/.codeclimate.yml b/.codeclimate.yml
index ee4961678..9c4405f85 100644
--- a/.codeclimate.yml
+++ b/.codeclimate.yml
@@ -25,4 +25,6 @@ exclude_paths:
 - 'src/main/java/fr/xephi/authme/mail/OAuth2SaslClient.java'
 - 'src/main/java/fr/xephi/authme/mail/OAuth2SaslClientFactory.java'
 - 'src/main/java/fr/xephi/authme/security/crypts/BCryptService.java'
+- 'src/main/java/fr/xephi/authme/security/crypts/PHPBB.java'
 - 'src/main/java/fr/xephi/authme/security/crypts/WHIRLPOOL.java'
+- 'src/main/java/fr/xephi/authme/security/crypts/WORDPRESS.java'
diff --git a/src/main/java/fr/xephi/authme/api/API.java b/src/main/java/fr/xephi/authme/api/API.java
index d05fbe6b9..75e746e6d 100644
--- a/src/main/java/fr/xephi/authme/api/API.java
+++ b/src/main/java/fr/xephi/authme/api/API.java
@@ -23,6 +23,7 @@ import javax.inject.Inject;
  * @deprecated Use {@link NewAPI}
  */
 @Deprecated
+@SuppressWarnings({"checkstyle:AbbreviationAsWordInName"}) // Justification: Class name cannot be changed anymore
 public class API {
 
     private static AuthMe instance;
diff --git a/src/main/java/fr/xephi/authme/api/NewAPI.java b/src/main/java/fr/xephi/authme/api/NewAPI.java
index d4f34b2c6..2193f64c0 100644
--- a/src/main/java/fr/xephi/authme/api/NewAPI.java
+++ b/src/main/java/fr/xephi/authme/api/NewAPI.java
@@ -24,6 +24,7 @@ import java.util.List;
  * NewAPI authmeApi = AuthMe.getApi();
  * </code>
  */
+@SuppressWarnings({"checkstyle:AbbreviationAsWordInName"}) // Justification: Class name cannot be changed anymore
 public class NewAPI {
 
     private static NewAPI singleton;
diff --git a/src/main/java/fr/xephi/authme/command/CommandDescription.java b/src/main/java/fr/xephi/authme/command/CommandDescription.java
index 18463bcaa..57b92d735 100644
--- a/src/main/java/fr/xephi/authme/command/CommandDescription.java
+++ b/src/main/java/fr/xephi/authme/command/CommandDescription.java
@@ -19,7 +19,7 @@ import static java.util.Arrays.asList;
  * {@code /authme} has a child whose label is {@code "register"}, then {@code /authme register} is the command that
  * the child defines.
  */
-public class CommandDescription {
+public final class CommandDescription {
 
     /**
      * Defines the labels to execute the command. For example, if labels are "register" and "r" and the parent is
diff --git a/src/main/java/fr/xephi/authme/command/executable/captcha/CaptchaCommand.java b/src/main/java/fr/xephi/authme/command/executable/captcha/CaptchaCommand.java
index c5756cda9..d7150c890 100644
--- a/src/main/java/fr/xephi/authme/command/executable/captcha/CaptchaCommand.java
+++ b/src/main/java/fr/xephi/authme/command/executable/captcha/CaptchaCommand.java
@@ -3,7 +3,6 @@ package fr.xephi.authme.command.executable.captcha;
 import fr.xephi.authme.command.PlayerCommand;
 import fr.xephi.authme.data.CaptchaManager;
 import fr.xephi.authme.data.auth.PlayerCache;
-import fr.xephi.authme.command.PlayerCommand;
 import fr.xephi.authme.data.limbo.LimboCache;
 import fr.xephi.authme.message.MessageKey;
 import fr.xephi.authme.service.CommonService;
diff --git a/src/main/java/fr/xephi/authme/datasource/Columns.java b/src/main/java/fr/xephi/authme/datasource/Columns.java
index b6d732cdb..f984007e3 100644
--- a/src/main/java/fr/xephi/authme/datasource/Columns.java
+++ b/src/main/java/fr/xephi/authme/datasource/Columns.java
@@ -6,6 +6,8 @@ import fr.xephi.authme.settings.properties.DatabaseSettings;
 /**
  * Database column names.
  */
+// Justification: String is immutable and this class is used to easily access the configurable column names
+@SuppressWarnings({"checkstyle:VisibilityModifier", "checkstyle:MemberName", "checkstyle:AbbreviationAsWordInName"})
 public final class Columns {
 
     public final String NAME;
diff --git a/src/main/java/fr/xephi/authme/datasource/converter/RakamakConverter.java b/src/main/java/fr/xephi/authme/datasource/converter/RakamakConverter.java
index eb9d904cd..42a8ecf1b 100644
--- a/src/main/java/fr/xephi/authme/datasource/converter/RakamakConverter.java
+++ b/src/main/java/fr/xephi/authme/datasource/converter/RakamakConverter.java
@@ -16,6 +16,7 @@ import java.io.File;
 import java.io.FileReader;
 import java.io.IOException;
 import java.util.HashMap;
+import java.util.Map;
 import java.util.Map.Entry;
 
 /**
@@ -40,19 +41,17 @@ public class RakamakConverter implements Converter {
     @Override
     // TODO ljacqu 20151229: Restructure this into smaller portions
     public void execute(CommandSender sender) {
-        boolean useIP = settings.getProperty(ConverterSettings.RAKAMAK_USE_IP);
+        boolean useIp = settings.getProperty(ConverterSettings.RAKAMAK_USE_IP);
         String fileName = settings.getProperty(ConverterSettings.RAKAMAK_FILE_NAME);
         String ipFileName = settings.getProperty(ConverterSettings.RAKAMAK_IP_FILE_NAME);
         File source = new File(pluginFolder, fileName);
-        File ipfiles = new File(pluginFolder, ipFileName);
-        HashMap<String, String> playerIP = new HashMap<>();
-        HashMap<String, HashedPassword> playerPSW = new HashMap<>();
+        File ipFiles = new File(pluginFolder, ipFileName);
+        Map<String, String> playerIP = new HashMap<>();
+        Map<String, HashedPassword> playerPassword = new HashMap<>();
         try {
-            BufferedReader users;
-            BufferedReader ipFile;
-            ipFile = new BufferedReader(new FileReader(ipfiles));
+            BufferedReader ipFile = new BufferedReader(new FileReader(ipFiles));
             String line;
-            if (useIP) {
+            if (useIp) {
                 String tempLine;
                 while ((tempLine = ipFile.readLine()) != null) {
                     if (tempLine.contains("=")) {
@@ -63,20 +62,20 @@ public class RakamakConverter implements Converter {
             }
             ipFile.close();
 
-            users = new BufferedReader(new FileReader(source));
+            BufferedReader users = new BufferedReader(new FileReader(source));
             while ((line = users.readLine()) != null) {
                 if (line.contains("=")) {
                     String[] arguments = line.split("=");
                     HashedPassword hashedPassword = passwordSecurity.computeHash(arguments[1], arguments[0]);
-                    playerPSW.put(arguments[0], hashedPassword);
+                    playerPassword.put(arguments[0], hashedPassword);
 
                 }
             }
             users.close();
-            for (Entry<String, HashedPassword> m : playerPSW.entrySet()) {
+            for (Entry<String, HashedPassword> m : playerPassword.entrySet()) {
                 String playerName = m.getKey();
-                HashedPassword psw = playerPSW.get(playerName);
-                String ip = useIP ? playerIP.get(playerName) : "127.0.0.1";
+                HashedPassword psw = playerPassword.get(playerName);
+                String ip = useIp ? playerIP.get(playerName) : "127.0.0.1";
                 PlayerAuth auth = PlayerAuth.builder()
                     .name(playerName)
                     .realName(playerName)
diff --git a/src/main/java/fr/xephi/authme/initialization/OnStartupTasks.java b/src/main/java/fr/xephi/authme/initialization/OnStartupTasks.java
index 349965083..8767e88a6 100644
--- a/src/main/java/fr/xephi/authme/initialization/OnStartupTasks.java
+++ b/src/main/java/fr/xephi/authme/initialization/OnStartupTasks.java
@@ -45,6 +45,12 @@ public class OnStartupTasks {
     OnStartupTasks() {
     }
 
+    /**
+     * Sends bstats metrics.
+     *
+     * @param plugin the plugin instance
+     * @param settings the settings
+     */
     public static void sendMetrics(AuthMe plugin, Settings settings) {
         final Metrics metrics = new Metrics(plugin);
 
diff --git a/src/main/java/fr/xephi/authme/listener/OnJoinVerifier.java b/src/main/java/fr/xephi/authme/listener/OnJoinVerifier.java
index e3ff4ec5b..06a8761ab 100644
--- a/src/main/java/fr/xephi/authme/listener/OnJoinVerifier.java
+++ b/src/main/java/fr/xephi/authme/listener/OnJoinVerifier.java
@@ -111,7 +111,7 @@ class OnJoinVerifier implements Reloadable {
      * @param event the login event to verify
      *
      * @return true if the player's connection should be refused (i.e. the event does not need to be processed
-     * further), false if the player is not refused
+     *         further), false if the player is not refused
      */
     public boolean refusePlayerForFullServer(PlayerLoginEvent event) {
         final Player player = event.getPlayer();
diff --git a/src/main/java/fr/xephi/authme/listener/protocollib/InventoryPacketAdapter.java b/src/main/java/fr/xephi/authme/listener/protocollib/InventoryPacketAdapter.java
index 48cf1868e..051507651 100644
--- a/src/main/java/fr/xephi/authme/listener/protocollib/InventoryPacketAdapter.java
+++ b/src/main/java/fr/xephi/authme/listener/protocollib/InventoryPacketAdapter.java
@@ -14,6 +14,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+
 package fr.xephi.authme.listener.protocollib;
 
 import com.comphenix.protocol.PacketType;
@@ -46,7 +47,7 @@ class InventoryPacketAdapter extends PacketAdapter {
     private static final int MAIN_SIZE = 27;
     private static final int HOTBAR_SIZE = 9;
 
-    public InventoryPacketAdapter(AuthMe plugin) {
+    InventoryPacketAdapter(AuthMe plugin) {
         super(plugin, PacketType.Play.Server.SET_SLOT, PacketType.Play.Server.WINDOW_ITEMS);
     }
 
diff --git a/src/main/java/fr/xephi/authme/listener/protocollib/TabCompletePacketAdapter.java b/src/main/java/fr/xephi/authme/listener/protocollib/TabCompletePacketAdapter.java
index 4476f80ad..daf686389 100644
--- a/src/main/java/fr/xephi/authme/listener/protocollib/TabCompletePacketAdapter.java
+++ b/src/main/java/fr/xephi/authme/listener/protocollib/TabCompletePacketAdapter.java
@@ -12,7 +12,7 @@ import fr.xephi.authme.data.auth.PlayerCache;
 
 class TabCompletePacketAdapter extends PacketAdapter {
 
-    public TabCompletePacketAdapter(AuthMe plugin) {
+    TabCompletePacketAdapter(AuthMe plugin) {
         super(plugin, ListenerPriority.NORMAL, PacketType.Play.Client.TAB_COMPLETE);
     }
 
diff --git a/src/main/java/fr/xephi/authme/permission/handlers/PermissionsBukkitHandler.java b/src/main/java/fr/xephi/authme/permission/handlers/PermissionsBukkitHandler.java
index b7773e7a2..acae466c1 100644
--- a/src/main/java/fr/xephi/authme/permission/handlers/PermissionsBukkitHandler.java
+++ b/src/main/java/fr/xephi/authme/permission/handlers/PermissionsBukkitHandler.java
@@ -31,7 +31,8 @@ public class PermissionsBukkitHandler implements PermissionHandler {
 
     @Override
     public boolean addToGroup(Player player, String group) {
-        return Bukkit.dispatchCommand(Bukkit.getConsoleSender(), "permissions player addgroup " + player.getName() + " " + group);
+        return Bukkit.dispatchCommand(Bukkit.getConsoleSender(),
+            "permissions player addgroup " + player.getName() + " " + group);
     }
 
     @Override
@@ -46,17 +47,19 @@ public class PermissionsBukkitHandler implements PermissionHandler {
 
     @Override
     public boolean removeFromGroup(Player player, String group) {
-        return Bukkit.dispatchCommand(Bukkit.getConsoleSender(), "permissions player removegroup " + player.getName() + " " + group);
+        return Bukkit.dispatchCommand(Bukkit.getConsoleSender(),
+            "permissions player removegroup " + player.getName() + " " + group);
     }
 
     @Override
     public boolean setGroup(Player player, String group) {
-        return Bukkit.dispatchCommand(Bukkit.getConsoleSender(), "permissions player setgroup " + player.getName() + " " + group);
+        return Bukkit.dispatchCommand(Bukkit.getConsoleSender(),
+            "permissions player setgroup " + player.getName() + " " + group);
     }
 
     @Override
     public List<String> getGroups(Player player) {
-        List<String> groups = new ArrayList<String>();
+        List<String> groups = new ArrayList<>();
         for (Group group : permissionsBukkitInstance.getGroups(player.getUniqueId())) {
             groups.add(group.getName());
         }
diff --git a/src/main/java/fr/xephi/authme/permission/handlers/ZPermissionsHandler.java b/src/main/java/fr/xephi/authme/permission/handlers/ZPermissionsHandler.java
index 1de19f1d7..c86863f78 100644
--- a/src/main/java/fr/xephi/authme/permission/handlers/ZPermissionsHandler.java
+++ b/src/main/java/fr/xephi/authme/permission/handlers/ZPermissionsHandler.java
@@ -30,7 +30,8 @@ public class ZPermissionsHandler implements PermissionHandler {
 
     @Override
     public boolean addToGroup(Player player, String group) {
-        return Bukkit.dispatchCommand(Bukkit.getConsoleSender(), "permissions player " + player.getName() + " addgroup " + group);
+        return Bukkit.dispatchCommand(Bukkit.getConsoleSender(),
+            "permissions player " + player.getName() + " addgroup " + group);
     }
 
     @Override
@@ -41,20 +42,23 @@ public class ZPermissionsHandler implements PermissionHandler {
     @Override
     public boolean hasPermissionOffline(String name, PermissionNode node) {
         Map<String, Boolean> perms = zPermissionsService.getPlayerPermissions(null, null, name);
-        if (perms.containsKey(node.getNode()))
+        if (perms.containsKey(node.getNode())) {
             return perms.get(node.getNode());
-        else
+        } else {
             return false;
+        }
     }
 
     @Override
     public boolean removeFromGroup(Player player, String group) {
-        return Bukkit.dispatchCommand(Bukkit.getConsoleSender(), "permissions player " + player.getName() + " removegroup " + group);
+        return Bukkit.dispatchCommand(Bukkit.getConsoleSender(),
+            "permissions player " + player.getName() + " removegroup " + group);
     }
 
     @Override
     public boolean setGroup(Player player, String group) {
-        return Bukkit.dispatchCommand(Bukkit.getConsoleSender(), "permissions player " + player.getName() + " setgroup " + group);
+        return Bukkit.dispatchCommand(Bukkit.getConsoleSender(),
+            "permissions player " + player.getName() + " setgroup " + group);
     }
 
     @Override
diff --git a/src/main/java/fr/xephi/authme/process/register/executors/PasswordRegisterExecutorProvider.java b/src/main/java/fr/xephi/authme/process/register/executors/PasswordRegisterExecutorProvider.java
index a79c63c82..9d40bcf82 100644
--- a/src/main/java/fr/xephi/authme/process/register/executors/PasswordRegisterExecutorProvider.java
+++ b/src/main/java/fr/xephi/authme/process/register/executors/PasswordRegisterExecutorProvider.java
@@ -56,10 +56,10 @@ class PasswordRegisterExecutorProvider {
     /** Registration executor for password registration. */
     class PasswordRegisterExecutor implements RegistrationExecutor {
 
-        protected final Player player;
+        private final Player player;
         private final String password;
         private final String email;
-        protected HashedPassword hashedPassword;
+        private HashedPassword hashedPassword;
 
         /**
          * Constructor.
@@ -105,6 +105,14 @@ class PasswordRegisterExecutorProvider {
             }
             syncProcessManager.processSyncPasswordRegister(player);
         }
+
+        protected Player getPlayer() {
+            return player;
+        }
+
+        protected HashedPassword getHashedPassword() {
+            return hashedPassword;
+        }
     }
 
     /** Executor for password registration via API call. */
@@ -147,8 +155,9 @@ class PasswordRegisterExecutorProvider {
         public void executePostPersistAction() {
             super.executePostPersistAction();
 
-            String qrCodeUrl = TwoFactor.getQRBarcodeURL(player.getName(), Bukkit.getIp(), hashedPassword.getHash());
-            commonService.send(player, MessageKey.TWO_FACTOR_CREATE, hashedPassword.getHash(), qrCodeUrl);
+            String hash = getHashedPassword().getHash();
+            String qrCodeUrl = TwoFactor.getQRBarcodeURL(getPlayer().getName(), Bukkit.getIp(), hash);
+            commonService.send(getPlayer(), MessageKey.TWO_FACTOR_CREATE, hash, qrCodeUrl);
         }
 
     }
diff --git a/src/main/java/fr/xephi/authme/security/crypts/SeparateSaltMethod.java b/src/main/java/fr/xephi/authme/security/crypts/SeparateSaltMethod.java
index 7d4b3d952..d0dacda4d 100644
--- a/src/main/java/fr/xephi/authme/security/crypts/SeparateSaltMethod.java
+++ b/src/main/java/fr/xephi/authme/security/crypts/SeparateSaltMethod.java
@@ -8,15 +8,15 @@ public abstract class SeparateSaltMethod implements EncryptionMethod {
     @Override
     public abstract String computeHash(String password, String salt, String name);
 
-    @Override
-    public abstract String generateSalt();
-
     @Override
     public HashedPassword computeHash(String password, String name) {
         String salt = generateSalt();
         return new HashedPassword(computeHash(password, salt, name), salt);
     }
 
+    @Override
+    public abstract String generateSalt();
+
     @Override
     public boolean comparePassword(String password, HashedPassword hashedPassword, String name) {
         return hashedPassword.getHash().equals(computeHash(password, hashedPassword.getSalt(), null));
diff --git a/src/main/java/fr/xephi/authme/security/crypts/UsernameSaltMethod.java b/src/main/java/fr/xephi/authme/security/crypts/UsernameSaltMethod.java
index 698979d8a..23101e22a 100644
--- a/src/main/java/fr/xephi/authme/security/crypts/UsernameSaltMethod.java
+++ b/src/main/java/fr/xephi/authme/security/crypts/UsernameSaltMethod.java
@@ -17,13 +17,13 @@ public abstract class UsernameSaltMethod implements EncryptionMethod {
     public abstract HashedPassword computeHash(String password, String name);
 
     @Override
-    public boolean comparePassword(String password, HashedPassword hashedPassword, String name) {
-        return hashedPassword.getHash().equals(computeHash(password, name).getHash());
+    public String computeHash(String password, String salt, String name) {
+        return computeHash(password, name).getHash();
     }
 
     @Override
-    public String computeHash(String password, String salt, String name) {
-        return computeHash(password, name).getHash();
+    public boolean comparePassword(String password, HashedPassword hashedPassword, String name) {
+        return hashedPassword.getHash().equals(computeHash(password, name).getHash());
     }
 
     @Override
diff --git a/src/main/java/fr/xephi/authme/service/BukkitService.java b/src/main/java/fr/xephi/authme/service/BukkitService.java
index 14cf0dcb7..e945cebd6 100644
--- a/src/main/java/fr/xephi/authme/service/BukkitService.java
+++ b/src/main/java/fr/xephi/authme/service/BukkitService.java
@@ -13,7 +13,6 @@ import org.bukkit.World;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Event;
-import org.bukkit.plugin.Plugin;
 import org.bukkit.scheduler.BukkitRunnable;
 import org.bukkit.scheduler.BukkitScheduler;
 import org.bukkit.scheduler.BukkitTask;
@@ -172,7 +171,7 @@ public class BukkitService implements SettingsDependent {
      * @return a BukkitTask that contains the id number
      * @throws IllegalArgumentException if plugin is null
      * @throws IllegalStateException if this was already scheduled
-     * @see BukkitScheduler#runTaskTimer(Plugin, Runnable, long, long)
+     * @see BukkitScheduler#runTaskTimer(org.bukkit.plugin.Plugin, Runnable, long, long)
      */
     public BukkitTask runTaskTimer(BukkitRunnable task, long delay, long period) {
         return task.runTaskTimer(authMe, delay, period);
diff --git a/src/main/java/fr/xephi/authme/settings/properties/BackupSettings.java b/src/main/java/fr/xephi/authme/settings/properties/BackupSettings.java
index 162bf8aac..57bb5941f 100644
--- a/src/main/java/fr/xephi/authme/settings/properties/BackupSettings.java
+++ b/src/main/java/fr/xephi/authme/settings/properties/BackupSettings.java
@@ -6,7 +6,7 @@ import ch.jalu.configme.properties.Property;
 
 import static ch.jalu.configme.properties.PropertyInitializer.newProperty;
 
-public class BackupSettings implements SettingsHolder {
+public final class BackupSettings implements SettingsHolder {
 
     @Comment("Enable or disable automatic backup")
     public static final Property<Boolean> ENABLED =
diff --git a/src/main/java/fr/xephi/authme/settings/properties/ConverterSettings.java b/src/main/java/fr/xephi/authme/settings/properties/ConverterSettings.java
index ae289e546..d2b34c9ac 100644
--- a/src/main/java/fr/xephi/authme/settings/properties/ConverterSettings.java
+++ b/src/main/java/fr/xephi/authme/settings/properties/ConverterSettings.java
@@ -6,7 +6,7 @@ import ch.jalu.configme.properties.Property;
 
 import static ch.jalu.configme.properties.PropertyInitializer.newProperty;
 
-public class ConverterSettings implements SettingsHolder {
+public final class ConverterSettings implements SettingsHolder {
 
     @Comment("Rakamak file name")
     public static final Property<String> RAKAMAK_FILE_NAME =
diff --git a/src/main/java/fr/xephi/authme/settings/properties/DatabaseSettings.java b/src/main/java/fr/xephi/authme/settings/properties/DatabaseSettings.java
index fde994af5..378bd1985 100644
--- a/src/main/java/fr/xephi/authme/settings/properties/DatabaseSettings.java
+++ b/src/main/java/fr/xephi/authme/settings/properties/DatabaseSettings.java
@@ -7,7 +7,7 @@ import fr.xephi.authme.datasource.DataSourceType;
 
 import static ch.jalu.configme.properties.PropertyInitializer.newProperty;
 
-public class DatabaseSettings implements SettingsHolder {
+public final class DatabaseSettings implements SettingsHolder {
 
     @Comment({"What type of database do you want to use?",
             "Valid values: sqlite, mysql"})
diff --git a/src/main/java/fr/xephi/authme/settings/properties/EmailSettings.java b/src/main/java/fr/xephi/authme/settings/properties/EmailSettings.java
index 3a9ede5d9..f7522b94f 100644
--- a/src/main/java/fr/xephi/authme/settings/properties/EmailSettings.java
+++ b/src/main/java/fr/xephi/authme/settings/properties/EmailSettings.java
@@ -9,7 +9,7 @@ import java.util.List;
 import static ch.jalu.configme.properties.PropertyInitializer.newListProperty;
 import static ch.jalu.configme.properties.PropertyInitializer.newProperty;
 
-public class EmailSettings implements SettingsHolder {
+public final class EmailSettings implements SettingsHolder {
 
     @Comment("Email SMTP server host")
     public static final Property<String> SMTP_HOST =
diff --git a/src/main/java/fr/xephi/authme/settings/properties/HooksSettings.java b/src/main/java/fr/xephi/authme/settings/properties/HooksSettings.java
index f512d67b7..d4e80a1c7 100644
--- a/src/main/java/fr/xephi/authme/settings/properties/HooksSettings.java
+++ b/src/main/java/fr/xephi/authme/settings/properties/HooksSettings.java
@@ -9,7 +9,7 @@ import java.util.List;
 import static ch.jalu.configme.properties.PropertyInitializer.newListProperty;
 import static ch.jalu.configme.properties.PropertyInitializer.newProperty;
 
-public class HooksSettings implements SettingsHolder {
+public final class HooksSettings implements SettingsHolder {
 
     @Comment("Do we need to hook with multiverse for spawn checking?")
     public static final Property<Boolean> MULTIVERSE =
diff --git a/src/main/java/fr/xephi/authme/settings/properties/PluginSettings.java b/src/main/java/fr/xephi/authme/settings/properties/PluginSettings.java
index 5f45ca5d9..d99ffa0b2 100644
--- a/src/main/java/fr/xephi/authme/settings/properties/PluginSettings.java
+++ b/src/main/java/fr/xephi/authme/settings/properties/PluginSettings.java
@@ -7,7 +7,7 @@ import fr.xephi.authme.output.LogLevel;
 
 import static ch.jalu.configme.properties.PropertyInitializer.newProperty;
 
-public class PluginSettings implements SettingsHolder {
+public final class PluginSettings implements SettingsHolder {
 
     @Comment({
         "Do you want to enable the session feature?",
diff --git a/src/main/java/fr/xephi/authme/settings/properties/ProtectionSettings.java b/src/main/java/fr/xephi/authme/settings/properties/ProtectionSettings.java
index 3a19a70e2..2bae7179c 100644
--- a/src/main/java/fr/xephi/authme/settings/properties/ProtectionSettings.java
+++ b/src/main/java/fr/xephi/authme/settings/properties/ProtectionSettings.java
@@ -10,7 +10,7 @@ import static ch.jalu.configme.properties.PropertyInitializer.newListProperty;
 import static ch.jalu.configme.properties.PropertyInitializer.newProperty;
 
 
-public class ProtectionSettings implements SettingsHolder {
+public final class ProtectionSettings implements SettingsHolder {
 
     @Comment("Enable some servers protection (country based login, antibot)")
     public static final Property<Boolean> ENABLE_PROTECTION =
diff --git a/src/main/java/fr/xephi/authme/settings/properties/PurgeSettings.java b/src/main/java/fr/xephi/authme/settings/properties/PurgeSettings.java
index 0cfa029ac..2c62454c8 100644
--- a/src/main/java/fr/xephi/authme/settings/properties/PurgeSettings.java
+++ b/src/main/java/fr/xephi/authme/settings/properties/PurgeSettings.java
@@ -6,7 +6,7 @@ import ch.jalu.configme.properties.Property;
 
 import static ch.jalu.configme.properties.PropertyInitializer.newProperty;
 
-public class PurgeSettings implements SettingsHolder {
+public final class PurgeSettings implements SettingsHolder {
 
     @Comment("If enabled, AuthMe automatically purges old, unused accounts")
     public static final Property<Boolean> USE_AUTO_PURGE =
diff --git a/src/main/java/fr/xephi/authme/settings/properties/RegistrationSettings.java b/src/main/java/fr/xephi/authme/settings/properties/RegistrationSettings.java
index 38615b789..7d87e77bd 100644
--- a/src/main/java/fr/xephi/authme/settings/properties/RegistrationSettings.java
+++ b/src/main/java/fr/xephi/authme/settings/properties/RegistrationSettings.java
@@ -8,7 +8,7 @@ import fr.xephi.authme.process.register.RegistrationType;
 
 import static ch.jalu.configme.properties.PropertyInitializer.newProperty;
 
-public class RegistrationSettings implements SettingsHolder {
+public final class RegistrationSettings implements SettingsHolder {
 
     @Comment("Enable registration on the server?")
     public static final Property<Boolean> IS_ENABLED =
@@ -42,7 +42,8 @@ public class RegistrationSettings implements SettingsHolder {
         "EMAIL_MANDATORY = for password register: 2nd argument MUST be an email address"
     })
     public static final Property<RegisterSecondaryArgument> REGISTER_SECOND_ARGUMENT =
-        newProperty(RegisterSecondaryArgument.class, "settings.registration.secondArg", RegisterSecondaryArgument.CONFIRMATION);
+        newProperty(RegisterSecondaryArgument.class, "settings.registration.secondArg",
+            RegisterSecondaryArgument.CONFIRMATION);
 
     @Comment({
         "Do we force kick a player after a successful registration?",
diff --git a/src/main/java/fr/xephi/authme/settings/properties/RestrictionSettings.java b/src/main/java/fr/xephi/authme/settings/properties/RestrictionSettings.java
index d0677579f..5a007b32d 100644
--- a/src/main/java/fr/xephi/authme/settings/properties/RestrictionSettings.java
+++ b/src/main/java/fr/xephi/authme/settings/properties/RestrictionSettings.java
@@ -10,7 +10,7 @@ import static ch.jalu.configme.properties.PropertyInitializer.newListProperty;
 import static ch.jalu.configme.properties.PropertyInitializer.newLowercaseListProperty;
 import static ch.jalu.configme.properties.PropertyInitializer.newProperty;
 
-public class RestrictionSettings implements SettingsHolder {
+public final class RestrictionSettings implements SettingsHolder {
 
     @Comment({
         "Can not authenticated players chat?",
diff --git a/src/main/java/fr/xephi/authme/settings/properties/SecuritySettings.java b/src/main/java/fr/xephi/authme/settings/properties/SecuritySettings.java
index 496fb3b2b..455af7e8b 100644
--- a/src/main/java/fr/xephi/authme/settings/properties/SecuritySettings.java
+++ b/src/main/java/fr/xephi/authme/settings/properties/SecuritySettings.java
@@ -12,7 +12,7 @@ import java.util.Set;
 import static ch.jalu.configme.properties.PropertyInitializer.newLowercaseListProperty;
 import static ch.jalu.configme.properties.PropertyInitializer.newProperty;
 
-public class SecuritySettings implements SettingsHolder {
+public final class SecuritySettings implements SettingsHolder {
 
     @Comment({"Stop the server if we can't contact the sql database",
         "Take care with this, if you set this to false,",
@@ -86,7 +86,8 @@ public class SecuritySettings implements SettingsHolder {
         "- 'password'",
         "- 'help'"})
     public static final Property<List<String>> UNSAFE_PASSWORDS =
-        newLowercaseListProperty("settings.security.unsafePasswords", "123456", "password", "qwerty", "12345", "54321", "123456789", "help");
+        newLowercaseListProperty("settings.security.unsafePasswords",
+            "123456", "password", "qwerty", "12345", "54321", "123456789", "help");
 
     @Comment("Tempban a user's IP address if they enter the wrong password too many times")
     public static final Property<Boolean> TEMPBAN_ON_MAX_LOGINS =
diff --git a/src/main/java/fr/xephi/authme/util/RandomStringUtils.java b/src/main/java/fr/xephi/authme/util/RandomStringUtils.java
index db166a748..2dce3c64a 100644
--- a/src/main/java/fr/xephi/authme/util/RandomStringUtils.java
+++ b/src/main/java/fr/xephi/authme/util/RandomStringUtils.java
@@ -24,7 +24,7 @@ public final class RandomStringUtils {
      * @return The random string
      */
     public static String generate(int length) {
-        return generate(length, LOWER_ALPHANUMERIC_INDEX);
+        return generateString(length, LOWER_ALPHANUMERIC_INDEX);
     }
 
     /**
@@ -35,7 +35,7 @@ public final class RandomStringUtils {
      * @return The random hexadecimal string
      */
     public static String generateHex(int length) {
-        return generate(length, HEX_MAX_INDEX);
+        return generateString(length, HEX_MAX_INDEX);
     }
 
     /**
@@ -46,10 +46,10 @@ public final class RandomStringUtils {
      * @return The random string
      */
     public static String generateLowerUpper(int length) {
-        return generate(length, CHARS.length);
+        return generateString(length, CHARS.length);
     }
 
-    private static String generate(int length, int maxIndex) {
+    private static String generateString(int length, int maxIndex) {
         if (length < 0) {
             throw new IllegalArgumentException("Length must be positive but was " + length);
         }
diff --git a/src/main/java/fr/xephi/authme/util/lazytags/TagReplacer.java b/src/main/java/fr/xephi/authme/util/lazytags/TagReplacer.java
index 660132fbc..a9d193199 100644
--- a/src/main/java/fr/xephi/authme/util/lazytags/TagReplacer.java
+++ b/src/main/java/fr/xephi/authme/util/lazytags/TagReplacer.java
@@ -11,7 +11,7 @@ import java.util.stream.Collectors;
  *
  * @param <A> the argument type
  */
-public class TagReplacer<A> {
+public final class TagReplacer<A> {
 
     private final List<Tag<A>> tags;
     private final Collection<String> messages;