--- a/net/minecraft/server/UserCache.java
+++ b/net/minecraft/server/UserCache.java
@@ -46,7 +46,7 @@
     private static boolean c;
     private final Map<String, UserCache.UserCacheEntry> d = Maps.newHashMap();
     private final Map<UUID, UserCache.UserCacheEntry> e = Maps.newHashMap();
-    private final Deque<GameProfile> f = Lists.newLinkedList();
+    private final Deque<GameProfile> f = new java.util.concurrent.LinkedBlockingDeque<GameProfile>(); // CraftBukkit
     private final GameProfileRepository g;
     protected final Gson b;
     private final File h;
@@ -330,11 +330,11 @@
             }
         }
 
-        public JsonElement serialize(Object object, Type type, JsonSerializationContext jsonserializationcontext) {
+        public JsonElement serialize(UserCacheEntry object, Type type, JsonSerializationContext jsonserializationcontext) { // CraftBukkit - decompile error
             return this.a((UserCache.UserCacheEntry) object, type, jsonserializationcontext);
         }
 
-        public Object deserialize(JsonElement jsonelement, Type type, JsonDeserializationContext jsondeserializationcontext) throws JsonParseException {
+        public UserCacheEntry deserialize(JsonElement jsonelement, Type type, JsonDeserializationContext jsondeserializationcontext) throws JsonParseException { // CraftBukkit - decompile error
             return this.a(jsonelement, type, jsondeserializationcontext);
         }