diff --git a/blade-core-tool/src/main/java/org/springblade/core/tool/utils/ProtostuffUtil.java b/blade-core-tool/src/main/java/org/springblade/core/tool/utils/ProtostuffUtil.java
index bd36b06..841c190 100644
--- a/blade-core-tool/src/main/java/org/springblade/core/tool/utils/ProtostuffUtil.java
+++ b/blade-core-tool/src/main/java/org/springblade/core/tool/utils/ProtostuffUtil.java
@@ -34,11 +34,11 @@ public class ProtostuffUtil {
 	/**
 	 * 避免每次序列化都重新申请Buffer空间
 	 */
-	private static LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
+	private static final LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
 	/**
 	 * 缓存Schema
 	 */
-	private static Map<Class<?>, Schema<?>> schemaCache = new ConcurrentHashMap<>();
+	private static final Map<Class<?>, Schema<?>> schemaCache = new ConcurrentHashMap<>();
 
 	/**
 	 * 序列化方法，把指定对象序列化成字节数组