code clean up

src/main/java/org/codelibs/fess/api/es/EsApiManager.java

@@ -213,7 +213,7 @@ public class EsApiManager extends BaseApiManager {
     }
 
     @Override
-    protected void writeHeaders(HttpServletResponse response) {
+    protected void writeHeaders(final HttpServletResponse response) {
         ComponentUtil.getFessConfig().getApiDashboardResponseHeaderList().forEach(e -> response.setHeader(e.getFirst(), e.getSecond()));
     }
 }

src/main/java/org/codelibs/fess/api/gsa/GsaApiManager.java

@@ -646,7 +646,7 @@ public class GsaApiManager extends BaseApiManager implements WebApiManager {
     }
 
     @Override
-    protected void writeHeaders(HttpServletResponse response) {
+    protected void writeHeaders(final HttpServletResponse response) {
         ComponentUtil.getFessConfig().getApiGsaResponseHeaderList().forEach(e -> response.setHeader(e.getFirst(), e.getSecond()));
     }
 }

src/main/java/org/codelibs/fess/api/json/JsonApiManager.java

@@ -814,7 +814,7 @@ public class JsonApiManager extends BaseJsonApiManager {
     }
 
     @Override
-    protected void writeHeaders(HttpServletResponse response) {
+    protected void writeHeaders(final HttpServletResponse response) {
         ComponentUtil.getFessConfig().getApiJsonResponseHeaderList().forEach(e -> response.setHeader(e.getFirst(), e.getSecond()));
     }
 }

src/main/java/org/codelibs/fess/api/suggest/SuggestApiManager.java

@@ -302,7 +302,7 @@ public class SuggestApiManager extends BaseJsonApiManager {
     }
 
     @Override
-    protected void writeHeaders(HttpServletResponse response) {
+    protected void writeHeaders(final HttpServletResponse response) {
         ComponentUtil.getFessConfig().getApiJsonResponseHeaderList().forEach(e -> response.setHeader(e.getFirst(), e.getSecond()));
     }
 }

src/main/java/org/codelibs/fess/es/client/FessEsClient.java

@@ -1496,14 +1496,14 @@ public class FessEsClient implements Client {
     }
 
     @Override
-    public <Request extends ActionRequest, Response extends ActionResponse> ActionFuture<Response> execute(Action<Response> action,
-            Request request) {
+    public <Request extends ActionRequest, Response extends ActionResponse> ActionFuture<Response> execute(final Action<Response> action,
+            final Request request) {
         return client.execute(action, request);
     }
 
     @Override
-    public <Request extends ActionRequest, Response extends ActionResponse> void execute(Action<Response> action, Request request,
-            ActionListener<Response> listener) {
+    public <Request extends ActionRequest, Response extends ActionResponse> void execute(final Action<Response> action,
+            final Request request, final ActionListener<Response> listener) {
         client.execute(action, request, listener);
     }
 

src/main/java/org/codelibs/fess/es/config/exentity/CrawlingConfig.java

@@ -65,7 +65,7 @@ public interface CrawlingConfig {
     public enum ConfigType {
         WEB("W"), FILE("F"), DATA("D");
 
-        private String typePrefix;
+        private final String typePrefix;
 
         ConfigType(final String typePrefix) {
             this.typePrefix = typePrefix;

src/main/java/org/codelibs/fess/helper/LanguageHelper.java

@@ -99,7 +99,7 @@ public class LanguageHelper {
         return null;
     }
 
-    public void setDetector(LanguageDetector detector) {
+    public void setDetector(final LanguageDetector detector) {
         this.detector = detector;
     }