diff --git a/client/src/main/java/org/apache/rocketmq/client/impl/consumer/RebalanceService.java b/client/src/main/java/org/apache/rocketmq/client/impl/consumer/RebalanceService.java
index c4d2951aba8bce0669d006382046ff3b77695d76..fab07cb36e0f0976ca08bf77cb92c4b5eb56ead2 100644
--- a/client/src/main/java/org/apache/rocketmq/client/impl/consumer/RebalanceService.java
+++ b/client/src/main/java/org/apache/rocketmq/client/impl/consumer/RebalanceService.java
@@ -21,9 +21,6 @@ import org.apache.rocketmq.client.log.ClientLogger;
 import org.apache.rocketmq.common.ServiceThread;
 import org.slf4j.Logger;
 
-/**
- * Rebalance Service
- */
 public class RebalanceService extends ServiceThread {
     private static long waitInterval =
         Long.parseLong(System.getProperty(
diff --git a/client/src/main/java/org/apache/rocketmq/client/producer/LocalTransactionExecuter.java b/client/src/main/java/org/apache/rocketmq/client/producer/LocalTransactionExecuter.java
index 0c22c3ea6b4f394b28ed19fad8ad812fb1f34a3c..80b5546925fee85484151985aee052107f59e49e 100644
--- a/client/src/main/java/org/apache/rocketmq/client/producer/LocalTransactionExecuter.java
+++ b/client/src/main/java/org/apache/rocketmq/client/producer/LocalTransactionExecuter.java
@@ -19,5 +19,5 @@ package org.apache.rocketmq.client.producer;
 import org.apache.rocketmq.common.message.Message;
 
 public interface LocalTransactionExecuter {
-    public LocalTransactionState executeLocalTransactionBranch(final Message msg, final Object arg);
+    LocalTransactionState executeLocalTransactionBranch(final Message msg, final Object arg);
 }
diff --git a/client/src/main/java/org/apache/rocketmq/client/producer/SendCallback.java b/client/src/main/java/org/apache/rocketmq/client/producer/SendCallback.java
index 1adf1834d91a1f5b4780469903222623deb1b38c..a85fa699c8fa7f69a740f89988062a90591d42fb 100644
--- a/client/src/main/java/org/apache/rocketmq/client/producer/SendCallback.java
+++ b/client/src/main/java/org/apache/rocketmq/client/producer/SendCallback.java
@@ -17,7 +17,7 @@
 package org.apache.rocketmq.client.producer;
 
 public interface SendCallback {
-    public void onSuccess(final SendResult sendResult);
+    void onSuccess(final SendResult sendResult);
 
-    public void onException(final Throwable e);
+    void onException(final Throwable e);
 }
diff --git a/common/src/main/java/org/apache/rocketmq/common/MixAll.java b/common/src/main/java/org/apache/rocketmq/common/MixAll.java
index c2a915a767a6287083022c8a17aebdde234e6264..3a005e6a545b60c3d68b497ead4b641a92573a8e 100644
--- a/common/src/main/java/org/apache/rocketmq/common/MixAll.java
+++ b/common/src/main/java/org/apache/rocketmq/common/MixAll.java
@@ -16,20 +16,33 @@
  */
 package org.apache.rocketmq.common;
 
-import org.apache.rocketmq.common.annotation.ImportantField;
-import org.apache.rocketmq.common.constant.LoggerName;
-import org.apache.rocketmq.common.help.FAQUrl;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.io.*;
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStream;
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
-import java.net.*;
-import java.util.*;
+import java.net.Inet6Address;
+import java.net.InetAddress;
+import java.net.NetworkInterface;
+import java.net.SocketException;
+import java.net.URL;
+import java.net.URLConnection;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
 import java.util.concurrent.atomic.AtomicLong;
+import org.apache.rocketmq.common.annotation.ImportantField;
+import org.apache.rocketmq.common.constant.LoggerName;
+import org.apache.rocketmq.common.help.FAQUrl;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class MixAll {
     private static final Logger log = LoggerFactory.getLogger(LoggerName.COMMON_LOGGER_NAME);
diff --git a/remoting/src/main/java/org/apache/rocketmq/remoting/common/RemotingUtil.java b/remoting/src/main/java/org/apache/rocketmq/remoting/common/RemotingUtil.java
index 2fe8752f28a5cd955359d4fbfa1cb18702caef26..8d24e76b4f886cfc784a2f54832286d57cf05a53 100644
--- a/remoting/src/main/java/org/apache/rocketmq/remoting/common/RemotingUtil.java
+++ b/remoting/src/main/java/org/apache/rocketmq/remoting/common/RemotingUtil.java
@@ -19,17 +19,20 @@ package org.apache.rocketmq.remoting.common;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelFutureListener;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import java.io.IOException;
 import java.lang.reflect.Method;
-import java.net.*;
+import java.net.Inet6Address;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.NetworkInterface;
+import java.net.SocketAddress;
 import java.nio.channels.Selector;
 import java.nio.channels.SocketChannel;
 import java.nio.channels.spi.SelectorProvider;
 import java.util.ArrayList;
 import java.util.Enumeration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class RemotingUtil {
     public static final String OS_NAME = System.getProperty("os.name");
diff --git a/style/rmq_checkstyle.xml b/style/rmq_checkstyle.xml
index a6edb24a1dc7998332b448e0c952b00961696e7e..e93b353aaa18a00cbebd37784b52beb036fecc97 100644
--- a/style/rmq_checkstyle.xml
+++ b/style/rmq_checkstyle.xml
@@ -122,7 +122,7 @@
         <module name="StaticVariableName"/>
         <module name="TypeName"/>
         <!--Checks that there are no import statements that use the * notation-->
-        <!--<module name="AvoidStarImport"/>-->
+        <module name="AvoidStarImport"/>
 
         <!--whitespace-->
         <module name="GenericWhitespace"/>