diff --git a/infra/common/src/test/java/cn/hippo4j/common/executor/support/ThreadPoolExecutorUtilTest.java b/infra/common/src/test/java/cn/hippo4j/common/executor/support/ThreadPoolExecutorUtilTest.java
index 97383037..88f523bb 100644
--- a/infra/common/src/test/java/cn/hippo4j/common/executor/support/ThreadPoolExecutorUtilTest.java
+++ b/infra/common/src/test/java/cn/hippo4j/common/executor/support/ThreadPoolExecutorUtilTest.java
@@ -45,12 +45,11 @@ public class ThreadPoolExecutorUtilTest {
                 maxPoolSize,
                 1L,
                 TimeUnit.SECONDS,
-                new ArrayBlockingQueue<>(10)
-        );
+                new ArrayBlockingQueue<>(10));
     }
 
     @Test
-    public void testEquals(){
+    public void testEquals() {
         // Test when the new core pool size equals the original maximum pool size.
         int newCorePoolSize1 = maxPoolSize;
         int newMaxPoolSize1 = 6;
@@ -60,7 +59,7 @@ public class ThreadPoolExecutorUtilTest {
     }
 
     @Test
-    public void testGreater(){
+    public void testGreater() {
         // Test when the new core pool size is greater than the original maximum pool size.
         int newCorePoolSize2 = 8;
         int newMaxPoolSize2 = 10;
@@ -70,7 +69,7 @@ public class ThreadPoolExecutorUtilTest {
     }
 
     @Test
-    public void testLess(){
+    public void testLess() {
         // Test when the new core pool size is less than the original maximum pool size.
         int newCorePoolSize3 = 3;
         int newMaxPoolSize3 = 5;
@@ -80,7 +79,7 @@ public class ThreadPoolExecutorUtilTest {
     }
 
     @Test
-    public void testException(){
+    public void testException() {
         // Test when the new core pool size is greater than the new maximum pool size, which should throw an IllegalArgumentException.
         int newCorePoolSize4 = 6;
         int newMaxPoolSize4 = 4;
@@ -89,7 +88,7 @@ public class ThreadPoolExecutorUtilTest {
         } catch (IllegalArgumentException e) {
             // Expected to throw an exception.
             Assert.assertEquals("newCorePoolSize must be smaller than newMaximumPoolSize", e.getMessage());
-            log.error("newCorePoolSize must be smaller than newMaximumPoolSize;{}",e.getMessage());
+            log.error("newCorePoolSize must be smaller than newMaximumPoolSize;{}", e.getMessage());
         }
     }
 }
diff --git a/starters/threadpool/monitor/hippo4j-spring-boot-starter-monitor-micrometer/src/main/java/cn/hippo4j/springboot/starter/monitor/micrometer/MicrometerMonitorAutoConfiguration.java b/starters/threadpool/monitor/hippo4j-spring-boot-starter-monitor-micrometer/src/main/java/cn/hippo4j/springboot/starter/monitor/micrometer/MicrometerMonitorAutoConfiguration.java
index 1eb7b70b..73834bb8 100644
--- a/starters/threadpool/monitor/hippo4j-spring-boot-starter-monitor-micrometer/src/main/java/cn/hippo4j/springboot/starter/monitor/micrometer/MicrometerMonitorAutoConfiguration.java
+++ b/starters/threadpool/monitor/hippo4j-spring-boot-starter-monitor-micrometer/src/main/java/cn/hippo4j/springboot/starter/monitor/micrometer/MicrometerMonitorAutoConfiguration.java
@@ -27,7 +27,6 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.boot.autoconfigure.AutoConfigureBefore;
 
 /**
  * Micrometer monitor auto configuration.
diff --git a/starters/threadpool/server/src/main/java/cn/hippo4j/springboot/starter/support/AdaptedThreadPoolDestroyPostProcessor.java b/starters/threadpool/server/src/main/java/cn/hippo4j/springboot/starter/support/AdaptedThreadPoolDestroyPostProcessor.java
index ce425560..9b60a4f6 100644
--- a/starters/threadpool/server/src/main/java/cn/hippo4j/springboot/starter/support/AdaptedThreadPoolDestroyPostProcessor.java
+++ b/starters/threadpool/server/src/main/java/cn/hippo4j/springboot/starter/support/AdaptedThreadPoolDestroyPostProcessor.java
@@ -81,14 +81,14 @@ public class AdaptedThreadPoolDestroyPostProcessor implements DestructionAwareBe
     @Override
     public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
         // forked default implementation from spring-beans-5.1.14.RELEASE.jar
-        // org.springframework.beans.factory.config.BeanPostProcessor#postProcessBeforeInitialization 
+        // org.springframework.beans.factory.config.BeanPostProcessor#postProcessBeforeInitialization
         return bean;
     }
 
     @Override
     public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
         // forked default implementation from spring-beans-5.1.14.RELEASE.jar
-        // org.springframework.beans.factory.config.BeanPostProcessor#postProcessAfterInitialization 
+        // org.springframework.beans.factory.config.BeanPostProcessor#postProcessAfterInitialization
         return bean;
     }
 
diff --git a/threadpool/monitor/micrometer/src/main/java/cn/hippo4j/monitor/micrometer/AdapterThreadPoolMicrometerMonitorHandler.java b/threadpool/monitor/micrometer/src/main/java/cn/hippo4j/monitor/micrometer/AdapterThreadPoolMicrometerMonitorHandler.java
index ea993663..fe28dc21 100644
--- a/threadpool/monitor/micrometer/src/main/java/cn/hippo4j/monitor/micrometer/AdapterThreadPoolMicrometerMonitorHandler.java
+++ b/threadpool/monitor/micrometer/src/main/java/cn/hippo4j/monitor/micrometer/AdapterThreadPoolMicrometerMonitorHandler.java
@@ -58,7 +58,9 @@ public class AdapterThreadPoolMicrometerMonitorHandler extends AbstractAdapterTh
                 Tag.of(APPLICATION_NAME_TAG, applicationName));
         Metrics.gauge(metricName("core.size"), tags, threadPoolAdapterState, ThreadPoolAdapterState::getCoreSize);
         Metrics.gauge(metricName("maximum.size"), tags, threadPoolAdapterState, ThreadPoolAdapterState::getMaximumSize);
-        Metrics.gauge(metricName("queue.capacity"), tags, threadPoolAdapterState, ThreadPoolAdapterState::getBlockingQueueCapacity);
+        if (threadPoolAdapterState.getBlockingQueueCapacity() != null) {
+            Metrics.gauge(metricName("queue.capacity"), tags, threadPoolAdapterState, ThreadPoolAdapterState::getBlockingQueueCapacity);
+        }
     }
 
     private String metricName(String name) {
diff --git a/threadpool/server/common/src/test/java/cn/hippo4j/server/common/base/ServiceExceptionTest.java b/threadpool/server/common/src/test/java/cn/hippo4j/server/common/base/ServiceExceptionTest.java
index fc55129b..833afe1b 100644
--- a/threadpool/server/common/src/test/java/cn/hippo4j/server/common/base/ServiceExceptionTest.java
+++ b/threadpool/server/common/src/test/java/cn/hippo4j/server/common/base/ServiceExceptionTest.java
@@ -32,14 +32,14 @@ import java.util.Objects;
 public class ServiceExceptionTest {
 
     @Test
-    public void ServiceExceptionTest1(){
+    public void ServiceExceptionTest1() {
         ServiceException serviceException = new ServiceException();
         Assert.isTrue(Objects.equals(serviceException.getErrorCode().getCode(), "3"));
         Assert.isTrue(Objects.equals(serviceException.getMessage(), "SERVICE_ERROR"));
     }
 
     @Test
-    public void ServiceExceptionTest2(){
+    public void ServiceExceptionTest2() {
         ErrorCode errorCode = ErrorCodeEnum.LOGIN_TIMEOUT;
         ServiceException serviceException = new ServiceException(errorCode);
         Assert.isTrue(Objects.equals(serviceException.getErrorCode().getCode(), ErrorCodeEnum.LOGIN_TIMEOUT.getCode()));
@@ -47,21 +47,21 @@ public class ServiceExceptionTest {
     }
 
     @Test
-    public void ServiceExceptionTest3(){
+    public void ServiceExceptionTest3() {
         String message = ErrorCodeEnum.SERVICE_ERROR.getMessage();
         ServiceException serviceException = new ServiceException(message);
         Assert.isTrue(Objects.equals(serviceException.getMessage(), message));
     }
 
     @Test
-    public void ServiceExceptionTest4(){
+    public void ServiceExceptionTest4() {
         Throwable cause = new Throwable();
         ServiceException serviceException = new ServiceException(cause);
         Assert.isTrue(Objects.equals(serviceException.getCause().getMessage(), cause.getMessage()));
     }
 
     @Test
-    public void ServiceExceptionTest5(){
+    public void ServiceExceptionTest5() {
         String message = ErrorCodeEnum.SERVICE_ERROR.getMessage();
         Throwable cause = new Throwable();
         ServiceException serviceException = new ServiceException(message, cause);
@@ -70,7 +70,7 @@ public class ServiceExceptionTest {
     }
 
     @Test
-    public void ServiceExceptionTest6(){
+    public void ServiceExceptionTest6() {
         String message = ErrorCodeEnum.SERVICE_ERROR.getMessage();
         Throwable cause = new Throwable();
         ServiceException serviceException = new ServiceException(cause, message);
@@ -79,7 +79,7 @@ public class ServiceExceptionTest {
     }
 
     @Test
-    public void ServiceExceptionTest7(){
+    public void ServiceExceptionTest7() {
         Throwable cause = new Throwable();
         ErrorCode errorCode = ErrorCodeEnum.LOGIN_TIMEOUT;
         ServiceException serviceException = new ServiceException(cause, errorCode);
@@ -88,7 +88,7 @@ public class ServiceExceptionTest {
     }
 
     @Test
-    public void ServiceExceptionTest8(){
+    public void ServiceExceptionTest8() {
         Throwable cause = new Throwable();
         ErrorCode errorCode = ErrorCodeEnum.LOGIN_TIMEOUT;
         String message = ErrorCodeEnum.SERVICE_ERROR.getMessage();