Try to upgrade to Java 8. I hope enough people are using it.

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

@@ -120,9 +120,9 @@ public class FastLoginBukkit extends JavaPlugin {
         }
 
         //remove old blacklists
-        for (Player player : getServer().getOnlinePlayers()) {
+        getServer().getOnlinePlayers().forEach(player -> {
             player.removeMetadata(getName(), this);
-        }
+        });
     }
 
     public BukkitCore getCore() {

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

@@ -42,11 +42,8 @@ public class CrackedCommand implements CommandExecutor {
                     sender.sendMessage(plugin.getCore().getMessage("remove-premium"));
                     profile.setPremium(false);
                     profile.setUuid(null);
-                    Bukkit.getScheduler().runTaskAsynchronously(plugin, new Runnable() {
+                    Bukkit.getScheduler().runTaskAsynchronously(plugin, () -> {
-                        @Override
-                        public void run() {
                         plugin.getCore().getStorage().save(profile);
-                        }
                     });
                 } else {
                     sender.sendMessage(plugin.getCore().getMessage("not-premium"));
@@ -87,11 +84,8 @@ public class CrackedCommand implements CommandExecutor {
             } else {
                 sender.sendMessage(plugin.getCore().getMessage("remove-premium"));
                 profile.setPremium(false);
-                Bukkit.getScheduler().runTaskAsynchronously(plugin, new Runnable() {
+                Bukkit.getScheduler().runTaskAsynchronously(plugin, () -> {
-                    @Override
-                    public void run() {
                     plugin.getCore().getStorage().save(profile);
-                    }
                 });
             }
         }

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

@@ -59,11 +59,8 @@ public class PremiumCommand implements CommandExecutor {
                 } else {
                     //todo: resolve uuid
                     profile.setPremium(true);
-                    Bukkit.getScheduler().runTaskAsynchronously(plugin, new Runnable() {
+                    Bukkit.getScheduler().runTaskAsynchronously(plugin, () -> {
-                        @Override
-                        public void run() {
                         plugin.getCore().getStorage().save(profile);
-                        }
                     });
 
                     sender.sendMessage(plugin.getCore().getMessage("add-premium"));
@@ -103,11 +100,8 @@ public class PremiumCommand implements CommandExecutor {
             } else {
                 //todo: resolve uuid
                 profile.setPremium(true);
-                Bukkit.getScheduler().runTaskAsynchronously(plugin, new Runnable() {
+                Bukkit.getScheduler().runTaskAsynchronously(plugin, () -> {
-                    @Override
-                    public void run() {
                     plugin.getCore().getStorage().save(profile);
-                    }
                 });
 
                 sender.sendMessage(plugin.getCore().getMessage("add-premium-other"));

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/hooks/CrazyLoginHook.java

@@ -8,7 +8,6 @@ import de.st_ddt.crazylogin.databases.CrazyLoginDataDatabase;
 import de.st_ddt.crazylogin.listener.PlayerListener;
 import de.st_ddt.crazylogin.metadata.Authenticated;
 
-import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Future;
 import java.util.logging.Level;
@@ -32,10 +31,7 @@ public class CrazyLoginHook implements AuthPlugin<Player> {
     @Override
     public boolean forceLogin(final Player player) {
         //not thread-safe operation
-        Future<LoginPlayerData> future = Bukkit.getScheduler().callSyncMethod(crazyLoginPlugin
+        Future<LoginPlayerData> future = Bukkit.getScheduler().callSyncMethod(crazyLoginPlugin, () -> {
-                , new Callable<LoginPlayerData>() {
-            @Override
-            public LoginPlayerData call() throws Exception {
             LoginPlayerData playerData = crazyLoginPlugin.getPlayerData(player.getName());
             if (playerData != null) {
                 //mark the account as logged in
@@ -64,7 +60,6 @@ public class CrazyLoginHook implements AuthPlugin<Player> {
             }
 
             return null;
-            }
         });
 
         try {
@@ -110,7 +105,7 @@ public class CrazyLoginHook implements AuthPlugin<Player> {
         PlayerListener listener;
         try {
             listener = (PlayerListener) FieldUtils.readField(crazyLoginPlugin, "playerListener", true);
-        } catch (Exception ex) {
+        } catch (IllegalAccessException ex) {
             crazyLoginPlugin.getLogger().log(Level.SEVERE, "Failed to get the listener instance for auto login", ex);
             listener = null;
         }

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/hooks/RoyalAuthHook.java

@@ -2,7 +2,6 @@ package com.github.games647.fastlogin.bukkit.hooks;
 
 import com.github.games647.fastlogin.core.hooks.AuthPlugin;
 
-import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Future;
 import java.util.logging.Level;
@@ -27,9 +26,7 @@ public class RoyalAuthHook implements AuthPlugin<Player> {
     @Override
     public boolean forceLogin(final Player player) {
         //not thread-safe
-        Future<Boolean> future = Bukkit.getScheduler().callSyncMethod(royalAuthPlugin, new Callable<Boolean>() {
+        Future<Boolean> future = Bukkit.getScheduler().callSyncMethod(royalAuthPlugin, () -> {
-            @Override
-            public Boolean call() throws Exception {
             AuthPlayer authPlayer = AuthPlayer.getAuthPlayer(player);
 
 //https://github.com/RoyalDev/RoyalAuth/blob/master/src/main/java/org/royaldev/royalauth/commands/CmdLogin.java#L62
@@ -37,7 +34,6 @@ public class RoyalAuthHook implements AuthPlugin<Player> {
             authPlayer.login();
 
             return authPlayer.isLoggedIn();
-            }
         });
 
         try {

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/hooks/UltraAuthHook.java

@@ -2,7 +2,6 @@ package com.github.games647.fastlogin.bukkit.hooks;
 
 import com.github.games647.fastlogin.core.hooks.AuthPlugin;
 
-import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Future;
 import java.util.logging.Level;
@@ -28,12 +27,9 @@ public class UltraAuthHook implements AuthPlugin<Player> {
     @Override
     public boolean forceLogin(final Player player) {
         //not thread-safe
-        Future<Boolean> future = Bukkit.getScheduler().callSyncMethod(ultraAuthPlugin, new Callable<Boolean>() {
+        Future<Boolean> future = Bukkit.getScheduler().callSyncMethod(ultraAuthPlugin, () -> {
-            @Override
-            public Boolean call() throws Exception {
             UltraAuthAPI.authenticatedPlayer(player);
             return UltraAuthAPI.isAuthenticated(player);
-            }
         });
 
         try {

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/hooks/xAuthHook.java

@@ -5,7 +5,6 @@ import com.github.games647.fastlogin.core.hooks.AuthPlugin;
 import de.luricos.bukkit.xAuth.xAuth;
 import de.luricos.bukkit.xAuth.xAuthPlayer;
 
-import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Future;
 import java.util.logging.Level;
@@ -28,9 +27,7 @@ public class xAuthHook implements AuthPlugin<Player> {
     @Override
     public boolean forceLogin(final Player player) {
         //not thread-safe
-        Future<Boolean> future = Bukkit.getScheduler().callSyncMethod(xAuthPlugin, new Callable<Boolean>() {
+        Future<Boolean> future = Bukkit.getScheduler().callSyncMethod(xAuthPlugin, () -> {
-            @Override
-            public Boolean call() throws Exception {
             xAuthPlayer xAuthPlayer = xAuthPlugin.getPlayerManager().getPlayer(player);
             if (xAuthPlayer != null) {
                 //we checked that the player is premium (paid account)
@@ -41,7 +38,6 @@ public class xAuthHook implements AuthPlugin<Player> {
             }
 
             return false;
-            }
         });
 
         try {
@@ -62,9 +58,7 @@ public class xAuthHook implements AuthPlugin<Player> {
     @Override
     public boolean forceRegister(final Player player, final String password) {
         //not thread-safe
-        Future<Boolean> future = Bukkit.getScheduler().callSyncMethod(xAuthPlugin, new Callable<Boolean>() {
+        Future<Boolean> future = Bukkit.getScheduler().callSyncMethod(xAuthPlugin, () -> {
-            @Override
-            public Boolean call() throws Exception {
             xAuthPlayer xAuthPlayer = xAuthPlugin.getPlayerManager().getPlayer(player);
             if (xAuthPlayer != null) {
                 //this should run async because the plugin executes a sql query, but the method
@@ -76,7 +70,6 @@ public class xAuthHook implements AuthPlugin<Player> {
             }
 
             return false;
-            }
         });
 
         try {

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

@@ -21,7 +21,7 @@ public class BukkitJoinListener implements Listener {
 
     private static final long DELAY_LOGIN = 20L / 2;
 
-    protected final FastLoginBukkit plugin;
+    private final FastLoginBukkit plugin;
 
     public BukkitJoinListener(FastLoginBukkit plugin) {
         this.plugin = plugin;

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

@@ -52,10 +52,10 @@ public class BungeeCordListener implements PluginMessageListener {
         plugin.getLogger().log(Level.FINEST, "Received plugin message for subchannel {0} from {1}"
                 , new Object[]{subchannel, player});
 
-        final String playerName = dataInput.readUTF();
+        String playerName = dataInput.readUTF();
 
         //check if the player is still online or disconnected
-        final Player checkedPlayer = plugin.getServer().getPlayerExact(playerName);
+        Player checkedPlayer = plugin.getServer().getPlayerExact(playerName);
         //fail if target player is blacklisted because already authed or wrong bungeecord id
         if (checkedPlayer != null && !checkedPlayer.hasMetadata(plugin.getName())) {
             //blacklist this target player for BungeeCord Id brute force attacks
@@ -77,9 +77,7 @@ public class BungeeCordListener implements PluginMessageListener {
                     plugin.getSessions().put(id, playerSession);
                     Bukkit.getScheduler().runTaskAsynchronously(plugin, new ForceLoginTask(plugin, player));
                 } else if ("AUTO_REGISTER".equalsIgnoreCase(subchannel)) {
-                    Bukkit.getScheduler().runTaskAsynchronously(plugin, new Runnable() {
+                    Bukkit.getScheduler().runTaskAsynchronously(plugin, () -> {
-                        @Override
-                        public void run() {
                         AuthPlugin<Player> authPlugin = plugin.getCore().getAuthPluginHook();
                         try {
                             //we need to check if the player is registered on Bukkit too
@@ -92,7 +90,6 @@ public class BungeeCordListener implements PluginMessageListener {
                         } catch (Exception ex) {
                             plugin.getLogger().log(Level.SEVERE, "Failed to query isRegistered", ex);
                         }
-                        }
                     });
                 }
             }

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

@@ -28,7 +28,7 @@ public class ProtocolLibLoginSource implements LoginSource {
     private final Random random;
 
     private String serverId;
-    private byte[] verifyToken = new byte[VERIFY_TOKEN_LENGTH];
+    private final byte[] verifyToken = new byte[VERIFY_TOKEN_LENGTH];
 
     public ProtocolLibLoginSource(FastLoginBukkit plugin, PacketEvent packetEvent, Player player, Random random) {
         this.plugin = plugin;

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

@@ -9,8 +9,8 @@ import com.github.games647.fastlogin.bukkit.hooks.UltraAuthHook;
 import com.github.games647.fastlogin.bukkit.hooks.xAuthHook;
 import com.github.games647.fastlogin.core.hooks.AuthPlugin;
 import com.google.common.collect.Lists;
+import java.util.List;
 
-import java.util.ArrayList;
 import java.util.logging.Level;
 
 import org.bukkit.Bukkit;
@@ -40,7 +40,7 @@ public class DelayedAuthHook implements Runnable {
     private boolean registerHooks() {
         AuthPlugin<Player> authPluginHook = null;
         try {
-            ArrayList<Class<? extends AuthPlugin<Player>>> supportedHooks = Lists.newArrayList(AuthMeHook.class
+            List<Class<? extends AuthPlugin<Player>>> supportedHooks = Lists.newArrayList(AuthMeHook.class
                     , CrazyLoginHook.class, LogItHook.class, LoginSecurityHook.class, UltraAuthHook.class
                     , xAuthHook.class);
             for (Class<? extends AuthPlugin<Player>> clazz : supportedHooks) {

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/tasks/ForceLoginTask.java

@@ -122,12 +122,7 @@ public class ForceLoginTask implements Runnable {
 
     private boolean isOnlineThreadSafe() {
         //the playerlist isn't thread-safe
-        Future<Boolean> onlineFuture = Bukkit.getScheduler().callSyncMethod(plugin, new Callable<Boolean>() {
+        Future<Boolean> onlineFuture = Bukkit.getScheduler().callSyncMethod(plugin, player::isOnline);
-            @Override
-            public Boolean call() throws Exception {
-                return player.isOnline();
-            }
-        });
 
         try {
             return onlineFuture.get();

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

@@ -26,9 +26,9 @@ public class BungeeCore extends FastLoginCore<ProxiedPlayer> {
     private static Map<String, Object> generateConfigMap(Configuration config) {
         Map<String, Object> configMap = Maps.newHashMap();
         Collection<String> keys = config.getKeys();
-        for (String key : keys) {
+        keys.forEach(key -> {
             configMap.put(key, config.get(key));
-        }
+        });
 
         return configMap;
     }
@@ -72,12 +72,12 @@ public class BungeeCore extends FastLoginCore<ProxiedPlayer> {
             File messageFile = new File(getDataFolder(), "messages.yml");
             Configuration messageConfig = ConfigurationProvider.getProvider(YamlConfiguration.class)
                     .load(messageFile, defaults);
-            for (String key : messageConfig.getKeys()) {
+            messageConfig.getKeys().forEach((key) -> {
                 String message = ChatColor.translateAlternateColorCodes('&', messageConfig.getString(key));
                 if (!message.isEmpty()) {
                     localeMessages.put(key, message);
                 }
-            }
+            });
         } catch (IOException ex) {
             getLogger().log(Level.SEVERE, "Failed to load messages", ex);
         }

bungee/src/main/java/com/github/games647/fastlogin/bungee/hooks/BungeeAuthPlugin.java

@@ -9,9 +9,12 @@ import net.md_5.bungee.api.connection.ProxiedPlayer;
 @Deprecated
 public interface BungeeAuthPlugin extends AuthPlugin<ProxiedPlayer> {
 
+    @Override
     boolean forceLogin(ProxiedPlayer player);
 
+    @Override
     boolean isRegistered(String playerName) throws Exception;
 
+    @Override
     boolean forceRegister(ProxiedPlayer player, String password);
 }

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

@@ -45,7 +45,10 @@ public class PlayerConnectionListener implements Listener {
         }
 
         preLoginEvent.registerIntent(plugin);
-        ProxyServer.getInstance().getScheduler().runAsync(plugin, new AsyncPremiumCheck(plugin, preLoginEvent));
+        
+        PendingConnection connection = preLoginEvent.getConnection();
+        AsyncPremiumCheck asyncPremiumCheck = new AsyncPremiumCheck(plugin, preLoginEvent, connection);
+        ProxyServer.getInstance().getScheduler().runAsync(plugin, asyncPremiumCheck);
     }
 
     @EventHandler(priority = EventPriority.LOW)

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

@@ -44,12 +44,10 @@ public class PluginMessageListener implements Listener {
 
     private void readMessage(PluginMessageEvent pluginMessageEvent) {
         //so that we can safely process this in the background
-        final byte[] data = Arrays.copyOf(pluginMessageEvent.getData(), pluginMessageEvent.getData().length);
+        byte[] data = Arrays.copyOf(pluginMessageEvent.getData(), pluginMessageEvent.getData().length);
-        final ProxiedPlayer forPlayer = (ProxiedPlayer) pluginMessageEvent.getReceiver();
+        ProxiedPlayer forPlayer = (ProxiedPlayer) pluginMessageEvent.getReceiver();
 
-        ProxyServer.getInstance().getScheduler().runAsync(plugin, new Runnable() {
+        ProxyServer.getInstance().getScheduler().runAsync(plugin, () -> {
-            @Override
-            public void run() {
             ByteArrayDataInput dataInput = ByteStreams.newDataInput(data);
             String subchannel = dataInput.readUTF();
             if ("ON".equals(subchannel)) {
@@ -86,7 +84,6 @@ public class PluginMessageListener implements Listener {
                     }
                 }
             }
-            }
         });
     }
 }

bungee/src/main/java/com/github/games647/fastlogin/bungee/tasks/AsyncPremiumCheck.java

@@ -8,23 +8,25 @@ import com.github.games647.fastlogin.core.shared.JoinManagement;
 
 import net.md_5.bungee.api.connection.PendingConnection;
 import net.md_5.bungee.api.connection.ProxiedPlayer;
-import net.md_5.bungee.api.event.PreLoginEvent;
+import net.md_5.bungee.api.event.AsyncEvent;
 
 public class AsyncPremiumCheck extends JoinManagement<ProxiedPlayer, BungeeLoginSource> implements Runnable {
 
     private final FastLoginBungee plugin;
-    private final PreLoginEvent preLoginEvent;
+    private final AsyncEvent<?> preLoginEvent;
 
-    public AsyncPremiumCheck(FastLoginBungee plugin, PreLoginEvent preLoginEvent) {
+    private final PendingConnection connection;
+
+    public AsyncPremiumCheck(FastLoginBungee plugin, AsyncEvent<?> preLoginEvent, PendingConnection connection) {
         super(plugin.getCore(), plugin.getCore().getAuthPluginHook());
 
         this.plugin = plugin;
         this.preLoginEvent = preLoginEvent;
+        this.connection = connection;
     }
 
     @Override
     public void run() {
-        PendingConnection connection = preLoginEvent.getConnection();
         plugin.getSession().remove(connection);
 
         String username = connection.getName();

bungee/src/main/java/com/github/games647/fastlogin/bungee/tasks/ForceLoginTask.java

@@ -9,8 +9,8 @@ import com.google.common.io.ByteStreams;
 
 import java.util.UUID;
 import java.util.logging.Level;
-import net.md_5.bungee.api.chat.TextComponent;
 
+import net.md_5.bungee.api.chat.TextComponent;
 import net.md_5.bungee.api.connection.PendingConnection;
 import net.md_5.bungee.api.connection.ProxiedPlayer;
 import net.md_5.bungee.api.connection.Server;

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

@@ -18,13 +18,13 @@ public class AuthStorage {
 
     private static final String PREMIUM_TABLE = "premium";
 
-    private final FastLoginCore core;
+    private final FastLoginCore<?> core;
     private final HikariDataSource dataSource;
 
     //a try to fix https://www.spigotmc.org/threads/fastlogin.101192/page-26#post-1874647
     private final Calendar calendar = Calendar.getInstance(Locale.US);
 
-    public AuthStorage(FastLoginCore core, String driver, String host, int port, String databasePath
+    public AuthStorage(FastLoginCore<?> core, String driver, String host, int port, String databasePath
             , String user, String pass) {
         this.core = core;
 

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

@@ -7,6 +7,7 @@ import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
+import java.util.concurrent.atomic.AtomicInteger;
 
 import javax.net.ssl.SSLSocketFactory;
 
@@ -17,9 +18,7 @@ public class BalancedSSLFactory extends SSLSocketFactory {
     //in order to be thread-safe
     private final List<InetAddress> localAddresses;
 
-    private final Object lock = new Object();
+    private AtomicInteger id;
-
-    private int id;
 
     public BalancedSSLFactory(SSLSocketFactory oldFactory, Set<InetAddress> localAddresses) {
         this.oldFactory = oldFactory;
@@ -65,16 +64,7 @@ public class BalancedSSLFactory extends SSLSocketFactory {
     }
 
     private InetAddress getNextLocalAddress() {
-        int next;
+        int index = id.incrementAndGet() % localAddresses.size();
-        synchronized (lock) {
-            next = id;
-            id++;
-            if (next == Integer.MAX_VALUE) {
-                id = 0;
-            }
-        }
-
-        int index = next % localAddresses.size();
         return localAddresses.get(index);
     }
 }

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

@@ -26,10 +26,10 @@ public class CompatibleCacheBuilder<K, V> {
      * @return A new cache builder.
      */
     public static <K, V> CompatibleCacheBuilder<K, V> newBuilder() {
-        return new CompatibleCacheBuilder<K, V>();
+        return new CompatibleCacheBuilder<>();
     }
 
-    private CacheBuilder<K, V> builder;
+    private final CacheBuilder<K, V> builder;
     
     @SuppressWarnings("unchecked")
     private CompatibleCacheBuilder() {

core/src/main/java/com/github/games647/fastlogin/core/hooks/DefaultPasswordGenerator.java

@@ -4,9 +4,9 @@ import java.util.Random;
 
 public class DefaultPasswordGenerator<T> implements PasswordGenerator<T> {
 
-    private final Random random = new Random();
     private static final char[] PASSWORD_CHARACTERS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
             .toCharArray();
+    private final Random random = new Random();
 
     @Override
     public String getRandomPassword(T player) {

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

@@ -8,10 +8,10 @@ import java.util.logging.Level;
 
 public abstract class JoinManagement<T, S extends LoginSource> {
 
-    protected final FastLoginCore core;
+    protected final FastLoginCore<T> core;
     protected final AuthPlugin<T> authHook;
 
-    public JoinManagement(FastLoginCore core, AuthPlugin<T> authHook) {
+    public JoinManagement(FastLoginCore<T> core, AuthPlugin<T> authHook) {
         this.core = core;
         this.authHook = authHook;
     }
@@ -62,8 +62,7 @@ public abstract class JoinManagement<T, S extends LoginSource> {
         }
     }
 
-    private boolean checkPremiumName(String username, S source, PlayerProfile profile)
+    private boolean checkPremiumName(String username, S source, PlayerProfile profile) throws Exception {
-            throws Exception {
         if (core.getSharedConfig().get("autoRegister", false)
                 && (authHook == null || !authHook.isRegistered(username))) {
             core.getLogger().log(Level.FINER, "Player {0} uses a premium username", username);

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

@@ -1,6 +1,8 @@
 package com.github.games647.fastlogin.core.shared;
 
 import com.github.games647.fastlogin.core.BalancedSSLFactory;
+import com.google.common.collect.Sets;
+
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
@@ -8,7 +10,6 @@ import java.net.HttpURLConnection;
 import java.net.InetAddress;
 import java.net.URL;
 import java.net.UnknownHostException;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 import java.util.UUID;
@@ -56,7 +57,7 @@ public abstract class MojangApiConnector {
         if (localAddresses.isEmpty()) {
             this.sslFactory = null;
         } else {
-            Set<InetAddress> addresses = new HashSet<>();
+            Set<InetAddress> addresses = Sets.newHashSet();
             for (String localAddress : localAddresses) {
                 try {
                     InetAddress address = InetAddress.getByName(localAddress);

pom.xml

@@ -50,8 +50,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.5.1</version>
                 <configuration>
-                    <source>1.7</source>
+                    <source>1.8</source>
-                    <target>1.7</target>
+                    <target>1.8</target>
                     <showWarnings>true</showWarnings>
                     <showDeprecation>true</showDeprecation>
                 </configuration>