For PMD.

auth/src/main/java/com/alibaba/nacos/auth/context/GrpcIdentityContextBuilder.java

@@ -24,6 +24,11 @@ import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 
+/**
+ * Identity context builder for Grpc.
+ *
+ * @author Nacos
+ */
 public class GrpcIdentityContextBuilder implements IdentityContextBuilder<Request> {
     
     AuthConfigs authConfigs;
@@ -53,4 +58,4 @@ public class GrpcIdentityContextBuilder implements IdentityContextBuilder<Reques
         }
         return identityContext;
     }
-}
+}

auth/src/main/java/com/alibaba/nacos/auth/context/HttpIdentityContextBuilder.java

@@ -25,6 +25,11 @@ import java.util.Enumeration;
 import java.util.HashSet;
 import java.util.Set;
 
+/**
+ * Identity context builder for HTTP.
+ *
+ * @author Nacos
+ */
 public class HttpIdentityContextBuilder implements IdentityContextBuilder<HttpServletRequest> {
     
     private AuthConfigs authConfigs;
@@ -71,4 +76,4 @@ public class HttpIdentityContextBuilder implements IdentityContextBuilder<HttpSe
         }
         return identityContext;
     }
-}
+}

auth/src/main/java/com/alibaba/nacos/auth/model/Page.java

@@ -23,6 +23,8 @@ import java.util.List;
 /**
  * Page.
  * copy from config module for resolving circular dependency.
+ *
+ * @author boyan
  */
 public class Page<E> implements Serializable {
     

auth/src/main/java/com/alibaba/nacos/auth/persist/repository/embedded/AuthEmbeddedStoragePersistServiceImpl.java

@@ -10,6 +10,11 @@ import org.springframework.stereotype.Component;
 
 import javax.annotation.PostConstruct;
 
+/**
+ * Auth persist service for embedded storage.
+ *
+ * @author Nacos
+ */
 @Conditional(value = ConditionOnEmbeddedStorage.class)
 @Component
 public class AuthEmbeddedStoragePersistServiceImpl {

auth/src/main/java/com/alibaba/nacos/auth/persist/repository/externel/AuthExternalStoragePersistServiceImpl.java

@@ -26,6 +26,11 @@ import org.springframework.stereotype.Component;
 
 import javax.annotation.PostConstruct;
 
+/**
+ * Auth persist service for external storage.
+ *
+ * @author Nacos
+ */
 @SuppressWarnings(value = {"PMD.MethodReturnWrapperTypeRule", "checkstyle:linelength"})
 @Conditional(value = ConditionOnExternalStorage.class)
 @Component