Merge pull request #3333, add @OverRide for sub-class method.

dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/Configurator.java

@@ -98,6 +98,7 @@ static Optional<List<Configurator>> toConfigurators(List<URL> urls) {
      * 1. the url with a specific host ip should have higher priority than 0.0.0.0
      * 2. if two url has the same host, compare by priority value；
      */
+    @Override
     default int compareTo(Configurator o) {
         if (o == null) {
             return -1;

dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/router/AbstractRouter.java

@@ -62,6 +62,7 @@ public void setForce(boolean force) {
         this.force = force;
     }
 
+    @Override
     public int getPriority() {
         return priority;
     }

dubbo-compatible/src/main/java/com/alibaba/dubbo/rpc/Protocol.java

@@ -22,14 +22,16 @@
 @Deprecated
 public interface Protocol extends org.apache.dubbo.rpc.Protocol {
 
-    <T> Exporter<T> export(Invoker <T> invoker) throws RpcException;
+    <T> Exporter<T> export(Invoker<T> invoker) throws RpcException;
 
     <T> Invoker<T> refer(Class<T> aClass, URL url) throws RpcException;
 
+    @Override
     default <T> org.apache.dubbo.rpc.Exporter<T> export(org.apache.dubbo.rpc.Invoker<T> invoker) throws RpcException {
         return this.export(new Invoker.CompatibleInvoker<>(invoker));
     }
 
+    @Override
     default <T> org.apache.dubbo.rpc.Invoker<T> refer(Class<T> aClass, org.apache.dubbo.common.URL url) throws RpcException {
         return this.refer(aClass, new URL(url));
     }

dubbo-compatible/src/main/java/org/apache/dubbo/config/spring/beans/factory/annotation/CompatibleReferenceBeanBuilder.java

@@ -17,7 +17,6 @@
 package org.apache.dubbo.config.spring.beans.factory.annotation;
 
 import com.alibaba.dubbo.config.annotation.Reference;
-
 import org.apache.dubbo.common.utils.CollectionUtils;
 import org.apache.dubbo.config.ConsumerConfig;
 import org.apache.dubbo.config.spring.ReferenceBean;
@@ -104,7 +103,7 @@ protected void preConfigureBean(Reference reference, ReferenceBean referenceBean
         dataBinder.registerCustomEditor(String.class, "filter", new StringTrimmerEditor(true));
         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);
@@ -161,7 +160,7 @@ protected void postConfigureBean(Reference annotation, ReferenceBean bean) throw
     }
 
     public static CompatibleReferenceBeanBuilder create(Reference annotation, ClassLoader classLoader,
-                                              ApplicationContext applicationContext) {
+                                                        ApplicationContext applicationContext) {
         return new CompatibleReferenceBeanBuilder(annotation, classLoader, applicationContext);
     }
 

dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/beans/factory/annotation/AnnotationInjectedBeanPostProcessor.java

@@ -113,6 +113,7 @@ public final Class<A> getAnnotationType() {
         return annotationType;
     }
 
+    @Override
     public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
         Assert.isInstanceOf(ConfigurableListableBeanFactory.class, beanFactory,
                 "AnnotationInjectedBeanPostProcessor requires a ConfigurableListableBeanFactory");
@@ -293,6 +294,7 @@ public void setBeanClassLoader(ClassLoader classLoader) {
         this.classLoader = classLoader;
     }
 
+    @Override
     public void setEnvironment(Environment environment) {
         this.environment = environment;
     }

dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/beans/factory/annotation/ReferenceBeanBuilder.java

@@ -102,7 +102,7 @@ protected void preConfigureBean(Reference reference, ReferenceBean referenceBean
         dataBinder.registerCustomEditor(String.class, "filter", new StringTrimmerEditor(true));
         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);

dubbo-remoting/dubbo-remoting-zookeeper/src/main/java/org/apache/dubbo/remoting/zookeeper/curator/CuratorZookeeperTransporter.java

@@ -21,7 +21,7 @@
 import org.apache.dubbo.remoting.zookeeper.support.AbstractZookeeperTransporter;
 
 public class CuratorZookeeperTransporter extends AbstractZookeeperTransporter {
-
+    @Override
     public ZookeeperClient createZookeeperClient(URL url) {
         return new CuratorZookeeperClient(url);
     }

dubbo-remoting/dubbo-remoting-zookeeper/src/main/java/org/apache/dubbo/remoting/zookeeper/support/AbstractZookeeperTransporter.java

@@ -47,6 +47,7 @@ public abstract class AbstractZookeeperTransporter implements ZookeeperTransport
      * @param url
      * @return
      */
+    @Override
     public ZookeeperClient connect(URL url) {
         ZookeeperClient zookeeperClient;
         List<String> addressList = getURLBackupAddress(url);

dubbo-remoting/dubbo-remoting-zookeeper/src/main/java/org/apache/dubbo/remoting/zookeeper/zkclient/ZkclientZookeeperTransporter.java

@@ -21,7 +21,7 @@
 import org.apache.dubbo.remoting.zookeeper.support.AbstractZookeeperTransporter;
 
 public class ZkclientZookeeperTransporter extends AbstractZookeeperTransporter {
-
+    @Override
     public ZookeeperClient createZookeeperClient(URL url) {
         return new ZkclientZookeeperClient(url);
     }