diff --git a/net/src/main/java/com/zfoo/net/util/SimpleCache.java b/net/src/main/java/com/zfoo/net/util/SimpleCache.java
index 923cd1aa..f50912ca 100644
--- a/net/src/main/java/com/zfoo/net/util/SimpleCache.java
+++ b/net/src/main/java/com/zfoo/net/util/SimpleCache.java
@@ -29,7 +29,7 @@ import java.util.concurrent.TimeUnit;
 import java.util.function.Function;
 
 /**
- * guava的缓存都是单个存，单个更新，但是实际的项目很多都是批量查询，批量更新。
+ * caffeine的缓存都是单个存，单个更新，但是实际的项目很多都是批量查询，批量更新。
  * <p>
  * 优势：
  * 1.支持批量查找，批量更新。
@@ -48,7 +48,7 @@ public class SimpleCache<K, V> {
     private static final int BATCH_RELOAD_SIZE = 1000;
 
     private LoadingCache<K, V> cache;
-    private ConcurrentLinkedQueue linkedQueue;
+    private ConcurrentLinkedQueue<K> linkedQueue;
 
     private long expiredAccessDuration;
     private long refreshDuration;
diff --git a/net/src/main/java/com/zfoo/net/util/SingleCache.java b/net/src/main/java/com/zfoo/net/util/SingleCache.java
index 95ae4fde..ed550a20 100644
--- a/net/src/main/java/com/zfoo/net/util/SingleCache.java
+++ b/net/src/main/java/com/zfoo/net/util/SingleCache.java
@@ -35,7 +35,7 @@ public class SingleCache<V> {
 
     private volatile V cache;
     private volatile long refreshTime;
-    private Lock lock = new ReentrantLock();
+    private final Lock lock = new ReentrantLock();
 
 
     /**