diff --git a/src/main/java/org/codelibs/fess/app/web/base/FessAdminAction.java b/src/main/java/org/codelibs/fess/app/web/base/FessAdminAction.java
index a977c0b64..066b32763 100644
--- a/src/main/java/org/codelibs/fess/app/web/base/FessAdminAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/base/FessAdminAction.java
@@ -25,11 +25,15 @@ import org.codelibs.core.beans.util.CopyOptions;
 import org.codelibs.fess.exception.UserRoleLoginException;
 import org.codelibs.fess.helper.SystemHelper;
 import org.dbflute.optional.OptionalThing;
+import org.lastaflute.core.message.MessageManager;
+import org.lastaflute.core.message.UserMessages;
 import org.lastaflute.di.util.LdiFileUtil;
 import org.lastaflute.web.login.LoginManager;
 import org.lastaflute.web.response.ActionResponse;
 import org.lastaflute.web.ruts.process.ActionRuntime;
+import org.lastaflute.web.servlet.request.RequestManager;
 import org.lastaflute.web.util.LaServletContextUtil;
+import org.lastaflute.web.validation.ActionValidator;
 
 /**
  * @author codelibs
@@ -44,6 +48,12 @@ public abstract class FessAdminAction extends FessBaseAction {
     @Resource
     protected SystemHelper systemHelper;
 
+    @Resource
+    private MessageManager messageManager;
+
+    @Resource
+    private RequestManager requestManager;
+
     // ===================================================================================
     //                                                                        Small Helper
     //                                                                        ============
@@ -76,6 +86,16 @@ public abstract class FessAdminAction extends FessBaseAction {
         return buf.toString();
     }
 
+    @SuppressWarnings("unchecked")
+    @Override
+    protected <MESSAGES extends UserMessages> ActionValidator<MESSAGES> createValidator(Class<?>... groups) { // for explicit groups
+        return systemHelper.createValidator(messageManager // to get validation message
+                , () -> requestManager.getUserLocale() // used with messageManager
+                , () -> (MESSAGES) createMessages() // for new user messages
+                , () -> handleApiValidationError() // apiFailureHook
+                , groups);
+    }
+
     // ===================================================================================
     //                                                                            Document
     //                                                                            ========
diff --git a/src/main/java/org/codelibs/fess/helper/SystemHelper.java b/src/main/java/org/codelibs/fess/helper/SystemHelper.java
index 770c5e658..02aed669e 100644
--- a/src/main/java/org/codelibs/fess/helper/SystemHelper.java
+++ b/src/main/java/org/codelibs/fess/helper/SystemHelper.java
@@ -47,9 +47,15 @@ import org.codelibs.fess.crawler.util.CharUtil;
 import org.codelibs.fess.mylasta.action.FessUserBean;
 import org.codelibs.fess.mylasta.direction.FessConfig;
 import org.codelibs.fess.util.ComponentUtil;
+import org.lastaflute.core.message.MessageManager;
+import org.lastaflute.core.message.UserMessages;
+import org.lastaflute.core.message.supplier.MessageLocaleProvider;
+import org.lastaflute.core.message.supplier.UserMessagesCreator;
 import org.lastaflute.web.TypicalAction;
 import org.lastaflute.web.ruts.process.ActionRuntime;
 import org.lastaflute.web.servlet.request.RequestManager;
+import org.lastaflute.web.validation.ActionValidator;
+import org.lastaflute.web.validation.VaErrorHook;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -316,4 +322,10 @@ public class SystemHelper {
         return previousClusterState.getAndSet(status) != status;
     }
 
+    public <MESSAGES extends UserMessages> ActionValidator<MESSAGES> createValidator(MessageManager messageManager,
+            MessageLocaleProvider messageLocaleProvider, UserMessagesCreator<MESSAGES> userMessagesCreator, VaErrorHook apiFailureHook,
+            Class<?>... runtimeGroups) {
+        return new ActionValidator<MESSAGES>(messageManager, messageLocaleProvider, userMessagesCreator, apiFailureHook, runtimeGroups);
+    }
+
 }