diff --git a/dubbo-registry/dubbo-registry-nacos/pom.xml b/dubbo-registry/dubbo-registry-nacos/pom.xml
index 15e27e21a0c8..9393c32d3889 100644
--- a/dubbo-registry/dubbo-registry-nacos/pom.xml
+++ b/dubbo-registry/dubbo-registry-nacos/pom.xml
@@ -23,7 +23,6 @@
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
-    <groupId>org.apache.dubbo</groupId>
     <artifactId>dubbo-registry-nacos</artifactId>
     <name>${project.artifactId}</name>
     <description>The Nacos registry module of Dubbo project</description>
diff --git a/dubbo-registry/dubbo-registry-zookeeper/src/main/java/org/apache/dubbo/registry/zookeeper/ZookeeperRegistry.java b/dubbo-registry/dubbo-registry-zookeeper/src/main/java/org/apache/dubbo/registry/zookeeper/ZookeeperRegistry.java
index 93f584aac22e..1c3eb27e982e 100644
--- a/dubbo-registry/dubbo-registry-zookeeper/src/main/java/org/apache/dubbo/registry/zookeeper/ZookeeperRegistry.java
+++ b/dubbo-registry/dubbo-registry-zookeeper/src/main/java/org/apache/dubbo/registry/zookeeper/ZookeeperRegistry.java
@@ -54,7 +54,7 @@ public class ZookeeperRegistry extends FailbackRegistry {
 
     private final Set<String> anyServices = new ConcurrentHashSet<>();
 
-    private final ConcurrentMap<URL, ConcurrentMap<NotifyListener, ChildListener>> zkListeners = new ConcurrentHashMap<URL, ConcurrentMap<NotifyListener, ChildListener>>();
+    private final ConcurrentMap<URL, ConcurrentMap<NotifyListener, ChildListener>> zkListeners = new ConcurrentHashMap<>();
 
     private final ZookeeperClient zkClient;