diff --git a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/PolarisConfigAutoConfiguration.java b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/PolarisConfigAutoConfiguration.java
index 13244af84..5f5f78092 100644
--- a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/PolarisConfigAutoConfiguration.java
+++ b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/PolarisConfigAutoConfiguration.java
@@ -66,7 +66,7 @@ public class PolarisConfigAutoConfiguration {
 	public SpringValueProcessor springValueProcessor() {
 		return new SpringValueProcessor();
 	}
-	
+
 	@Bean
 	public SpringValueDefinitionProcessor springValueDefinitionProcessor() {
 		return new SpringValueDefinitionProcessor();
diff --git a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/adapter/PolarisPropertySourceAutoRefresher.java b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/adapter/PolarisPropertySourceAutoRefresher.java
index 415529385..e099c55f7 100644
--- a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/adapter/PolarisPropertySourceAutoRefresher.java
+++ b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/adapter/PolarisPropertySourceAutoRefresher.java
@@ -89,7 +89,6 @@ public class PolarisPropertySourceAutoRefresher
 		this.placeholderHelper = SpringInjector.getInstance(PlaceholderHelper.class);
 		this.typeConverterHasConvertIfNecessaryWithFieldParameter = testTypeConverterHasConvertIfNecessaryWithFieldParameter();
 
-
 	}
 
 	@Override
@@ -136,7 +135,7 @@ public class PolarisPropertySourceAutoRefresher
 
 							Map<String, Object> source = polarisPropertySource
 									.getSource();
-				
+
 							for (String changedKey : configKVFileChangeEvent.changedKeys()) {
 
 								// 1. check whether the changed key is relevant
@@ -164,14 +163,15 @@ public class PolarisPropertySourceAutoRefresher
 
 			LOGGER.info("Auto update polaris changed value successfully, new value: {}, {}", value,
 					springValue);
-		} catch (Throwable ex) {
+		}
+		catch (Throwable ex) {
 			LOGGER.error("Auto update polaris changed value failed, {}", springValue.toString(), ex);
 		}
 	}
 
 
 	/**
-	 * Logic transplanted from DefaultListableBeanFactory
+	 * Logic transplanted from DefaultListableBeanFactory.
 	 *
 	 * @see org.springframework.beans.factory.support.DefaultListableBeanFactory#doResolveDependency(org.springframework.beans.factory.config.DependencyDescriptor,
 	 * java.lang.String, java.util.Set, org.springframework.beans.TypeConverter)
@@ -183,16 +183,19 @@ public class PolarisPropertySourceAutoRefresher
 
 		if (springValue.isJson()) {
 			value = parseJsonValue((String) value, springValue.getTargetType());
-		} else {
+		}
+		else {
 			if (springValue.isField()) {
 				// org.springframework.beans.TypeConverter#convertIfNecessary(java.lang.Object, java.lang.Class, java.lang.reflect.Field) is available from Spring 3.2.0+
 				if (typeConverterHasConvertIfNecessaryWithFieldParameter) {
 					value = this.typeConverter
 							.convertIfNecessary(value, springValue.getTargetType(), springValue.getField());
-				} else {
+				}
+				else {
 					value = this.typeConverter.convertIfNecessary(value, springValue.getTargetType());
 				}
-			} else {
+			}
+			else {
 				value = this.typeConverter.convertIfNecessary(value, springValue.getTargetType(),
 						springValue.getMethodParameter());
 			}
@@ -204,7 +207,8 @@ public class PolarisPropertySourceAutoRefresher
 	private Object parseJsonValue(String json, Class<?> targetType) {
 		try {
 			return JacksonUtils.json2JavaBean(json, targetType);
-		} catch (Throwable ex) {
+		}
+		catch (Throwable ex) {
 			LOGGER.error("Parsing json '{}' to type {} failed!", json, targetType, ex);
 			throw ex;
 		}
@@ -213,7 +217,8 @@ public class PolarisPropertySourceAutoRefresher
 	private boolean testTypeConverterHasConvertIfNecessaryWithFieldParameter() {
 		try {
 			TypeConverter.class.getMethod("convertIfNecessary", Object.class, Class.class, Field.class);
-		} catch (Throwable ex) {
+		}
+		catch (Throwable ex) {
 			return false;
 		}
 		return true;
diff --git a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/annotation/AbstractPolarisProcessor.java b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/annotation/AbstractPolarisProcessor.java
index da3429b7c..ac81f6b96 100644
--- a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/annotation/AbstractPolarisProcessor.java
+++ b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/annotation/AbstractPolarisProcessor.java
@@ -54,13 +54,20 @@ public abstract class AbstractPolarisProcessor implements BeanPostProcessor, Pri
 		return bean;
 	}
 
+
 	/**
-	 * subclass should implement this method to process field
+	 * subclass should implement this method to process field.
+	 * @param bean bean
+	 * @param beanName beanName
+	 * @param field field
 	 */
 	protected abstract void processField(Object bean, String beanName, Field field);
 
 	/**
-	 * subclass should implement this method to process method
+	 * subclass should implement this method to process method.
+	 * @param bean bean
+	 * @param beanName beanName
+	 * @param method method
 	 */
 	protected abstract void processMethod(Object bean, String beanName, Method method);
 
diff --git a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/annotation/SpringValueProcessor.java b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/annotation/SpringValueProcessor.java
index 1428280a9..92f0bf0e2 100644
--- a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/annotation/SpringValueProcessor.java
+++ b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/annotation/SpringValueProcessor.java
@@ -36,7 +36,7 @@ import org.springframework.context.annotation.Bean;
 public class SpringValueProcessor extends AbstractPolarisProcessor implements BeanFactoryPostProcessor, BeanFactoryAware {
 
 	private static final Logger logger = LoggerFactory.getLogger(SpringValueProcessor.class);
-	
+
 	private final PlaceholderHelper placeholderHelper;
 	private final SpringValueRegistry springValueRegistry;
 
@@ -111,10 +111,12 @@ public class SpringValueProcessor extends AbstractPolarisProcessor implements Be
 			if (member instanceof Field) {
 				Field field = (Field) member;
 				springValue = new SpringValue(key, value.value(), bean, beanName, field, false);
-			} else if (member instanceof Method) {
+			}
+			else if (member instanceof Method) {
 				Method method = (Method) member;
 				springValue = new SpringValue(key, value.value(), bean, beanName, method, false);
-			} else {
+			}
+			else {
 				logger.error("polaris @Value annotation currently only support to be used on methods and fields, "
 						+ "but is used on {}", member.getClass());
 				return;
@@ -143,7 +145,8 @@ public class SpringValueProcessor extends AbstractPolarisProcessor implements Be
 						bean, beanName, method, false);
 				springValueRegistry.register(beanFactory, definition.getKey(), springValue);
 				logger.debug("Monitoring {}", springValue);
-			} catch (Throwable ex) {
+			}
+			catch (Throwable ex) {
 				logger.error("Failed to enable auto update feature for {}.{}", bean.getClass(),
 						definition.getPropertyName());
 			}
diff --git a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/property/PlaceholderHelper.java b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/property/PlaceholderHelper.java
index 3d1eb37dc..a272d2bfe 100644
--- a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/property/PlaceholderHelper.java
+++ b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/property/PlaceholderHelper.java
@@ -44,11 +44,13 @@ public class PlaceholderHelper {
 	private static final String EXPRESSION_PREFIX = "#{";
 	private static final String EXPRESSION_SUFFIX = "}";
 
+
 	/**
 	 * Resolve placeholder property values, e.g.
-	 * <br />
-	 * <br />
-	 * "${somePropertyValue}" -> "the actual property value"
+	 * @param beanFactory beanFactory
+	 * @param beanName beanName
+	 * @param placeholder placeholder
+	 * @return "${somePropertyValue}" -> "the actual property value"
 	 */
 	public Object resolvePropertyValue(ConfigurableBeanFactory beanFactory, String beanName, String placeholder) {
 		// resolve string value
@@ -74,6 +76,8 @@ public class PlaceholderHelper {
 
 	/**
 	 * Extract keys from placeholder, e.g.
+	 * @param propertyString propertyString
+	 * @return
 	 * <ul>
 	 * <li>${some.key} => "some.key"</li>
 	 * <li>${some.key:${some.other.key:100}} => "some.key", "some.other.key"</li>
@@ -111,13 +115,15 @@ public class PlaceholderHelper {
 			// ${some.key:other.key}
 			if (placeholderCandidate.startsWith(PLACEHOLDER_PREFIX)) {
 				stack.push(placeholderCandidate);
-			} else {
+			}
+			else {
 				// some.key:${some.other.key:100}
 				int separatorIndex = placeholderCandidate.indexOf(VALUE_SEPARATOR);
 
 				if (separatorIndex == -1) {
 					stack.push(placeholderCandidate);
-				} else {
+				}
+				else {
 					stack.push(placeholderCandidate.substring(0, separatorIndex));
 					String defaultValuePart =
 							normalizeToPlaceholder(placeholderCandidate.substring(separatorIndex + VALUE_SEPARATOR.length()));
@@ -169,13 +175,16 @@ public class PlaceholderHelper {
 				if (withinNestedPlaceholder > 0) {
 					withinNestedPlaceholder--;
 					index = index + PLACEHOLDER_SUFFIX.length();
-				} else {
+				}
+				else {
 					return index;
 				}
-			} else if (StringUtils.substringMatch(buf, index, SIMPLE_PLACEHOLDER_PREFIX)) {
+			}
+			else if (StringUtils.substringMatch(buf, index, SIMPLE_PLACEHOLDER_PREFIX)) {
 				withinNestedPlaceholder++;
 				index = index + SIMPLE_PLACEHOLDER_PREFIX.length();
-			} else {
+			}
+			else {
 				index++;
 			}
 		}
diff --git a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/property/SpringValue.java b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/property/SpringValue.java
index 6e0f3bec9..aa1644a76 100644
--- a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/property/SpringValue.java
+++ b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/property/SpringValue.java
@@ -51,7 +51,7 @@ public class SpringValue {
 		this.placeholder = placeholder;
 		this.targetType = field.getType();
 		this.isJson = isJson;
-		if(isJson){
+		if (isJson) {
 			this.genericType = field.getGenericType();
 		}
 	}
@@ -65,7 +65,7 @@ public class SpringValue {
 		Class<?>[] paramTps = method.getParameterTypes();
 		this.targetType = paramTps[0];
 		this.isJson = isJson;
-		if(isJson){
+		if (isJson) {
 			this.genericType = method.getGenericParameterTypes()[0];
 		}
 	}
@@ -73,7 +73,8 @@ public class SpringValue {
 	public void update(Object newVal) throws IllegalAccessException, InvocationTargetException {
 		if (isField()) {
 			injectField(newVal);
-		} else {
+		}
+		else {
 			injectMethod(newVal);
 		}
 	}
@@ -142,7 +143,8 @@ public class SpringValue {
 		}
 		if (isField()) {
 			return String
-					.format("key: %s, beanName: %s, field: %s.%s", key, beanName, bean.getClass().getName(), field.getName());
+					.format("key: %s, beanName: %s, field: %s.%s", key, beanName, bean.getClass()
+							.getName(), field.getName());
 		}
 		return String.format("key: %s, beanName: %s, method: %s.%s", key, beanName, bean.getClass().getName(),
 				methodParameter.getMethod().getName());
diff --git a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/property/SpringValueRegistry.java b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/property/SpringValueRegistry.java
index 283defb47..ae52282e6 100644
--- a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/property/SpringValueRegistry.java
+++ b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/spring/property/SpringValueRegistry.java
@@ -74,17 +74,19 @@ public class SpringValueRegistry {
 	}
 
 	private void initialize() {
-		Executors.newSingleThreadScheduledExecutor(PolarisThreadFactory.create("SpringValueRegistry", true)).scheduleAtFixedRate(
-				new Runnable() {
-					@Override
-					public void run() {
-						try {
-							scanAndClean();
-						} catch (Throwable ex) {
-							logger.error(ex.getMessage(), ex);
-						}
-					}
-				}, CLEAN_INTERVAL_IN_SECONDS, CLEAN_INTERVAL_IN_SECONDS, TimeUnit.SECONDS);
+		Executors.newSingleThreadScheduledExecutor(PolarisThreadFactory.create("SpringValueRegistry", true))
+				.scheduleAtFixedRate(
+						new Runnable() {
+							@Override
+							public void run() {
+								try {
+									scanAndClean();
+								}
+								catch (Throwable ex) {
+									logger.error(ex.getMessage(), ex);
+								}
+							}
+						}, CLEAN_INTERVAL_IN_SECONDS, CLEAN_INTERVAL_IN_SECONDS, TimeUnit.SECONDS);
 	}
 
 	private void scanAndClean() {
diff --git a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/util/SpringInjector.java b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/util/SpringInjector.java
index da408e145..72fe9070b 100644
--- a/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/util/SpringInjector.java
+++ b/spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/util/SpringInjector.java
@@ -41,7 +41,8 @@ public class SpringInjector {
 				if (s_injector == null) {
 					try {
 						s_injector = Guice.createInjector(new SpringModule());
-					} catch (Throwable ex) {
+					}
+					catch (Throwable ex) {
 						PolarisConfigException exception = new PolarisConfigException("Unable to initialize Apollo Spring Injector!", ex);
 						throw exception;
 					}
@@ -55,7 +56,8 @@ public class SpringInjector {
 	public static <T> T getInstance(Class<T> clazz) {
 		try {
 			return getInjector().getInstance(clazz);
-		} catch (Throwable ex) {
+		}
+		catch (Throwable ex) {
 			throw new PolarisConfigException(
 					String.format("Unable to load instance for %s!", clazz.getName()), ex);
 		}
diff --git a/spring-cloud-tencent-commons/src/main/java/com/tencent/cloud/common/util/PolarisThreadFactory.java b/spring-cloud-tencent-commons/src/main/java/com/tencent/cloud/common/util/PolarisThreadFactory.java
index bba354eef..cb23adc12 100644
--- a/spring-cloud-tencent-commons/src/main/java/com/tencent/cloud/common/util/PolarisThreadFactory.java
+++ b/spring-cloud-tencent-commons/src/main/java/com/tencent/cloud/common/util/PolarisThreadFactory.java
@@ -15,7 +15,7 @@ import org.slf4j.LoggerFactory;
  *@date : 2022/6/28 09:26
  *@description:
  */
-public class PolarisThreadFactory implements ThreadFactory {
+public final class PolarisThreadFactory implements ThreadFactory {
 	private static Logger log = LoggerFactory.getLogger(PolarisThreadFactory.class);
 
 	private final AtomicLong threadNumber = new AtomicLong(1);
@@ -53,10 +53,12 @@ public class PolarisThreadFactory implements ThreadFactory {
 				log.info("Alive polaris threads: {}", alives);
 				try {
 					TimeUnit.SECONDS.sleep(2);
-				} catch (InterruptedException ex) {
+				}
+				catch (InterruptedException ex) {
 					// ignore
 				}
-			} else {
+			}
+			else {
 				log.info("All polaris threads are shutdown.");
 				return true;
 			}
@@ -66,9 +68,6 @@ public class PolarisThreadFactory implements ThreadFactory {
 		return false;
 	}
 
-	private interface ClassifyStandard<T> {
-		boolean satisfy(T thread);
-	}
 
 	private static <T> void classify(Set<T> src, Set<T> des, ClassifyStandard<T> standard) {
 		Set<T> set = new HashSet<>();
@@ -87,7 +86,7 @@ public class PolarisThreadFactory implements ThreadFactory {
 	}
 
 	public Thread newThread(Runnable runnable) {
-		Thread thread = new Thread(threadGroup, runnable,//
+		Thread thread = new Thread(threadGroup, runnable,
 				threadGroup.getName() + "-" + namePrefix + "-" + threadNumber.getAndIncrement());
 		thread.setDaemon(daemon);
 		if (thread.getPriority() != Thread.NORM_PRIORITY) {
@@ -95,4 +94,9 @@ public class PolarisThreadFactory implements ThreadFactory {
 		}
 		return thread;
 	}
+
+	private interface ClassifyStandard<T> {
+		boolean satisfy(T thread);
+	}
+
 }
diff --git a/spring-cloud-tencent-examples/polaris-config-example/src/main/resources/bootstrap.yml b/spring-cloud-tencent-examples/polaris-config-example/src/main/resources/bootstrap.yml
index 38ed7eed0..c8652b23a 100644
--- a/spring-cloud-tencent-examples/polaris-config-example/src/main/resources/bootstrap.yml
+++ b/spring-cloud-tencent-examples/polaris-config-example/src/main/resources/bootstrap.yml
@@ -2,11 +2,11 @@ server:
   port: 48084
 spring:
   application:
-    name: polaris-config-example
+    name: xiaozou
   cloud:
     polaris:
       address: grpc://183.47.111.80:8091
-      namespace: default
+      namespace: xiaozou
       config:
         auto-refresh: true # auto refresh when config file changed
         groups: