diff --git a/dubbo-metadata/dubbo-metadata-api/src/main/java/org/apache/dubbo/metadata/ServiceNameMapping.java b/dubbo-metadata/dubbo-metadata-api/src/main/java/org/apache/dubbo/metadata/ServiceNameMapping.java
index 58cd87d6c4..074080f520 100644
--- a/dubbo-metadata/dubbo-metadata-api/src/main/java/org/apache/dubbo/metadata/ServiceNameMapping.java
+++ b/dubbo-metadata/dubbo-metadata-api/src/main/java/org/apache/dubbo/metadata/ServiceNameMapping.java
@@ -70,10 +70,4 @@ public interface ServiceNameMapping {
         return DEFAULT_MAPPING_GROUP + SLASH + serviceInterface;
     }
 
-    static class MappingException extends RuntimeException {
-        public MappingException(String message) {
-            super(message);
-        }
-    }
-
 }
diff --git a/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/DefaultServiceInstance.java b/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/DefaultServiceInstance.java
index eb581f945c..ff6af6673d 100644
--- a/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/DefaultServiceInstance.java
+++ b/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/DefaultServiceInstance.java
@@ -184,7 +184,7 @@ public class DefaultServiceInstance implements ServiceInstance {
             if (entry.getKey().equals(REVISION_KEY)) {
                 continue;
             }
-            equals = equals && !entry.getValue().equals(that.getMetadata().get(entry.getKey()));
+            equals = equals && entry.getValue().equals(that.getMetadata().get(entry.getKey()));
         }
 
         return equals;