diff --git a/sofarpc-sample/pom.xml b/sofarpc-sample/pom.xml
index 9efb390..5a68b29 100644
--- a/sofarpc-sample/pom.xml
+++ b/sofarpc-sample/pom.xml
@@ -10,6 +10,18 @@
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>sofarpc-sample</artifactId>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
 
 
 </project>
\ No newline at end of file
diff --git a/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnnotationClientImpl.java b/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnnotationClientImpl.java
index b6973f7..a84bed4 100644
--- a/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnnotationClientImpl.java
+++ b/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnnotationClientImpl.java
@@ -18,21 +18,19 @@
 
 import com.alipay.sofa.runtime.api.annotation.SofaReference;
 import com.alipay.sofa.runtime.api.annotation.SofaReferenceBinding;
-import org.springframework.stereotype.Component;
+import org.springframework.stereotype.Service;
 
 /**
  * @author <a href="mailto:leizhiyuan@gmail.com">leizhiyuan</a>
  */
-@Component
+@Service
 public class AnnotationClientImpl {
 
-    @SofaReference(interfaceType = AnnotationService.class, jvmFirst = false, binding = @SofaReferenceBinding(bindingType = "bolt"))
+    @SofaReference(interfaceType = AnnotationService.class, jvmFirst = false,
+            binding = @SofaReferenceBinding(bindingType = "bolt"))
     private AnnotationService annotationService;
 
     public String sayClientAnnotation(String str) {
-
-        String result = annotationService.sayAnnotation(str);
-
-        return result;
+        return annotationService.sayAnnotation(str);
     }
 }
\ No newline at end of file
diff --git a/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnnotationService.java b/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnnotationService.java
index 7ed5061..983e8c9 100644
--- a/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnnotationService.java
+++ b/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnnotationService.java
@@ -22,6 +22,6 @@
  */
 public interface AnnotationService {
 
-    String sayAnnotation(String stirng);
+    String sayAnnotation(String string);
 
 }
\ No newline at end of file
diff --git a/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnnotationServiceImpl.java b/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnnotationServiceImpl.java
index d82ab22..317cdaa 100644
--- a/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnnotationServiceImpl.java
+++ b/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnnotationServiceImpl.java
@@ -18,16 +18,16 @@
 
 import com.alipay.sofa.runtime.api.annotation.SofaService;
 import com.alipay.sofa.runtime.api.annotation.SofaServiceBinding;
-import org.springframework.stereotype.Component;
+import org.springframework.stereotype.Service;
 
 /**
  * @author <a href="mailto:leizhiyuan@gmail.com">leizhiyuan</a>
  */
 @SofaService(interfaceType = AnnotationService.class, bindings = { @SofaServiceBinding(bindingType = "bolt") })
-@Component
+@Service
 public class AnnotationServiceImpl implements AnnotationService {
     @Override
-    public String sayAnnotation(String stirng) {
-        return stirng;
+    public String sayAnnotation(String string) {
+        return string;
     }
 }
\ No newline at end of file
diff --git a/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnotationClientApplication.java b/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnotationClientApplication.java
index 6fbd5f9..14e3025 100644
--- a/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnotationClientApplication.java
+++ b/sofarpc-sample/src/main/java/com/alipay/sofa/rpc/samples/annotation/AnotationClientApplication.java
@@ -27,7 +27,6 @@
 public class AnotationClientApplication {
 
     public static void main(String[] args) {
-
         //change port to run in local machine
         System.setProperty("server.port", "8081");
 
@@ -38,7 +37,6 @@ public static void main(String[] args) {
 
         AnnotationClientImpl annotationService = applicationContext
             .getBean(AnnotationClientImpl.class);
-
         String result = annotationService.sayClientAnnotation("annotation");
         System.out.println("invoke result:" + result);