diff --git a/core/src/main/java/com/taobao/arthas/core/command/basic1000/HelpCommand.java b/core/src/main/java/com/taobao/arthas/core/command/basic1000/HelpCommand.java
index 0b37d70ef..6e1d5f23e 100644
--- a/core/src/main/java/com/taobao/arthas/core/command/basic1000/HelpCommand.java
+++ b/core/src/main/java/com/taobao/arthas/core/command/basic1000/HelpCommand.java
@@ -1,6 +1,9 @@
 package com.taobao.arthas.core.command.basic1000;
 
-import com.taobao.arthas.core.command.model.*;
+import com.taobao.arthas.core.command.model.ArgumentVO;
+import com.taobao.arthas.core.command.model.CommandOptionVO;
+import com.taobao.arthas.core.command.model.CommandVO;
+import com.taobao.arthas.core.command.model.HelpModel;
 import com.taobao.arthas.core.shell.cli.Completion;
 import com.taobao.arthas.core.shell.cli.CompletionUtils;
 import com.taobao.arthas.core.shell.command.AnnotatedCommand;
diff --git a/core/src/main/java/com/taobao/arthas/core/distribution/ResultConsumerHelper.java b/core/src/main/java/com/taobao/arthas/core/distribution/ResultConsumerHelper.java
index d123f9673..e4724e582 100644
--- a/core/src/main/java/com/taobao/arthas/core/distribution/ResultConsumerHelper.java
+++ b/core/src/main/java/com/taobao/arthas/core/distribution/ResultConsumerHelper.java
@@ -1,13 +1,16 @@
 package com.taobao.arthas.core.distribution;
 
 import com.alibaba.fastjson.JSON;
-import com.taobao.arthas.core.command.model.*;
+import com.taobao.arthas.core.command.model.ResultModel;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.lang.reflect.Array;
 import java.lang.reflect.Field;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 /**
diff --git a/core/src/main/java/com/taobao/arthas/core/server/ArthasBootstrap.java b/core/src/main/java/com/taobao/arthas/core/server/ArthasBootstrap.java
index 27823c526..a5ec0afa1 100644
--- a/core/src/main/java/com/taobao/arthas/core/server/ArthasBootstrap.java
+++ b/core/src/main/java/com/taobao/arthas/core/server/ArthasBootstrap.java
@@ -242,14 +242,14 @@ public class ArthasBootstrap {
                 tunnelClient.setTunnelServerUrl(configure.getTunnelServer());
                 // ws://127.0.0.1:8563/ws
                 String host = "127.0.0.1";
-                if (configure.getIp() != null) {
+                if(configure.getIp() != null) {
                     host = configure.getIp();
                 }
                 URI uri = new URI("ws", null, host, configure.getHttpPort(), "/ws", null, null);
                 tunnelClient.setLocalServerUrl(uri.toString());
                 ChannelFuture channelFuture = tunnelClient.start();
                 channelFuture.await(10, TimeUnit.SECONDS);
-                if (channelFuture.isSuccess()) {
+                if(channelFuture.isSuccess()) {
                     agentId = tunnelClient.getId();
                 }
             }
@@ -259,9 +259,9 @@ public class ArthasBootstrap {
 
         try {
             ShellServerOptions options = new ShellServerOptions()
-                    .setInstrumentation(instrumentation)
-                    .setPid(PidUtils.currentLongPid())
-                    .setSessionTimeout(configure.getSessionTimeout() * 1000);
+                            .setInstrumentation(instrumentation)
+                            .setPid(PidUtils.currentLongPid())
+                            .setSessionTimeout(configure.getSessionTimeout() * 1000);
 
             if (agentId != null) {
                 Map<String, String> welcomeInfos = new HashMap<String, String>();
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/system/impl/JobControllerImpl.java b/core/src/main/java/com/taobao/arthas/core/shell/system/impl/JobControllerImpl.java
index fee1b1675..e21b3551d 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/system/impl/JobControllerImpl.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/system/impl/JobControllerImpl.java
@@ -19,11 +19,19 @@ import com.taobao.arthas.core.shell.term.Term;
 import com.taobao.arthas.core.util.Constants;
 import com.taobao.arthas.core.util.LogUtil;
 import com.taobao.arthas.core.util.TokenUtils;
+
 import io.termd.core.function.Function;
 
 import java.io.File;
 import java.io.IOException;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.ListIterator;
+import java.util.Set;
+import java.util.SortedMap;
+import java.util.TreeMap;
 import java.util.concurrent.atomic.AtomicInteger;
 
 /**
@@ -224,5 +232,4 @@ public class JobControllerImpl implements JobController {
     public void close() {
         close(null);
     }
-
 }