diff --git a/client/src/main/java/com/alibaba/nacos/client/naming/utils/CollectionUtils.java b/client/src/main/java/com/alibaba/nacos/client/naming/utils/CollectionUtils.java
index a115505dc..65f9e3227 100644
--- a/client/src/main/java/com/alibaba/nacos/client/naming/utils/CollectionUtils.java
+++ b/client/src/main/java/com/alibaba/nacos/client/naming/utils/CollectionUtils.java
@@ -46,7 +46,7 @@ public class CollectionUtils {
     /**
      * Constant to avoid repeated object creation
      */
-    private static Integer INTEGER_ONE = 1;
+    private static final Integer INTEGER_ONE = 1;
 
     /**
      * <code>CollectionUtils</code> should not normally be instantiated.
diff --git a/client/src/main/java/com/alibaba/nacos/client/naming/utils/IoUtils.java b/client/src/main/java/com/alibaba/nacos/client/naming/utils/IoUtils.java
index e6795a6fa..b4a5afdde 100644
--- a/client/src/main/java/com/alibaba/nacos/client/naming/utils/IoUtils.java
+++ b/client/src/main/java/com/alibaba/nacos/client/naming/utils/IoUtils.java
@@ -25,6 +25,7 @@ import java.util.List;
 import java.util.zip.GZIPInputStream;
 
 import static com.alibaba.nacos.client.utils.LogUtils.NAMING_LOGGER;
+import static org.apache.commons.lang3.CharEncoding.UTF_8;
 
 /**
  * @author nkorange
@@ -34,7 +35,7 @@ public class IoUtils {
     static public String toString(InputStream input, String encoding) {
 
         try {
-            return (null == encoding) ? toString(new InputStreamReader(input, "UTF-8"))
+            return (null == encoding) ? toString(new InputStreamReader(input, UTF_8))
                 : toString(new InputStreamReader(input, encoding));
         } catch (Exception e) {
             NAMING_LOGGER.error("NA", "read input failed.", e);