diff --git a/src/main/java/org/codelibs/fess/app/web/admin/maintenance/AdminMaintenanceAction.java b/src/main/java/org/codelibs/fess/app/web/admin/maintenance/AdminMaintenanceAction.java
index 20217b795..c7fdcd27a 100644
--- a/src/main/java/org/codelibs/fess/app/web/admin/maintenance/AdminMaintenanceAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/admin/maintenance/AdminMaintenanceAction.java
@@ -15,9 +15,7 @@
  */
 package org.codelibs.fess.app.web.admin.maintenance;
 
-import java.io.BufferedWriter;
 import java.io.IOException;
-import java.io.OutputStreamWriter;
 import java.net.InetAddress;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -35,7 +33,6 @@ import javax.annotation.Resource;
 import org.apache.commons.text.StringEscapeUtils;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import org.codelibs.core.exception.IORuntimeException;
 import org.codelibs.core.io.CopyUtil;
 import org.codelibs.core.lang.StringUtil;
 import org.codelibs.curl.CurlResponse;