diff --git a/api/src/main/java/com/alibaba/nacos/api/config/ConfigFactory.java b/api/src/main/java/com/alibaba/nacos/api/config/ConfigFactory.java
index 1e6e9a9db..a79d82cd6 100644
--- a/api/src/main/java/com/alibaba/nacos/api/config/ConfigFactory.java
+++ b/api/src/main/java/com/alibaba/nacos/api/config/ConfigFactory.java
@@ -49,21 +49,14 @@ public class ConfigFactory {
     /**
      * Create Config
      *
-     * @param ServerAddr serverlist
+     * @param serverAddr serverList
      * @return Config
      * @throws NacosException Exception
      */
     public static ConfigService createConfigService(String serverAddr) throws NacosException {
         Properties properties = new Properties();
         properties.put(PropertyKeyConst.SERVER_ADDR, serverAddr);
-        try {
-            Class<?> driverImplClass = Class.forName("com.alibaba.nacos.client.config.NacosConfigService");
-            Constructor constructor = driverImplClass.getConstructor(Properties.class);
-            ConfigService vendorImpl = (ConfigService)constructor.newInstance(properties);
-            return vendorImpl;
-        } catch (Throwable e) {
-            throw new NacosException(-400, e.getMessage());
-        }
+        return createConfigService(properties);
     }
 
 }
diff --git a/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigContext.java b/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigContext.java
index 8cbff0e8e..4b82cf43e 100644
--- a/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigContext.java
+++ b/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigContext.java
@@ -27,7 +27,7 @@ public interface IConfigContext {
      * @param key
      * @return context
      */
-    public Object getParameter(String key);
+    Object getParameter(String key);
 
     /**
      * set context
@@ -35,5 +35,5 @@ public interface IConfigContext {
      * @param key   key
      * @param value value
      */
-    public void setParameter(String key, Object value);
+    void setParameter(String key, Object value);
 }
diff --git a/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigFilter.java b/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigFilter.java
index c8ae51251..bdc8f02f2 100644
--- a/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigFilter.java
+++ b/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigFilter.java
@@ -24,7 +24,7 @@ import com.alibaba.nacos.api.exception.NacosException;
  */
 public interface IConfigFilter {
     /**
-     * Init Fuction
+     * Init Function
      *
      * @param filterConfig Filter Config
      */
diff --git a/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigFilterChain.java b/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigFilterChain.java
index 6c9ac180c..1ef90554f 100644
--- a/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigFilterChain.java
+++ b/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigFilterChain.java
@@ -24,12 +24,12 @@ import com.alibaba.nacos.api.exception.NacosException;
  */
 public interface IConfigFilterChain {
     /**
-     * Filter aciton
+     * Filter action
      *
      * @param request  request
      * @param response response
      * @throws NacosException NacosException
      */
-    public void doFilter(IConfigRequest request, IConfigResponse response) throws NacosException;
+    void doFilter(IConfigRequest request, IConfigResponse response) throws NacosException;
 
 }
diff --git a/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigRequest.java b/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigRequest.java
index 176ea2553..428c39d39 100644
--- a/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigRequest.java
+++ b/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigRequest.java
@@ -27,13 +27,13 @@ public interface IConfigRequest {
      * @param key key
      * @return value
      */
-    public Object getParameter(String key);
+    Object getParameter(String key);
 
     /**
      * get config context
      *
      * @return
      */
-    public IConfigContext getConfigContext();
+    IConfigContext getConfigContext();
 
 }
diff --git a/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigResponse.java b/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigResponse.java
index 9dc707fed..872ab3a50 100644
--- a/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigResponse.java
+++ b/api/src/main/java/com/alibaba/nacos/api/config/filter/IConfigResponse.java
@@ -27,13 +27,13 @@ public interface IConfigResponse {
      * @param key key
      * @return value
      */
-    public Object getParameter(String key);
+    Object getParameter(String key);
 
     /**
      * get context
      *
      * @return configContext
      */
-    public IConfigContext getConfigContext();
+    IConfigContext getConfigContext();
 
 }
diff --git a/api/src/main/java/com/alibaba/nacos/api/config/filter/IFilterConfig.java b/api/src/main/java/com/alibaba/nacos/api/config/filter/IFilterConfig.java
index a625710e2..c0bf63224 100644
--- a/api/src/main/java/com/alibaba/nacos/api/config/filter/IFilterConfig.java
+++ b/api/src/main/java/com/alibaba/nacos/api/config/filter/IFilterConfig.java
@@ -27,7 +27,7 @@ public interface IFilterConfig {
      *
      * @return
      */
-    public String getFilterName();
+    String getFilterName();
 
     /**
      * get param
@@ -35,6 +35,6 @@ public interface IFilterConfig {
      * @param name
      * @return param
      */
-    public Object getInitParameter(String name);
+    Object getInitParameter(String name);
 
 }
diff --git a/api/src/main/java/com/alibaba/nacos/api/config/listener/AbstractListener.java b/api/src/main/java/com/alibaba/nacos/api/config/listener/AbstractListener.java
index 645f6545c..251ec0a42 100644
--- a/api/src/main/java/com/alibaba/nacos/api/config/listener/AbstractListener.java
+++ b/api/src/main/java/com/alibaba/nacos/api/config/listener/AbstractListener.java
@@ -18,7 +18,7 @@ package com.alibaba.nacos.api.config.listener;
 import java.util.concurrent.Executor;
 
 /**
- * Listner Adapter,use default notify thread
+ * Listener Adapter,use default notify thread
  *
  * @author water.lyl
  */
@@ -28,6 +28,7 @@ public abstract class AbstractListener implements Listener {
     /**
      * use default Executor
      */
+    @Override
     public Executor getExecutor() {
         return null;
     }
diff --git a/api/src/main/java/com/alibaba/nacos/api/config/listener/Listener.java b/api/src/main/java/com/alibaba/nacos/api/config/listener/Listener.java
index 2a9fc5103..abaed12a7 100644
--- a/api/src/main/java/com/alibaba/nacos/api/config/listener/Listener.java
+++ b/api/src/main/java/com/alibaba/nacos/api/config/listener/Listener.java
@@ -25,16 +25,16 @@ import java.util.concurrent.Executor;
 public interface Listener {
 
     /**
-     * Executor to excute this receive
+     * Executor to execute this receive
      *
      * @return Executor
      */
-    public Executor getExecutor();
+    Executor getExecutor();
 
     /**
      * 接收配置信息
      *
      * @param configInfo 配置值
      */
-    public void receiveConfigInfo(final String configInfo);
+    void receiveConfigInfo(final String configInfo);
 }
diff --git a/example/src/main/java/com/alibaba/nacos/example/ConfigExample.java b/example/src/main/java/com/alibaba/nacos/example/ConfigExample.java
index d6ab57af1..bf628d370 100644
--- a/example/src/main/java/com/alibaba/nacos/example/ConfigExample.java
+++ b/example/src/main/java/com/alibaba/nacos/example/ConfigExample.java
@@ -42,7 +42,7 @@ public class ConfigExample {
         configService.addListener(dataId, group, new Listener() {
             @Override
             public void receiveConfigInfo(String configInfo) {
-                System.out.println("recieve:" + configInfo);
+                System.out.println("receive:" + configInfo);
             }
 
             @Override