diff --git a/src/main/java/org/codelibs/fess/api/json/JsonApiManager.java b/src/main/java/org/codelibs/fess/api/json/JsonApiManager.java
index 8c9957ec2..97d63d839 100644
--- a/src/main/java/org/codelibs/fess/api/json/JsonApiManager.java
+++ b/src/main/java/org/codelibs/fess/api/json/JsonApiManager.java
@@ -263,9 +263,9 @@ public class JsonApiManager extends BaseApiManager {
                     buf.append(',');
                     buf.append("\"geo\":");
                     try {
-                        XContentBuilder builder = XContentFactory.jsonBuilder();
+                        final XContentBuilder builder = XContentFactory.jsonBuilder();
                         buf.append(geoInfo.toQueryBuilder().toXContent(builder, ToXContent.EMPTY_PARAMS).string());
-                    } catch (Exception e) {
+                    } catch (final Exception e) {
                         buf.append("{ \"error\" : \"").append(ExceptionsHelper.detailedMessage(e)).append("\"}");
                     }
                 }
diff --git a/src/main/java/org/codelibs/fess/es/user/exentity/User.java b/src/main/java/org/codelibs/fess/es/user/exentity/User.java
index 87f24fd2b..f92f7721b 100644
--- a/src/main/java/org/codelibs/fess/es/user/exentity/User.java
+++ b/src/main/java/org/codelibs/fess/es/user/exentity/User.java
@@ -63,7 +63,7 @@ public class User extends BsUser implements FessUser {
         return stream(getGroups()).get(stream -> stream.map(s -> decode(s)).toArray(n -> new String[n]));
     }
 
-    private String decode(String value) {
+    private String decode(final String value) {
         return new String(Base64.getDecoder().decode(value), Constants.CHARSET_UTF_8);
     }
 
diff --git a/src/main/java/org/codelibs/fess/helper/QueryHelper.java b/src/main/java/org/codelibs/fess/helper/QueryHelper.java
index 4358a82de..7876a7d2c 100644
--- a/src/main/java/org/codelibs/fess/helper/QueryHelper.java
+++ b/src/main/java/org/codelibs/fess/helper/QueryHelper.java
@@ -581,7 +581,7 @@ public class QueryHelper implements Serializable {
         this.highlightedFields = highlightedFields;
     }
 
-    public void highlightedFields(Consumer<Stream<String>> stream) {
+    public void highlightedFields(final Consumer<Stream<String>> stream) {
         stream(highlightedFields).of(stream);
         ;
     }
diff --git a/src/main/java/org/codelibs/fess/util/ComponentUtil.java b/src/main/java/org/codelibs/fess/util/ComponentUtil.java
index de89898d8..0840c64ca 100644
--- a/src/main/java/org/codelibs/fess/util/ComponentUtil.java
+++ b/src/main/java/org/codelibs/fess/util/ComponentUtil.java
@@ -375,7 +375,7 @@ public final class ComponentUtil {
      * 
      * @param fessConfig
      */
-    public static void setFessConfig(FessConfig fessConfig) {
+    public static void setFessConfig(final FessConfig fessConfig) {
         ComponentUtil.fessConfig = fessConfig;
     }