diff --git a/dubbo-common/src/main/java/org/apache/dubbo/common/serialization/ClassHolder.java b/dubbo-common/src/main/java/org/apache/dubbo/common/serialization/ClassHolder.java
index adb34ad5656..4dd61511e4c 100644
--- a/dubbo-common/src/main/java/org/apache/dubbo/common/serialization/ClassHolder.java
+++ b/dubbo-common/src/main/java/org/apache/dubbo/common/serialization/ClassHolder.java
@@ -1,19 +1,34 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.apache.dubbo.common.serialization;
 
 import org.apache.dubbo.common.utils.ConcurrentHashSet;
 
-import java.util.ArrayList;
-import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.CopyOnWriteArrayList;
 
 public class ClassHolder {
     private final Map<String, Set<Class<?>>> classCache = new ConcurrentHashMap<>();
 
     public void storeClass(Class<?> clazz) {
-        classCache.computeIfAbsent(clazz.getName(), k -> new ConcurrentHashSet<>()).add(clazz);
+        classCache
+                .computeIfAbsent(clazz.getName(), k -> new ConcurrentHashSet<>())
+                .add(clazz);
     }
 
     public Class<?> loadClass(String className, ClassLoader classLoader) {
diff --git a/dubbo-common/src/main/java/org/apache/dubbo/common/utils/DefaultSerializeClassChecker.java b/dubbo-common/src/main/java/org/apache/dubbo/common/utils/DefaultSerializeClassChecker.java
index c736068c888..029f654abd2 100644
--- a/dubbo-common/src/main/java/org/apache/dubbo/common/utils/DefaultSerializeClassChecker.java
+++ b/dubbo-common/src/main/java/org/apache/dubbo/common/utils/DefaultSerializeClassChecker.java
@@ -50,7 +50,8 @@ public class DefaultSerializeClassChecker implements AllowClassNotifyListener {
     public DefaultSerializeClassChecker(FrameworkModel frameworkModel) {
         serializeSecurityManager = frameworkModel.getBeanFactory().getOrRegisterBean(SerializeSecurityManager.class);
         serializeSecurityManager.registerListener(this);
-        classHolder = NativeDetector.inNativeImage() ? frameworkModel.getBeanFactory().getBean(ClassHolder.class) : null;
+        classHolder =
+                NativeDetector.inNativeImage() ? frameworkModel.getBeanFactory().getBean(ClassHolder.class) : null;
     }
 
     @Override
diff --git a/dubbo-common/src/main/java/org/apache/dubbo/common/utils/SerializeSecurityConfigurator.java b/dubbo-common/src/main/java/org/apache/dubbo/common/utils/SerializeSecurityConfigurator.java
index b7e8b3ff2d1..ea80a698a68 100644
--- a/dubbo-common/src/main/java/org/apache/dubbo/common/utils/SerializeSecurityConfigurator.java
+++ b/dubbo-common/src/main/java/org/apache/dubbo/common/utils/SerializeSecurityConfigurator.java
@@ -66,7 +66,8 @@ public SerializeSecurityConfigurator(ModuleModel moduleModel) {
 
         FrameworkModel frameworkModel = moduleModel.getApplicationModel().getFrameworkModel();
         serializeSecurityManager = frameworkModel.getBeanFactory().getBean(SerializeSecurityManager.class);
-        classHolder = NativeDetector.inNativeImage() ? frameworkModel.getBeanFactory().getBean(ClassHolder.class) : null;
+        classHolder =
+                NativeDetector.inNativeImage() ? frameworkModel.getBeanFactory().getBean(ClassHolder.class) : null;
 
         refreshStatus();
         refreshCheck();