diff --git a/src/main/java/org/codelibs/fess/app/service/JobLogService.java b/src/main/java/org/codelibs/fess/app/service/JobLogService.java
index 2f077fe87..421617e49 100644
--- a/src/main/java/org/codelibs/fess/app/service/JobLogService.java
+++ b/src/main/java/org/codelibs/fess/app/service/JobLogService.java
@@ -88,7 +88,7 @@ public class JobLogService implements Serializable {
     }
 
     public void deleteBefore(final int days) {
-        final long oneday = (long) 24 * 60 * 60 * 1000;
+        final long oneday = 24 * 60 * 60 * 1000L;
         final long targetTime = ComponentUtil.getSystemHelper().getCurrentTimeAsLong() - days * oneday;
         jobLogBhv.queryDelete(cb -> {
             cb.query().setEndTime_LessThan(targetTime);
diff --git a/src/main/java/org/codelibs/fess/ds/impl/CsvListDataStoreImpl.java b/src/main/java/org/codelibs/fess/ds/impl/CsvListDataStoreImpl.java
index bddab3753..e8990dcb2 100644
--- a/src/main/java/org/codelibs/fess/ds/impl/CsvListDataStoreImpl.java
+++ b/src/main/java/org/codelibs/fess/ds/impl/CsvListDataStoreImpl.java
@@ -35,7 +35,7 @@ public class CsvListDataStoreImpl extends CsvDataStoreImpl {
 
     public boolean deleteProcessedFile = true;
 
-    public long csvFileTimestampMargin = (long) 60 * 1000;// 1min
+    public long csvFileTimestampMargin = 60 * 1000L;// 1min
 
     public boolean ignoreDataStoreException = true;
 
diff --git a/src/main/java/org/codelibs/fess/helper/SearchLogHelper.java b/src/main/java/org/codelibs/fess/helper/SearchLogHelper.java
index 991fa05a5..b530e6584 100644
--- a/src/main/java/org/codelibs/fess/helper/SearchLogHelper.java
+++ b/src/main/java/org/codelibs/fess/helper/SearchLogHelper.java
@@ -62,7 +62,7 @@ public class SearchLogHelper {
     @Resource
     protected DynamicProperties systemProperties;
 
-    public long userCheckInterval = (long) 5 * 60 * 1000;// 5 min
+    public long userCheckInterval = 5 * 60 * 1000L;// 5 min
 
     public int userInfoCacheSize = 1000;
 
diff --git a/src/main/java/org/codelibs/fess/mylasta/direction/sponsor/FessMultipartRequestHandler.java b/src/main/java/org/codelibs/fess/mylasta/direction/sponsor/FessMultipartRequestHandler.java
index 7a2d36a33..8ef98b0aa 100644
--- a/src/main/java/org/codelibs/fess/mylasta/direction/sponsor/FessMultipartRequestHandler.java
+++ b/src/main/java/org/codelibs/fess/mylasta/direction/sponsor/FessMultipartRequestHandler.java
@@ -53,7 +53,7 @@ public class FessMultipartRequestHandler implements MultipartRequestHandler {
     //                                                                          Definition
     //                                                                          ==========
     private static final Logger logger = LoggerFactory.getLogger(FessMultipartRequestHandler.class);
-    public static final long DEFAULT_SIZE_MAX = (long) 250 * 1024 * 1024; // 250MB
+    public static final long DEFAULT_SIZE_MAX = 250 * 1024 * 1024L; // 250MB
     public static final int DEFAULT_SIZE_THRESHOLD = 256 * 1024; // 250KB
     protected static final String CONTEXT_TEMPDIR_KEY = "javax.servlet.context.tempdir";
     protected static final String JAVA_IO_TMPDIR_KEY = "java.io.tmpdir";
diff --git a/src/main/java/org/codelibs/fess/screenshot/ScreenShotManager.java b/src/main/java/org/codelibs/fess/screenshot/ScreenShotManager.java
index 4a9370e77..b824b053d 100644
--- a/src/main/java/org/codelibs/fess/screenshot/ScreenShotManager.java
+++ b/src/main/java/org/codelibs/fess/screenshot/ScreenShotManager.java
@@ -50,7 +50,7 @@ public class ScreenShotManager {
 
     protected File baseDir;
 
-    public long shutdownTimeout = (long) 5 * 60 * 1000; // 5min
+    public long shutdownTimeout = 5 * 60 * 1000L; // 5min
 
     public int screenShotPathCacheSize = 10;
 
diff --git a/src/main/java/org/codelibs/fess/screenshot/impl/CommandGenerator.java b/src/main/java/org/codelibs/fess/screenshot/impl/CommandGenerator.java
index 3b20b2950..d2fc2e73e 100644
--- a/src/main/java/org/codelibs/fess/screenshot/impl/CommandGenerator.java
+++ b/src/main/java/org/codelibs/fess/screenshot/impl/CommandGenerator.java
@@ -36,7 +36,7 @@ public class CommandGenerator extends BaseScreenShotGenerator {
 
     public List<String> commandList;
 
-    public long commandTimeout = (long) 10 * 1000;// 10sec
+    public long commandTimeout = 10 * 1000L;// 10sec
 
     public File baseDir;