diff --git a/src/main/java/org/codelibs/fess/app/web/cache/CacheAction.java b/src/main/java/org/codelibs/fess/app/web/cache/CacheAction.java
index 981c63a7f..6a2f93264 100644
--- a/src/main/java/org/codelibs/fess/app/web/cache/CacheAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/cache/CacheAction.java
@@ -52,6 +52,8 @@ public class CacheAction extends FessSearchAction {
             return redirectToLogin();
         }
 
+        validate(form, messages -> {}, () -> asHtml(path_Error_ErrorJsp));
+
         Map<String, Object> doc = null;
         try {
             doc =
diff --git a/src/main/java/org/codelibs/fess/app/web/cache/CacheForm.java b/src/main/java/org/codelibs/fess/app/web/cache/CacheForm.java
index 2eca0aa26..28d0b569c 100644
--- a/src/main/java/org/codelibs/fess/app/web/cache/CacheForm.java
+++ b/src/main/java/org/codelibs/fess/app/web/cache/CacheForm.java
@@ -17,13 +17,27 @@ package org.codelibs.fess.app.web.cache;
 
 import java.io.Serializable;
 
+import javax.validation.constraints.Size;
+
+import org.lastaflute.web.validation.Required;
+
 public class CacheForm implements Serializable {
     private static final long serialVersionUID = 1L;
 
-    //@Required(target = "go,cache")
-    //@Maxbytelength(maxbytelength = 100)
+    @Required
+    @Size(max = 100)
     public String docId;
 
     public String[] hq;
 
+    // for error page
+
+    public String q;
+
+    public String num;
+
+    public String sort;
+
+    public String lang;
+
 }
diff --git a/src/main/java/org/codelibs/fess/app/web/go/GoForm.java b/src/main/java/org/codelibs/fess/app/web/go/GoForm.java
index 2fd3db125..3aa8a8064 100644
--- a/src/main/java/org/codelibs/fess/app/web/go/GoForm.java
+++ b/src/main/java/org/codelibs/fess/app/web/go/GoForm.java
@@ -34,4 +34,14 @@ public class GoForm {
     public String queryId;
 
     public Integer order;
+
+    // for error page
+
+    public String q;
+
+    public String num;
+
+    public String sort;
+
+    public String lang;
 }
diff --git a/src/main/java/org/codelibs/fess/app/web/screenshot/ScreenshotAction.java b/src/main/java/org/codelibs/fess/app/web/screenshot/ScreenshotAction.java
index 8cbaab633..8bdb9e7fd 100644
--- a/src/main/java/org/codelibs/fess/app/web/screenshot/ScreenshotAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/screenshot/ScreenshotAction.java
@@ -52,6 +52,8 @@ public class ScreenshotAction extends FessSearchAction {
             return redirectToLogin();
         }
 
+        validate(form, messages -> {}, () -> asHtml(path_Error_ErrorJsp));
+
         final Map<String, Object> doc =
                 fessEsClient.getDocument(fessConfig.getIndexDocumentSearchIndex(), fessConfig.getIndexDocumentType(),
                         queryRequestBuilder -> {
diff --git a/src/main/java/org/codelibs/fess/app/web/screenshot/ScreenshotForm.java b/src/main/java/org/codelibs/fess/app/web/screenshot/ScreenshotForm.java
index 4b2a38fcb..4b481f0af 100644
--- a/src/main/java/org/codelibs/fess/app/web/screenshot/ScreenshotForm.java
+++ b/src/main/java/org/codelibs/fess/app/web/screenshot/ScreenshotForm.java
@@ -17,11 +17,28 @@ package org.codelibs.fess.app.web.screenshot;
 
 import java.io.Serializable;
 
+import javax.validation.constraints.Size;
+
+import org.lastaflute.web.validation.Required;
+
 public class ScreenshotForm implements Serializable {
     private static final long serialVersionUID = 1L;
 
+    @Required
+    @Size(max = 100)
     public String docId;
 
+    @Required
     public String queryId;
 
+    // for error page
+
+    public String q;
+
+    public String num;
+
+    public String sort;
+
+    public String lang;
+
 }