Make use of the awesome Java 8 features

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

@@ -42,12 +42,9 @@ public abstract class FastLoginCore<P> {
             builder.maximumSize(maxSize);
         }
 
-        return builder.build(new CacheLoader<K, V>() {
-            @Override
-            public V load(K key) throws Exception {
-                throw new UnsupportedOperationException("Not supported yet.");
-            }
-        });
+        return builder.build(CacheLoader.from(() -> {
+            throw new UnsupportedOperationException();
+        }));
     }
 
     public static UUID parseId(String withoutDashes) {

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

@@ -62,7 +62,7 @@ public abstract class MojangApiConnector {
                 try {
                     InetAddress address = InetAddress.getByName(localAddress);
                     if (!address.isAnyLocalAddress()) {
-                        logger.log(Level.WARNING, "Submitted IP-Address is not local", address);
+                        logger.log(Level.WARNING, "Submitted IP-Address is not local {0}", address);
                         continue;
                     }