diff --git a/cosky-rest-api/src/main/java/me/ahoo/cosky/rest/security/user/User.java b/cosky-rest-api/src/main/java/me/ahoo/cosky/rest/security/user/User.java
index 1c227dfa..c7589d23 100644
--- a/cosky-rest-api/src/main/java/me/ahoo/cosky/rest/security/user/User.java
+++ b/cosky-rest-api/src/main/java/me/ahoo/cosky/rest/security/user/User.java
@@ -22,7 +22,8 @@
  * @author ahoo wang
  */
 public class User {
-    public static String SUPER_USER = CoSky.COSKY;
+
+    public final static String SUPER_USER = CoSky.COSKY;
 
     private String username;
     private Set<String> roleBind;
diff --git a/spring-cloud-starter-cosky-discovery-ribbon/src/main/java/me/ahoo/cosky/discovery/spring/cloud/discovery/ribbon/CoskyServerList.java b/spring-cloud-starter-cosky-discovery-ribbon/src/main/java/me/ahoo/cosky/discovery/spring/cloud/discovery/ribbon/CoskyServerList.java
index b3666cdf..881943bc 100644
--- a/spring-cloud-starter-cosky-discovery-ribbon/src/main/java/me/ahoo/cosky/discovery/spring/cloud/discovery/ribbon/CoskyServerList.java
+++ b/spring-cloud-starter-cosky-discovery-ribbon/src/main/java/me/ahoo/cosky/discovery/spring/cloud/discovery/ribbon/CoskyServerList.java
@@ -49,7 +49,7 @@ private List<CoskyServer> getCoskyServers() {
         var getInstancesFuture = serviceDiscovery.getInstances(this.serviceId);
         var instances = Futures.getUnChecked(getInstancesFuture, Duration.ofSeconds(2));
         if (instances.isEmpty()) {
-            Collections.emptyList();
+           return Collections.emptyList();
         }
         return instances.stream().map(CoskyServer::new).collect(Collectors.toList());
     }