diff --git a/spring-cloud-alibaba-dependencies/pom.xml b/spring-cloud-alibaba-dependencies/pom.xml
index 69b9e5ff..85dadc24 100644
--- a/spring-cloud-alibaba-dependencies/pom.xml
+++ b/spring-cloud-alibaba-dependencies/pom.xml
@@ -19,7 +19,7 @@
     <properties>
         <sentinel.version>1.6.0</sentinel.version>
         <oss.version>3.1.0</oss.version>
-        <seata.version>0.5.0</seata.version>
+        <seata.version>0.5.1</seata.version>
         <nacos.client.version>1.0.0</nacos.client.version>
         <nacos.config.version>0.8.0</nacos.config.version>
         <acm.version>1.0.9</acm.version>
@@ -31,7 +31,7 @@
         <schedulerX.client.version>2.1.6</schedulerX.client.version>
         <dubbo.version>2.7.1</dubbo.version>
         <dubbo-spring-boot.version>2.7.1</dubbo-spring-boot.version>
-        <dubbo-registry-nacos.version>0.0.2</dubbo-registry-nacos.version>
+        <dubbo-registry-nacos.version>2.7.1</dubbo-registry-nacos.version>
         <aliyun.java.sdk.dysmsapi>1.1.0</aliyun.java.sdk.dysmsapi>
         <aliyun.sdk.mns>1.1.8.6</aliyun.sdk.mns>
         <aliyun.java.sdk.dyvmsapi>1.1.1</aliyun.java.sdk.dyvmsapi>
@@ -243,7 +243,7 @@
 
             <!-- Dubbo Nacos registry dependency -->
             <dependency>
-                <groupId>com.alibaba</groupId>
+                <groupId>org.apache.dubbo</groupId>
                 <artifactId>dubbo-registry-nacos</artifactId>
                 <version>${dubbo-registry-nacos.version}</version>
             </dependency>
diff --git a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/http/DefaultHttpRequest.java b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/http/DefaultHttpRequest.java
index 3f1f376d..60c21f00 100644
--- a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/http/DefaultHttpRequest.java
+++ b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/http/DefaultHttpRequest.java
@@ -60,6 +60,7 @@ public class DefaultHttpRequest implements HttpRequest {
         return HttpMethod.resolve(getMethodValue());
     }
 
+    @Override
     public String getMethodValue() {
         return method;
     }
diff --git a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/http/MutableHttpServerRequest.java b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/http/MutableHttpServerRequest.java
index 62240f3b..1ff65e42 100644
--- a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/http/MutableHttpServerRequest.java
+++ b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/http/MutableHttpServerRequest.java
@@ -73,6 +73,7 @@ public class MutableHttpServerRequest implements HttpServerRequest {
     }
 
     // Override method since Spring Framework 5.0
+    @Override
     public String getMethodValue() {
         return httpMethod.name();
     }
diff --git a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/DubboRestServiceMetadata.java b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/DubboRestServiceMetadata.java
index 5c5ef3ad..bb7b4aa1 100644
--- a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/DubboRestServiceMetadata.java
+++ b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/DubboRestServiceMetadata.java
@@ -44,8 +44,12 @@ public class DubboRestServiceMetadata {
 
     @Override
     public boolean equals(Object o) {
-        if (this == o) return true;
-        if (!(o instanceof DubboRestServiceMetadata)) return false;
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof DubboRestServiceMetadata)) {
+            return false;
+        }
         DubboRestServiceMetadata that = (DubboRestServiceMetadata) o;
         return Objects.equals(serviceRestMetadata, that.serviceRestMetadata) &&
                 Objects.equals(restMethodMetadata, that.restMethodMetadata);
diff --git a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/DubboTransportedMethodMetadata.java b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/DubboTransportedMethodMetadata.java
index 6e7ab9ac..edb27b4c 100644
--- a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/DubboTransportedMethodMetadata.java
+++ b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/DubboTransportedMethodMetadata.java
@@ -77,8 +77,12 @@ public class DubboTransportedMethodMetadata {
 
     @Override
     public boolean equals(Object o) {
-        if (this == o) return true;
-        if (!(o instanceof DubboTransportedMethodMetadata)) return false;
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof DubboTransportedMethodMetadata)) {
+            return false;
+        }
         DubboTransportedMethodMetadata that = (DubboTransportedMethodMetadata) o;
         return Objects.equals(methodMetadata, that.methodMetadata) &&
                 Objects.equals(attributes, that.attributes);
diff --git a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/MethodMetadata.java b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/MethodMetadata.java
index 9dfe6ea4..3a6da5b8 100644
--- a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/MethodMetadata.java
+++ b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/MethodMetadata.java
@@ -110,8 +110,12 @@ public class MethodMetadata {
 
     @Override
     public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
         MethodMetadata that = (MethodMetadata) o;
         return Objects.equals(name, that.name) &&
                 Objects.equals(returnType, that.returnType) &&
diff --git a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/MethodParameterMetadata.java b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/MethodParameterMetadata.java
index 0abf2b0e..1c3aaa26 100644
--- a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/MethodParameterMetadata.java
+++ b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/MethodParameterMetadata.java
@@ -61,8 +61,12 @@ public class MethodParameterMetadata {
 
     @Override
     public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
         MethodParameterMetadata that = (MethodParameterMetadata) o;
         return index == that.index &&
                 Objects.equals(name, that.name) &&
diff --git a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/RequestMetadata.java b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/RequestMetadata.java
index 29361b93..caa5e8d1 100644
--- a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/RequestMetadata.java
+++ b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/RequestMetadata.java
@@ -235,8 +235,12 @@ public class RequestMetadata {
 
     @Override
     public boolean equals(Object o) {
-        if (this == o) return true;
-        if (!(o instanceof RequestMetadata)) return false;
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof RequestMetadata)) {
+            return false;
+        }
         RequestMetadata that = (RequestMetadata) o;
         return Objects.equals(method, that.method) &&
                 Objects.equals(path, that.path) &&
diff --git a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/RestMethodMetadata.java b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/RestMethodMetadata.java
index edbcf46a..b3055357 100644
--- a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/RestMethodMetadata.java
+++ b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/RestMethodMetadata.java
@@ -183,8 +183,12 @@ public class RestMethodMetadata {
 
     @Override
     public boolean equals(Object o) {
-        if (this == o) return true;
-        if (!(o instanceof RestMethodMetadata)) return false;
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof RestMethodMetadata)) {
+            return false;
+        }
         RestMethodMetadata that = (RestMethodMetadata) o;
         return queryMapEncoded == that.queryMapEncoded &&
                 Objects.equals(method, that.method) &&
diff --git a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/ServiceRestMetadata.java b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/ServiceRestMetadata.java
index 14cc3ac6..18850588 100644
--- a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/ServiceRestMetadata.java
+++ b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/metadata/ServiceRestMetadata.java
@@ -52,8 +52,12 @@ public class ServiceRestMetadata {
 
     @Override
     public boolean equals(Object o) {
-        if (this == o) return true;
-        if (!(o instanceof ServiceRestMetadata)) return false;
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof ServiceRestMetadata)) {
+            return false;
+        }
         ServiceRestMetadata that = (ServiceRestMetadata) o;
         return Objects.equals(url, that.url) &&
                 Objects.equals(meta, that.meta);
diff --git a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/registry/AbstractSpringCloudRegistry.java b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/registry/AbstractSpringCloudRegistry.java
index b60c8247..7155ab65 100644
--- a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/registry/AbstractSpringCloudRegistry.java
+++ b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/registry/AbstractSpringCloudRegistry.java
@@ -64,7 +64,7 @@ public abstract class AbstractSpringCloudRegistry extends FailbackRegistry {
 
     protected static final String DUBBO_METADATA_SERVICE_CLASS_NAME = DubboMetadataService.class.getName();
 
-    private static final Set<String> schedulerTasks = new HashSet<>();
+    private static final Set<String> SCHEDULER_TASKS = new HashSet<>();
 
     protected final Logger logger = LoggerFactory.getLogger(getClass());
 
@@ -164,7 +164,7 @@ public abstract class AbstractSpringCloudRegistry extends FailbackRegistry {
 
     private void submitSchedulerTaskIfAbsent(URL url, NotifyListener listener) {
         String taskId = url.toIdentityString();
-        if (schedulerTasks.add(taskId)) {
+        if (SCHEDULER_TASKS.add(taskId)) {
             schedule(() -> doSubscribeDubboServiceURLs(url, listener));
         }
     }
diff --git a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/service/DubboGenericServiceFactory.java b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/service/DubboGenericServiceFactory.java
index 4cfa3a22..2955df1b 100644
--- a/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/service/DubboGenericServiceFactory.java
+++ b/spring-cloud-alibaba-dubbo/src/main/java/org/springframework/cloud/alibaba/dubbo/service/DubboGenericServiceFactory.java
@@ -110,6 +110,7 @@ public class DubboGenericServiceFactory {
         dataBinder.registerCustomEditor(String.class, "listener", new StringTrimmerEditor(true));
         dataBinder.registerCustomEditor(Map.class, "parameters", new PropertyEditorSupport() {
 
+            @Override
             public void setAsText(String text) throws java.lang.IllegalArgumentException {
                 // Trim all whitespace
                 String content = StringUtils.trimAllWhitespace(text);
diff --git a/spring-cloud-alibaba-examples/seata-example/business-service/src/main/resources/file.conf b/spring-cloud-alibaba-examples/seata-example/business-service/src/main/resources/file.conf
index 39beec98..cb1ab8bb 100644
--- a/spring-cloud-alibaba-examples/seata-example/business-service/src/main/resources/file.conf
+++ b/spring-cloud-alibaba-examples/seata-example/business-service/src/main/resources/file.conf
@@ -20,15 +20,35 @@ transport {
     worker-thread-size = 8
   }
 }
+## transaction log store
 store {
-  # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
-  max-branch-session-size = 16384
-  # globe session size , if exceeded throws exceptions
-  max-global-session-size = 512
-  # file buffer size , if exceeded allocate new buffer
-  file-write-buffer-cache-size = 16384
-  # when recover batch read size
-  session.reload.read_size = 100
+  ## store mode: file、db
+  mode = "file"
+
+  ## file store
+  file {
+    dir = "sessionStore"
+
+    # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
+    max-branch-session-size = 16384
+    # globe session size , if exceeded throws exceptions
+    max-global-session-size = 512
+    # file buffer size , if exceeded allocate new buffer
+    file-write-buffer-cache-size = 16384
+    # when recover batch read size
+    session.reload.read_size = 100
+    # async, sync
+    flush-disk-mode = async
+  }
+
+  ## database store
+  db {
+    driver_class = ""
+    url = ""
+    user = ""
+    password = ""
+  }
+
 }
 service {
   #vgroup->rgroup
diff --git a/spring-cloud-alibaba-examples/seata-example/business-service/src/main/resources/registry.conf b/spring-cloud-alibaba-examples/seata-example/business-service/src/main/resources/registry.conf
index 31bcace5..7d71afaa 100644
--- a/spring-cloud-alibaba-examples/seata-example/business-service/src/main/resources/registry.conf
+++ b/spring-cloud-alibaba-examples/seata-example/business-service/src/main/resources/registry.conf
@@ -1,5 +1,5 @@
 registry {
-  # file 、nacos 、eureka、redis、zk、consul
+  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
   type = "file"
 
   nacos {
@@ -26,6 +26,19 @@ registry {
     cluster = "default"
     serverAddr = "127.0.0.1:8500"
   }
+  etcd3 {
+    cluster = "default"
+    serverAddr = "http://localhost:2379"
+  }
+  sofa {
+    serverAddr = "127.0.0.1:9603"
+    application = "default"
+    region = "DEFAULT_ZONE"
+    datacenter = "DefaultDataCenter"
+    cluster = "default"
+    group = "SEATA_GROUP"
+    addressWaitTime = "3000"
+  }
   file {
     name = "file.conf"
   }
@@ -41,7 +54,7 @@ config {
     cluster = "default"
   }
   apollo {
-    app.id = "fescar-server"
+    app.id = "seata-server"
     apollo.meta = "http://192.168.1.204:8801"
   }
   zk {
@@ -52,4 +65,4 @@ config {
   file {
     name = "file.conf"
   }
-}
+}
\ No newline at end of file
diff --git a/spring-cloud-alibaba-examples/seata-example/order-service/src/main/resources/file.conf b/spring-cloud-alibaba-examples/seata-example/order-service/src/main/resources/file.conf
index 2ef4f39a..7213edea 100644
--- a/spring-cloud-alibaba-examples/seata-example/order-service/src/main/resources/file.conf
+++ b/spring-cloud-alibaba-examples/seata-example/order-service/src/main/resources/file.conf
@@ -20,15 +20,35 @@ transport {
     worker-thread-size = 8
   }
 }
+## transaction log store
 store {
-  # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
-  max-branch-session-size = 16384
-  # globe session size , if exceeded throws exceptions
-  max-global-session-size = 512
-  # file buffer size , if exceeded allocate new buffer
-  file-write-buffer-cache-size = 16384
-  # when recover batch read size
-  session.reload.read_size = 100
+  ## store mode: file、db
+  mode = "file"
+
+  ## file store
+  file {
+    dir = "sessionStore"
+
+    # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
+    max-branch-session-size = 16384
+    # globe session size , if exceeded throws exceptions
+    max-global-session-size = 512
+    # file buffer size , if exceeded allocate new buffer
+    file-write-buffer-cache-size = 16384
+    # when recover batch read size
+    session.reload.read_size = 100
+    # async, sync
+    flush-disk-mode = async
+  }
+
+  ## database store
+  db {
+    driver_class = ""
+    url = ""
+    user = ""
+    password = ""
+  }
+
 }
 service {
   #vgroup->rgroup
diff --git a/spring-cloud-alibaba-examples/seata-example/order-service/src/main/resources/registry.conf b/spring-cloud-alibaba-examples/seata-example/order-service/src/main/resources/registry.conf
index 31bcace5..7d71afaa 100644
--- a/spring-cloud-alibaba-examples/seata-example/order-service/src/main/resources/registry.conf
+++ b/spring-cloud-alibaba-examples/seata-example/order-service/src/main/resources/registry.conf
@@ -1,5 +1,5 @@
 registry {
-  # file 、nacos 、eureka、redis、zk、consul
+  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
   type = "file"
 
   nacos {
@@ -26,6 +26,19 @@ registry {
     cluster = "default"
     serverAddr = "127.0.0.1:8500"
   }
+  etcd3 {
+    cluster = "default"
+    serverAddr = "http://localhost:2379"
+  }
+  sofa {
+    serverAddr = "127.0.0.1:9603"
+    application = "default"
+    region = "DEFAULT_ZONE"
+    datacenter = "DefaultDataCenter"
+    cluster = "default"
+    group = "SEATA_GROUP"
+    addressWaitTime = "3000"
+  }
   file {
     name = "file.conf"
   }
@@ -41,7 +54,7 @@ config {
     cluster = "default"
   }
   apollo {
-    app.id = "fescar-server"
+    app.id = "seata-server"
     apollo.meta = "http://192.168.1.204:8801"
   }
   zk {
@@ -52,4 +65,4 @@ config {
   file {
     name = "file.conf"
   }
-}
+}
\ No newline at end of file
diff --git a/spring-cloud-alibaba-examples/seata-example/readme-zh.md b/spring-cloud-alibaba-examples/seata-example/readme-zh.md
index 239099a3..9c12eb50 100644
--- a/spring-cloud-alibaba-examples/seata-example/readme-zh.md
+++ b/spring-cloud-alibaba-examples/seata-example/readme-zh.md
@@ -101,7 +101,7 @@ CREATE TABLE `account_tbl` (
 进入解压之后的 bin 目录，执行如下命令来启动
 
 ```$shell
-sh seata-server.sh $LISTEN_PORT $MODE
+sh seata-server.sh $LISTEN_PORT $MODE(file or db)
 ```
 
 在这个示例中，采用如下命令来启动 Seata Server
@@ -110,7 +110,7 @@ sh seata-server.sh $LISTEN_PORT $MODE
 sh seata-server.sh 8091 file
 ```
 
-**注意** 如果你修改了endpoint且注册中心使用默认file类型，那么记得需要在各个示例工程中的 `file.conf` 文件中，修改 grouplist 的值。
+**注意** 如果你修改了endpoint且注册中心使用默认file类型，那么记得需要在各个示例工程中的 `file.conf` 文件中，修改 grouplist 的值(当registry.conf 中registry.type 或 config.type 为file 时会读取内部的file节点中的文件名，若type不为file将直接从配置类型的对应元数据的注册配置中心读取数据)，推荐大家使用 nacos 作为配置注册中心。
 
 
 ## 运行示例
diff --git a/spring-cloud-alibaba-examples/seata-example/storage-service/src/main/resources/file.conf b/spring-cloud-alibaba-examples/seata-example/storage-service/src/main/resources/file.conf
index 6c1bebbb..4699d684 100644
--- a/spring-cloud-alibaba-examples/seata-example/storage-service/src/main/resources/file.conf
+++ b/spring-cloud-alibaba-examples/seata-example/storage-service/src/main/resources/file.conf
@@ -20,15 +20,35 @@ transport {
     worker-thread-size = 8
   }
 }
+## transaction log store
 store {
-  # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
-  max-branch-session-size = 16384
-  # globe session size , if exceeded throws exceptions
-  max-global-session-size = 512
-  # file buffer size , if exceeded allocate new buffer
-  file-write-buffer-cache-size = 16384
-  # when recover batch read size
-  session.reload.read_size = 100
+  ## store mode: file、db
+  mode = "file"
+
+  ## file store
+  file {
+    dir = "sessionStore"
+
+    # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
+    max-branch-session-size = 16384
+    # globe session size , if exceeded throws exceptions
+    max-global-session-size = 512
+    # file buffer size , if exceeded allocate new buffer
+    file-write-buffer-cache-size = 16384
+    # when recover batch read size
+    session.reload.read_size = 100
+    # async, sync
+    flush-disk-mode = async
+  }
+
+  ## database store
+  db {
+    driver_class = ""
+    url = ""
+    user = ""
+    password = ""
+  }
+
 }
 service {
   #vgroup->rgroup
diff --git a/spring-cloud-alibaba-examples/seata-example/storage-service/src/main/resources/registry.conf b/spring-cloud-alibaba-examples/seata-example/storage-service/src/main/resources/registry.conf
index 31bcace5..7d71afaa 100644
--- a/spring-cloud-alibaba-examples/seata-example/storage-service/src/main/resources/registry.conf
+++ b/spring-cloud-alibaba-examples/seata-example/storage-service/src/main/resources/registry.conf
@@ -1,5 +1,5 @@
 registry {
-  # file 、nacos 、eureka、redis、zk、consul
+  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
   type = "file"
 
   nacos {
@@ -26,6 +26,19 @@ registry {
     cluster = "default"
     serverAddr = "127.0.0.1:8500"
   }
+  etcd3 {
+    cluster = "default"
+    serverAddr = "http://localhost:2379"
+  }
+  sofa {
+    serverAddr = "127.0.0.1:9603"
+    application = "default"
+    region = "DEFAULT_ZONE"
+    datacenter = "DefaultDataCenter"
+    cluster = "default"
+    group = "SEATA_GROUP"
+    addressWaitTime = "3000"
+  }
   file {
     name = "file.conf"
   }
@@ -41,7 +54,7 @@ config {
     cluster = "default"
   }
   apollo {
-    app.id = "fescar-server"
+    app.id = "seata-server"
     apollo.meta = "http://192.168.1.204:8801"
   }
   zk {
@@ -52,4 +65,4 @@ config {
   file {
     name = "file.conf"
   }
-}
+}
\ No newline at end of file
diff --git a/spring-cloud-alibaba-examples/spring-cloud-alibaba-dubbo-examples/spring-cloud-dubbo-servlet-gateway-sample/src/main/java/org/springframework/cloud/alibaba/dubbo/gateway/DubboGatewayServlet.java b/spring-cloud-alibaba-examples/spring-cloud-alibaba-dubbo-examples/spring-cloud-dubbo-servlet-gateway-sample/src/main/java/org/springframework/cloud/alibaba/dubbo/gateway/DubboGatewayServlet.java
index b3c56d24..21eab7e3 100644
--- a/spring-cloud-alibaba-examples/spring-cloud-alibaba-dubbo-examples/spring-cloud-dubbo-servlet-gateway-sample/src/main/java/org/springframework/cloud/alibaba/dubbo/gateway/DubboGatewayServlet.java
+++ b/spring-cloud-alibaba-examples/spring-cloud-alibaba-dubbo-examples/spring-cloud-dubbo-servlet-gateway-sample/src/main/java/org/springframework/cloud/alibaba/dubbo/gateway/DubboGatewayServlet.java
@@ -76,6 +76,7 @@ public class DubboGatewayServlet extends HttpServletBean {
         return serviceName;
     }
 
+    @Override
     public void service(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
 
         String serviceName = resolveServiceName(request);
diff --git a/spring-cloud-alibaba-nacos-config/src/main/java/org/springframework/cloud/alibaba/nacos/NacosPropertySourceRepository.java b/spring-cloud-alibaba-nacos-config/src/main/java/org/springframework/cloud/alibaba/nacos/NacosPropertySourceRepository.java
index 0a0cc00c..6fa8e490 100644
--- a/spring-cloud-alibaba-nacos-config/src/main/java/org/springframework/cloud/alibaba/nacos/NacosPropertySourceRepository.java
+++ b/spring-cloud-alibaba-nacos-config/src/main/java/org/springframework/cloud/alibaba/nacos/NacosPropertySourceRepository.java
@@ -28,25 +28,25 @@ import java.util.concurrent.ConcurrentHashMap;
  */
 public class NacosPropertySourceRepository {
 
-	private final static ConcurrentHashMap<String, NacosPropertySource> nacosPropertySourceRepository = new ConcurrentHashMap<>();
+	private final static ConcurrentHashMap<String, NacosPropertySource> NACOS_PROPERTY_SOURCE_REPOSITORY = new ConcurrentHashMap<>();
 
 	/**
 	 * @return all nacos properties from application context
 	 */
 	public static List<NacosPropertySource> getAll() {
 		List<NacosPropertySource> result = new ArrayList<>();
-		result.addAll(nacosPropertySourceRepository.values());
+		result.addAll(NACOS_PROPERTY_SOURCE_REPOSITORY.values());
 		return result;
 	}
 
 	public static void collectNacosPropertySources(
 			NacosPropertySource nacosPropertySource) {
-		nacosPropertySourceRepository.putIfAbsent(nacosPropertySource.getDataId(),
+		NACOS_PROPERTY_SOURCE_REPOSITORY.putIfAbsent(nacosPropertySource.getDataId(),
 				nacosPropertySource);
 	}
 
 	public static NacosPropertySource getNacosPropertySource(String dataId) {
 
-		return nacosPropertySourceRepository.get(dataId);
+		return NACOS_PROPERTY_SOURCE_REPOSITORY.get(dataId);
 	}
 }
diff --git a/spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/discovery/NacosWatch.java b/spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/discovery/NacosWatch.java
index 0eefaf1a..861dc400 100644
--- a/spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/discovery/NacosWatch.java
+++ b/spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/discovery/NacosWatch.java
@@ -118,57 +118,10 @@ public class NacosWatch implements ApplicationEventPublisherAware, SmartLifecycl
 	}
 
 	public void nacosServicesWatch() {
-		try {
 
-			boolean changed = false;
-			NamingService namingService = properties.namingServiceInstance();
+		// nacos doesn't support watch now , publish an event every 30 seconds.
+		this.publisher.publishEvent(
+				new HeartbeatEvent(this, nacosWatchIndex.getAndIncrement()));
 
-			ListView<String> listView = properties.namingServiceInstance()
-					.getServicesOfServer(1, Integer.MAX_VALUE);
-
-			List<String> serviceList = listView.getData();
-
-			// if there are new services found, publish event
-			Set<String> currentServices = new HashSet<>(serviceList);
-			currentServices.removeAll(cacheServices);
-			if (currentServices.size() > 0) {
-				changed = true;
-			}
-
-			// if some services disappear, publish event
-			if (cacheServices.removeAll(new HashSet<>(serviceList))
-					&& cacheServices.size() > 0) {
-				changed = true;
-
-				for (String serviceName : cacheServices) {
-					namingService.unsubscribe(serviceName,
-							subscribeListeners.get(serviceName));
-					subscribeListeners.remove(serviceName);
-				}
-			}
-
-			cacheServices = new HashSet<>(serviceList);
-
-			// subscribe services's node change, publish event if nodes changed
-			for (String serviceName : cacheServices) {
-				if (!subscribeListeners.containsKey(serviceName)) {
-					EventListener eventListener = event -> NacosWatch.this.publisher
-							.publishEvent(new HeartbeatEvent(NacosWatch.this,
-									nacosWatchIndex.getAndIncrement()));
-					subscribeListeners.put(serviceName, eventListener);
-					namingService.subscribe(serviceName, eventListener);
-
-				}
-			}
-
-			if (changed) {
-				this.publisher.publishEvent(
-						new HeartbeatEvent(this, nacosWatchIndex.getAndIncrement()));
-			}
-
-		}
-		catch (Exception e) {
-			log.error("Error watching Nacos Service change", e);
-		}
 	}
 }
diff --git a/spring-cloud-alibaba-sentinel/src/main/java/org/springframework/cloud/alibaba/sentinel/feign/SentinelContractHolder.java b/spring-cloud-alibaba-sentinel/src/main/java/org/springframework/cloud/alibaba/sentinel/feign/SentinelContractHolder.java
index 6056e800..e1a43d2e 100644
--- a/spring-cloud-alibaba-sentinel/src/main/java/org/springframework/cloud/alibaba/sentinel/feign/SentinelContractHolder.java
+++ b/spring-cloud-alibaba-sentinel/src/main/java/org/springframework/cloud/alibaba/sentinel/feign/SentinelContractHolder.java
@@ -25,7 +25,7 @@ import feign.MethodMetadata;
 
 /**
  *
- * Using static field {@link SentinelContractHolder#metadataMap} to hold
+ * Using static field {@link SentinelContractHolder#METADATA_MAP} to hold
  * {@link MethodMetadata} data
  *
  * @author <a href="mailto:fangjian0423@gmail.com">Jim</a>
@@ -38,7 +38,7 @@ public class SentinelContractHolder implements Contract {
 	 * map key is constructed by ClassFullName + configKey. configKey is constructed by
 	 * {@link feign.Feign#configKey}
 	 */
-	public final static Map<String, MethodMetadata> metadataMap = new HashMap();
+	public final static Map<String, MethodMetadata> METADATA_MAP = new HashMap<>();
 
 	public SentinelContractHolder(Contract delegate) {
 		this.delegate = delegate;
@@ -47,7 +47,7 @@ public class SentinelContractHolder implements Contract {
 	@Override
 	public List<MethodMetadata> parseAndValidatateMetadata(Class<?> targetType) {
 		List<MethodMetadata> metadatas = delegate.parseAndValidatateMetadata(targetType);
-		metadatas.forEach(metadata -> metadataMap
+		metadatas.forEach(metadata -> METADATA_MAP
 				.put(targetType.getName() + metadata.configKey(), metadata));
 		return metadatas;
 	}
diff --git a/spring-cloud-alibaba-sentinel/src/main/java/org/springframework/cloud/alibaba/sentinel/feign/SentinelInvocationHandler.java b/spring-cloud-alibaba-sentinel/src/main/java/org/springframework/cloud/alibaba/sentinel/feign/SentinelInvocationHandler.java
index eda5ef5d..7e7614e8 100644
--- a/spring-cloud-alibaba-sentinel/src/main/java/org/springframework/cloud/alibaba/sentinel/feign/SentinelInvocationHandler.java
+++ b/spring-cloud-alibaba-sentinel/src/main/java/org/springframework/cloud/alibaba/sentinel/feign/SentinelInvocationHandler.java
@@ -90,7 +90,7 @@ public class SentinelInvocationHandler implements InvocationHandler {
 		// only handle by HardCodedTarget
 		if (target instanceof Target.HardCodedTarget) {
 			Target.HardCodedTarget hardCodedTarget = (Target.HardCodedTarget) target;
-			MethodMetadata methodMetadata = SentinelContractHolder.metadataMap
+			MethodMetadata methodMetadata = SentinelContractHolder.METADATA_MAP
 					.get(hardCodedTarget.type().getName()
 							+ Feign.configKey(hardCodedTarget.type(), method));
 			// resource default is HttpMethod:protocol://url
diff --git a/spring-cloud-alicloud-context/src/main/java/org/springframework/cloud/alicloud/context/sms/SmsProperties.java b/spring-cloud-alicloud-context/src/main/java/org/springframework/cloud/alicloud/context/sms/SmsProperties.java
index 33577863..11ba8cb7 100644
--- a/spring-cloud-alicloud-context/src/main/java/org/springframework/cloud/alicloud/context/sms/SmsProperties.java
+++ b/spring-cloud-alicloud-context/src/main/java/org/springframework/cloud/alicloud/context/sms/SmsProperties.java
@@ -12,12 +12,12 @@ public class SmsProperties {
 	/**
 	 * Product name.
 	 */
-	public static final String smsProduct = "Dysmsapi";
+	public static final String SMS_PRODUCT = "Dysmsapi";
 
 	/**
 	 * Product domain.
 	 */
-	public static final String smsDomain = "dysmsapi.aliyuncs.com";
+	public static final String SMS_DOMAIN = "dysmsapi.aliyuncs.com";
 
 	/**
 	 * Report queue name.
diff --git a/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/SmsInitializerEventListener.java b/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/SmsInitializerEventListener.java
index 78253878..4133d498 100644
--- a/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/SmsInitializerEventListener.java
+++ b/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/SmsInitializerEventListener.java
@@ -60,7 +60,7 @@ public class SmsInitializerEventListener
 		// 初始化acsClient,暂不支持region化
 		try {
 			DefaultProfile.addEndpoint("cn-hangzhou", "cn-hangzhou",
-					SmsProperties.smsProduct, SmsProperties.smsDomain);
+					SmsProperties.SMS_PRODUCT, SmsProperties.SMS_DOMAIN);
 			Collection<MessageListener> messageListeners = event.getApplicationContext()
 					.getBeansOfType(MessageListener.class).values();
 			if (messageListeners.isEmpty()) {
diff --git a/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/DefaultAlicomMessagePuller.java b/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/DefaultAlicomMessagePuller.java
index df03a071..4d23ccff 100755
--- a/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/DefaultAlicomMessagePuller.java
+++ b/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/DefaultAlicomMessagePuller.java
@@ -85,8 +85,8 @@ public class DefaultAlicomMessagePuller {
 		this.executorService = executorService;
 	}
 
-	protected static final Map<String, Object> sLockObjMap = new HashMap<String, Object>();
-	protected static Map<String, Boolean> sPollingMap = new ConcurrentHashMap<String, Boolean>();
+	protected static final Map<String, Object> S_LOCK_OBJ_MAP = new HashMap<>();
+	protected static Map<String, Boolean> sPollingMap = new ConcurrentHashMap<>();
 	protected Object lockObj;
 
 	public boolean setPolling(String queueName) {
@@ -309,11 +309,11 @@ public class DefaultAlicomMessagePuller {
 		task.messageType = messageType;
 		task.queueName = queueName;
 
-		synchronized (sLockObjMap) {
-			lockObj = sLockObjMap.get(queueName);
+		synchronized (S_LOCK_OBJ_MAP) {
+			lockObj = S_LOCK_OBJ_MAP.get(queueName);
 			if (lockObj == null) {
 				lockObj = new Object();
-				sLockObjMap.put(queueName, lockObj);
+				S_LOCK_OBJ_MAP.put(queueName, lockObj);
 			}
 		}
 
@@ -355,11 +355,11 @@ public class DefaultAlicomMessagePuller {
 		task.messageType = messageType;
 		task.queueName = queueName;
 
-		synchronized (sLockObjMap) {
-			lockObj = sLockObjMap.get(queueName);
+		synchronized (S_LOCK_OBJ_MAP) {
+			lockObj = S_LOCK_OBJ_MAP.get(queueName);
 			if (lockObj == null) {
 				lockObj = new Object();
-				sLockObjMap.put(queueName, lockObj);
+				S_LOCK_OBJ_MAP.put(queueName, lockObj);
 			}
 		}
 
@@ -402,11 +402,11 @@ public class DefaultAlicomMessagePuller {
 		task.messageType = messageType;
 		task.queueName = queueName;
 
-		synchronized (sLockObjMap) {
-			lockObj = sLockObjMap.get(queueName);
+		synchronized (S_LOCK_OBJ_MAP) {
+			lockObj = S_LOCK_OBJ_MAP.get(queueName);
 			if (lockObj == null) {
 				lockObj = new Object();
-				sLockObjMap.put(queueName, lockObj);
+				S_LOCK_OBJ_MAP.put(queueName, lockObj);
 			}
 		}
 
diff --git a/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/QueryTokenForMnsQueueRequest.java b/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/QueryTokenForMnsQueueRequest.java
index 956ecadb..1de389ca 100644
--- a/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/QueryTokenForMnsQueueRequest.java
+++ b/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/QueryTokenForMnsQueueRequest.java
@@ -76,6 +76,7 @@ public class QueryTokenForMnsQueueRequest
 
 	}
 
+	@Override
 	public Class<QueryTokenForMnsQueueResponse> getResponseClass() {
 		return QueryTokenForMnsQueueResponse.class;
 	}
diff --git a/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/QueryTokenForMnsQueueResponse.java b/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/QueryTokenForMnsQueueResponse.java
index 56c40171..5e296ed6 100644
--- a/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/QueryTokenForMnsQueueResponse.java
+++ b/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/QueryTokenForMnsQueueResponse.java
@@ -60,6 +60,7 @@ public class QueryTokenForMnsQueueResponse extends AcsResponse {
 		this.messageTokenDTO = messageTokenDTO;
 	}
 
+	@Override
 	public QueryTokenForMnsQueueResponse getInstance(UnmarshallerContext context) {
 		return QueryTokenForMnsQueueResponseUnmarshaller.unmarshall(this, context);
 	}
diff --git a/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/TokenGetterForAlicom.java b/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/TokenGetterForAlicom.java
index e312ec36..3daf1c83 100755
--- a/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/TokenGetterForAlicom.java
+++ b/spring-cloud-alicloud-sms/src/main/java/org/springframework/cloud/alicloud/sms/base/TokenGetterForAlicom.java
@@ -50,7 +50,7 @@ public class TokenGetterForAlicom {
 	private String domainForPop;
 	private IAcsClient iAcsClient;
 	private Long ownerId;
-	private final static String productName = "Dybaseapi";
+	private final static String PRODUCT_NAME = "Dybaseapi";
 	private long bufferTime = 1000 * 60 * 2;// 过期时间小于2分钟则重新获取，防止服务器时间误差
 	private final Object lock = new Object();
 	private ConcurrentMap<String, TokenForAlicom> tokenMap = new ConcurrentHashMap<String, TokenForAlicom>();
@@ -68,7 +68,7 @@ public class TokenGetterForAlicom {
 	}
 
 	private void init() throws ClientException {
-		DefaultProfile.addEndpoint(endpointNameForPop, regionIdForPop, productName,
+		DefaultProfile.addEndpoint(endpointNameForPop, regionIdForPop, PRODUCT_NAME,
 				domainForPop);
 		IClientProfile profile = DefaultProfile.getProfile(regionIdForPop, accessKeyId,
 				accessKeySecret);