diff --git a/spring-cloud-starter-tencent-metadata-transfer/src/main/java/com/tencent/cloud/metadata/core/CustomTransitiveMetadataResolver.java b/spring-cloud-starter-tencent-metadata-transfer/src/main/java/com/tencent/cloud/metadata/core/CustomTransitiveMetadataResolver.java
index a5a11c892..955ce6809 100644
--- a/spring-cloud-starter-tencent-metadata-transfer/src/main/java/com/tencent/cloud/metadata/core/CustomTransitiveMetadataResolver.java
+++ b/spring-cloud-starter-tencent-metadata-transfer/src/main/java/com/tencent/cloud/metadata/core/CustomTransitiveMetadataResolver.java
@@ -36,10 +36,11 @@ import org.springframework.web.server.ServerWebExchange;
  *
  * @author lepdou 2022-05-20
  */
-public class CustomTransitiveMetadataResolver {
-
+public final class CustomTransitiveMetadataResolver {
 	private static final String TRANSITIVE_HEADER_PREFIX = "X-SCT-Metadata-Transitive-";
 	private static final int TRANSITIVE_HEADER_PREFIX_LENGTH = TRANSITIVE_HEADER_PREFIX.length();
+	private CustomTransitiveMetadataResolver() {
+	}
 
 	public static Map<String, String> resolve(ServerWebExchange exchange) {
 		Map<String, String> result = new HashMap<>();
diff --git a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/listener/PolarisConfigListenerContext.java b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/listener/PolarisConfigListenerContext.java
index 5a941df34..74e20fb9c 100644
--- a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/listener/PolarisConfigListenerContext.java
+++ b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/listener/PolarisConfigListenerContext.java
@@ -55,37 +55,34 @@ import static com.tencent.polaris.configuration.api.core.ChangeType.MODIFIED;
  * @author Palmer Xu 2022-06-06
  */
 public final class PolarisConfigListenerContext {
-
 	/**
 	 * Logger instance.
 	 */
 	private static final Logger LOG = LoggerFactory.getLogger(PolarisConfigListenerContext.class);
-
 	/**
 	 * Execute service Atomic Reference Cache .
 	 */
 	private static final AtomicReference<ExecutorService> EAR = new AtomicReference<>();
-
 	/**
 	 * All custom {@link ConfigChangeListener} instance defined in application .
 	 */
 	private static final List<ConfigChangeListener> listeners = Lists.newCopyOnWriteArrayList();
-
 	/**
 	 * All custom interested keys defined in application .
 	 */
 	private static final Map<ConfigChangeListener, Set<String>> interestedKeys = Maps.newHashMap();
-
 	/**
 	 * All custom interested key prefixes defined in application .
 	 */
 	private static final Map<ConfigChangeListener, Set<String>> interestedKeyPrefixes = Maps.newHashMap();
-
 	/**
 	 * Cache all latest configuration information for users in the application environment .
 	 */
 	private static final Cache<String, Object> properties = CacheBuilder.newBuilder().build();
 
+	private PolarisConfigListenerContext() {
+	}
+
 	/**
 	 * Get or Created new execute server .
 	 * @return execute service instance of {@link ExecutorService}
diff --git a/spring-cloud-starter-tencent-polaris-router/src/main/java/com/tencent/cloud/polaris/router/RouterConstants.java b/spring-cloud-starter-tencent-polaris-router/src/main/java/com/tencent/cloud/polaris/router/RouterConstants.java
index 6437c83e8..943ffa182 100644
--- a/spring-cloud-starter-tencent-polaris-router/src/main/java/com/tencent/cloud/polaris/router/RouterConstants.java
+++ b/spring-cloud-starter-tencent-polaris-router/src/main/java/com/tencent/cloud/polaris/router/RouterConstants.java
@@ -21,12 +21,14 @@ package com.tencent.cloud.polaris.router;
 /**
  * Router constants.
  *
- *@author lepdou 2022-05-17
+ * @author lepdou 2022-05-17
  */
-public class RouterConstants {
-
+public final class RouterConstants {
 	/**
 	 * the header of router label.
 	 */
 	public static final String ROUTER_LABEL_HEADER = "internal-router-label";
+
+	private RouterConstants() {
+	}
 }
diff --git a/spring-cloud-starter-tencent-polaris-router/src/main/java/com/tencent/cloud/polaris/router/feign/FeignExpressionLabelUtils.java b/spring-cloud-starter-tencent-polaris-router/src/main/java/com/tencent/cloud/polaris/router/feign/FeignExpressionLabelUtils.java
index 92b8a6608..152ffcc9c 100644
--- a/spring-cloud-starter-tencent-polaris-router/src/main/java/com/tencent/cloud/polaris/router/feign/FeignExpressionLabelUtils.java
+++ b/spring-cloud-starter-tencent-polaris-router/src/main/java/com/tencent/cloud/polaris/router/feign/FeignExpressionLabelUtils.java
@@ -33,9 +33,13 @@ import org.springframework.util.CollectionUtils;
 
 /**
  * Resolve rule expression label from feign request.
+ *
  * @author lepdou 2022-05-20
  */
-public class FeignExpressionLabelUtils {
+public final class FeignExpressionLabelUtils {
+
+	private FeignExpressionLabelUtils() {
+	}
 
 	public static Map<String, String> resolve(RequestTemplate request, Set<String> labelKeys) {
 		if (CollectionUtils.isEmpty(labelKeys)) {
diff --git a/spring-cloud-tencent-commons/src/test/resources/test.txt b/spring-cloud-tencent-commons/src/test/resources/test.txt
index 63d3c2d75..e18c37483 100644
--- a/spring-cloud-tencent-commons/src/test/resources/test.txt
+++ b/spring-cloud-tencent-commons/src/test/resources/test.txt
@@ -1 +1 @@
-just for test
+just for test
\ No newline at end of file