Migrate SLF4J logging (Fixes #177)

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

@@ -3,6 +3,7 @@ package com.github.games647.fastlogin.bungee;
 import com.github.games647.fastlogin.bungee.hooks.BungeeAuthHook;
 import com.github.games647.fastlogin.bungee.listener.ConnectListener;
 import com.github.games647.fastlogin.bungee.listener.MessageListener;
+import com.github.games647.fastlogin.core.CommonUtil;
 import com.github.games647.fastlogin.core.mojang.MojangApiConnector;
 import com.github.games647.fastlogin.core.shared.FastLoginCore;
 import com.github.games647.fastlogin.core.shared.PlatformPlugin;
@@ -20,12 +21,15 @@ import net.md_5.bungee.api.connection.ProxiedPlayer;
 import net.md_5.bungee.api.plugin.Plugin;
 import net.md_5.bungee.api.scheduler.GroupedThreadFactory;
 
+import org.slf4j.Logger;
+
 /**
  * BungeeCord version of FastLogin. This plugin keeps track on online mode connections.
  */
 public class FastLoginBungee extends Plugin implements PlatformPlugin<CommandSender> {
 
     private final ConcurrentMap<PendingConnection, BungeeLoginSession> session = Maps.newConcurrentMap();
+    private final Logger logger = CommonUtil.createLoggerFromJDK(getLogger());
 
     private FastLoginCore<ProxiedPlayer, CommandSender, FastLoginBungee> core;
 
@@ -66,7 +70,7 @@ public class FastLoginBungee extends Plugin implements PlatformPlugin<CommandSen
         Plugin plugin = getProxy().getPluginManager().getPlugin("BungeeAuth");
         if (plugin != null) {
             core.setAuthPluginHook(new BungeeAuthHook());
-            getLogger().info("Hooked into BungeeAuth");
+            logger.info("Hooked into BungeeAuth");
         }
     }
 
@@ -75,6 +79,11 @@ public class FastLoginBungee extends Plugin implements PlatformPlugin<CommandSen
         return getDescription().getName();
     }
 
+    @Override
+    public Logger getLog() {
+        return logger;
+    }
+
     @Override
     public void sendMessage(CommandSender receiver, String message) {
         receiver.sendMessage(TextComponent.fromLegacyText(message));
@@ -88,6 +97,6 @@ public class FastLoginBungee extends Plugin implements PlatformPlugin<CommandSen
 
     @Override
     public MojangApiConnector makeApiConnector(List<String> addresses, int requests, List<HostAndPort> proxies) {
-        return new MojangApiConnector(getLogger(), addresses, requests, proxies);
+        return new MojangApiConnector(getLog(), addresses, requests, proxies);
     }
 }

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

@@ -9,7 +9,6 @@ import com.google.common.base.Charsets;
 
 import java.lang.reflect.Field;
 import java.util.UUID;
-import java.util.logging.Level;
 
 import net.md_5.bungee.api.ProxyServer;
 import net.md_5.bungee.api.connection.PendingConnection;
@@ -82,7 +81,7 @@ public class ConnectListener implements Listener {
                     idField.setAccessible(true);
                     idField.set(connection, offlineUUID);
                 } catch (NoSuchFieldException | IllegalAccessException ex) {
-                    plugin.getLogger().log(Level.SEVERE, "Failed to set offline uuid", ex);
+                    plugin.getLog().error("Failed to set offline uuid", ex);
                 }
             }