diff --git a/hippo4j-common/src/main/java/cn/hippo4j/common/toolkit/JSONUtil.java b/hippo4j-common/src/main/java/cn/hippo4j/common/toolkit/JSONUtil.java
index a4392891..fd6d9131 100644
--- a/hippo4j-common/src/main/java/cn/hippo4j/common/toolkit/JSONUtil.java
+++ b/hippo4j-common/src/main/java/cn/hippo4j/common/toolkit/JSONUtil.java
@@ -20,6 +20,7 @@ package cn.hippo4j.common.toolkit;
 import cn.hippo4j.common.api.JsonFacade;
 import com.fasterxml.jackson.core.type.TypeReference;
 
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -52,7 +53,7 @@ public class JSONUtil {
 
     public static <T> List<T> parseArray(String text, Class<T> clazz) {
         if (StringUtil.isBlank(text)) {
-            return null;
+            return Collections.emptyList();
         }
         return JSON_FACADE.parseArray(text, clazz);
     }
diff --git a/hippo4j-common/src/test/java/cn/hippo4j/common/toolkit/JSONUtilTest.java b/hippo4j-common/src/test/java/cn/hippo4j/common/toolkit/JSONUtilTest.java
index 1bb988d0..e01ff4cd 100644
--- a/hippo4j-common/src/test/java/cn/hippo4j/common/toolkit/JSONUtilTest.java
+++ b/hippo4j-common/src/test/java/cn/hippo4j/common/toolkit/JSONUtilTest.java
@@ -26,6 +26,7 @@ import org.junit.Assert;
 import org.junit.Test;
 
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 public class JSONUtilTest {
@@ -65,8 +66,8 @@ public class JSONUtilTest {
 
     @Test
     public void assertParseArray() {
-        Assert.assertNull(JSONUtil.parseArray(null, Foo.class));
-        Assert.assertNull(JSONUtil.parseArray("  ", Foo.class));
+        Assert.assertEquals(Collections.emptyList(), JSONUtil.parseArray(null, Foo.class));
+        Assert.assertEquals(Collections.emptyList(), JSONUtil.parseArray("  ", Foo.class));
         Assert.assertEquals(
                 EXPECTED_FOO_ARRAY,
                 JSONUtil.parseArray(EXPECTED_FOO_JSON_ARRAY, Foo.class));
diff --git a/hippo4j-core/src/main/java/cn/hippo4j/core/executor/DynamicThreadPoolWrapper.java b/hippo4j-core/src/main/java/cn/hippo4j/core/executor/DynamicThreadPoolWrapper.java
index a8827549..a99b0b37 100644
--- a/hippo4j-core/src/main/java/cn/hippo4j/core/executor/DynamicThreadPoolWrapper.java
+++ b/hippo4j-core/src/main/java/cn/hippo4j/core/executor/DynamicThreadPoolWrapper.java
@@ -51,6 +51,7 @@ public class DynamicThreadPoolWrapper implements DisposableBean {
     public DynamicThreadPoolWrapper(String threadPoolId, ThreadPoolExecutor threadPoolExecutor) {
         this.threadPoolId = threadPoolId;
         this.executor = threadPoolExecutor;
+        this.subscribeFlag = true;
     }
 
     public void execute(Runnable command) {
@@ -67,7 +68,7 @@ public class DynamicThreadPoolWrapper implements DisposableBean {
 
     @Override
     public void destroy() throws Exception {
-        if (executor != null && executor instanceof AbstractDynamicExecutorSupport) {
+        if (executor instanceof AbstractDynamicExecutorSupport) {
             ((AbstractDynamicExecutorSupport) executor).destroy();
         }
     }
diff --git a/hippo4j-spring-boot/hippo4j-config-spring-boot-starter/src/main/java/cn/hippo4j/config/springboot/starter/support/DynamicThreadPoolPostProcessor.java b/hippo4j-spring-boot/hippo4j-config-spring-boot-starter/src/main/java/cn/hippo4j/config/springboot/starter/support/DynamicThreadPoolPostProcessor.java
index 04190dd0..c426f3ad 100644
--- a/hippo4j-spring-boot/hippo4j-config-spring-boot-starter/src/main/java/cn/hippo4j/config/springboot/starter/support/DynamicThreadPoolPostProcessor.java
+++ b/hippo4j-spring-boot/hippo4j-config-spring-boot-starter/src/main/java/cn/hippo4j/config/springboot/starter/support/DynamicThreadPoolPostProcessor.java
@@ -204,17 +204,17 @@ public final class DynamicThreadPoolPostProcessor implements BeanPostProcessor {
     private ThreadPoolNotifyAlarm buildThreadPoolNotifyAlarm(ExecutorProperties executorProperties) {
         DynamicThreadPoolNotifyProperties notify = Optional.ofNullable(executorProperties).map(ExecutorProperties::getNotify).orElse(null);
         boolean isAlarm = Optional.ofNullable(executorProperties.getAlarm())
-                .orElseGet(() -> Optional.ofNullable(configProperties.getDefaultExecutor()).map(each -> each.getAlarm()).orElse(true));
+                .orElseGet(() -> Optional.ofNullable(configProperties.getDefaultExecutor()).map(ExecutorProperties::getAlarm).orElse(true));
         int activeAlarm = Optional.ofNullable(executorProperties.getActiveAlarm())
-                .orElseGet(() -> Optional.ofNullable(configProperties.getDefaultExecutor()).map(each -> each.getActiveAlarm()).orElse(80));
+                .orElseGet(() -> Optional.ofNullable(configProperties.getDefaultExecutor()).map(ExecutorProperties::getActiveAlarm).orElse(80));
         int capacityAlarm = Optional.ofNullable(executorProperties.getCapacityAlarm())
-                .orElseGet(() -> Optional.ofNullable(configProperties.getDefaultExecutor()).map(each -> each.getCapacityAlarm()).orElse(80));
+                .orElseGet(() -> Optional.ofNullable(configProperties.getDefaultExecutor()).map(ExecutorProperties::getCapacityAlarm).orElse(80));
         int interval = Optional.ofNullable(notify)
-                .map(each -> each.getInterval())
-                .orElseGet(() -> Optional.ofNullable(configProperties.getDefaultExecutor()).map(each -> each.getNotify()).map(each -> each.getInterval()).orElse(5));
+                .map(DynamicThreadPoolNotifyProperties::getInterval)
+                .orElseGet(() -> Optional.ofNullable(configProperties.getDefaultExecutor()).map(ExecutorProperties::getNotify).map(DynamicThreadPoolNotifyProperties::getInterval).orElse(5));
         String receive = Optional.ofNullable(notify)
-                .map(each -> each.getReceives())
-                .orElseGet(() -> Optional.ofNullable(configProperties.getDefaultExecutor()).map(each -> each.getNotify()).map(each -> each.getReceives()).orElse(""));
+                .map(DynamicThreadPoolNotifyProperties::getReceives)
+                .orElseGet(() -> Optional.ofNullable(configProperties.getDefaultExecutor()).map(ExecutorProperties::getNotify).map(DynamicThreadPoolNotifyProperties::getReceives).orElse(""));
         ThreadPoolNotifyAlarm threadPoolNotifyAlarm = new ThreadPoolNotifyAlarm(isAlarm, activeAlarm, capacityAlarm);
         threadPoolNotifyAlarm.setInterval(interval);
         threadPoolNotifyAlarm.setReceives(receive);
diff --git a/hippo4j-spring-boot/hippo4j-spring-boot-starter/src/main/java/cn/hippo4j/springboot/starter/core/DynamicThreadPoolSubscribeConfig.java b/hippo4j-spring-boot/hippo4j-spring-boot-starter/src/main/java/cn/hippo4j/springboot/starter/core/DynamicThreadPoolSubscribeConfig.java
index 6e57b6f4..5a087427 100644
--- a/hippo4j-spring-boot/hippo4j-spring-boot-starter/src/main/java/cn/hippo4j/springboot/starter/core/DynamicThreadPoolSubscribeConfig.java
+++ b/hippo4j-spring-boot/hippo4j-spring-boot-starter/src/main/java/cn/hippo4j/springboot/starter/core/DynamicThreadPoolSubscribeConfig.java
@@ -53,7 +53,7 @@ public class DynamicThreadPoolSubscribeConfig {
             .build();
 
     public void subscribeConfig(String threadPoolId) {
-        subscribeConfig(threadPoolId, config -> threadPoolDynamicRefresh.dynamicRefresh(config));
+        subscribeConfig(threadPoolId, threadPoolDynamicRefresh::dynamicRefresh);
     }
 
     public void subscribeConfig(String threadPoolId, ThreadPoolSubscribeCallback threadPoolSubscribeCallback) {
diff --git a/hippo4j-spring-boot/hippo4j-spring-boot-starter/src/main/java/cn/hippo4j/springboot/starter/support/DynamicThreadPoolPostProcessor.java b/hippo4j-spring-boot/hippo4j-spring-boot-starter/src/main/java/cn/hippo4j/springboot/starter/support/DynamicThreadPoolPostProcessor.java
index 80d147c5..e75fab27 100644
--- a/hippo4j-spring-boot/hippo4j-spring-boot-starter/src/main/java/cn/hippo4j/springboot/starter/support/DynamicThreadPoolPostProcessor.java
+++ b/hippo4j-spring-boot/hippo4j-spring-boot-starter/src/main/java/cn/hippo4j/springboot/starter/support/DynamicThreadPoolPostProcessor.java
@@ -130,7 +130,6 @@ public final class DynamicThreadPoolPostProcessor implements BeanPostProcessor {
         queryStrMap.put(TP_ID, threadPoolId);
         queryStrMap.put(ITEM_ID, properties.getItemId());
         queryStrMap.put(NAMESPACE, properties.getNamespace());
-        boolean isSubscribe = false;
         ThreadPoolExecutor newDynamicThreadPoolExecutor = null;
         ThreadPoolParameterInfo threadPoolParameterInfo = new ThreadPoolParameterInfo();
         try {
@@ -167,7 +166,6 @@ public final class DynamicThreadPoolPostProcessor implements BeanPostProcessor {
                         ((DynamicThreadPoolExecutor) newDynamicThreadPoolExecutor).setExecuteTimeOut(executeTimeOut);
                     }
                     dynamicThreadPoolWrapper.setExecutor(newDynamicThreadPoolExecutor);
-                    isSubscribe = true;
                 }
             } else {
                 // DynamicThreadPool configuration undefined in server
@@ -197,8 +195,6 @@ public final class DynamicThreadPoolPostProcessor implements BeanPostProcessor {
             if (Objects.isNull(executor)) {
                 dynamicThreadPoolWrapper.setExecutor(CommonDynamicThreadPool.getInstance(threadPoolId));
             }
-            // Set whether to subscribe to the remote thread pool configuration.
-            dynamicThreadPoolWrapper.setSubscribeFlag(isSubscribe);
         }
         GlobalThreadPoolManage.register(dynamicThreadPoolWrapper.getThreadPoolId(), threadPoolParameterInfo, dynamicThreadPoolWrapper);
         return newDynamicThreadPoolExecutor;