add the lost @Override annotation of Config. (#8384)

diff --git a/dubbo-common/src/main/java/org/apache/dubbo/config/AbstractServiceConfig.java b/dubbo-common/src/main/java/org/apache/dubbo/config/AbstractServiceConfig.java
index 74980f2..6bbd9bf 100644
--- a/dubbo-common/src/main/java/org/apache/dubbo/config/AbstractServiceConfig.java
+++ b/dubbo-common/src/main/java/org/apache/dubbo/config/AbstractServiceConfig.java
@@ -134,18 +134,22 @@
         }
     }
 
+    @Override
     public String getVersion() {
         return version;
     }
 
+    @Override
     public void setVersion(String version) {
         this.version = version;
     }
 
+    @Override
     public String getGroup() {
         return group;
     }
 
+    @Override
     public void setGroup(String group) {
         this.group = group;
     }
diff --git a/dubbo-common/src/main/java/org/apache/dubbo/config/ReferenceConfigBase.java b/dubbo-common/src/main/java/org/apache/dubbo/config/ReferenceConfigBase.java
index ac0f7ce..28d462b 100644
--- a/dubbo-common/src/main/java/org/apache/dubbo/config/ReferenceConfigBase.java
+++ b/dubbo-common/src/main/java/org/apache/dubbo/config/ReferenceConfigBase.java
@@ -200,10 +200,12 @@
         return null;
     }
 
+    @Override
     public String getInterface() {
         return interfaceName;
     }
 
+    @Override
     public void setInterface(String interfaceName) {
         this.interfaceName = interfaceName;
     }
diff --git a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ServiceConfig.java b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ServiceConfig.java
index 7e3edb3..5064f52 100644
--- a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ServiceConfig.java
+++ b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ServiceConfig.java
@@ -209,6 +209,7 @@
         serviceMetadata.generateServiceKey();
     }
 
+    @Override
     public synchronized void export() {
         if (this.shouldExport() && !this.exported) {
             this.init();