FINERACT-2181: Refactor code quality

custom/acme/note/service/src/main/java/com/acme/fineract/portfolio/note/service/AcmeNoteReadPlatformService.java

@@ -18,6 +18,7 @@
  */
 package com.acme.fineract.portfolio.note.service;
 
+import java.util.Collections;
 import java.util.List;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.fineract.portfolio.note.data.NoteData;
@@ -43,6 +44,6 @@ public class AcmeNoteReadPlatformService implements NoteReadPlatformService, Ini
 
     @Override
     public List<NoteData> retrieveNotesByResource(Long resourceId, Integer noteTypeId) {
-        return null;
+        return Collections.emptyList();
     }
 }

custom/acme/note/starter/src/test/java/com/acme/fineract/portfolio/note/starter/AcmeNoteServiceStepDefinitions.java

@@ -42,7 +42,7 @@ public class AcmeNoteServiceStepDefinitions implements En {
                 });
 
         When("/^The user retrieves the service of interface class (.*)$/", (String interfaceClassName) -> {
-            contextRunner.run((ctx) -> {
+            contextRunner.run(ctx -> {
                 this.interfaceClass = Class.forName(interfaceClassName.trim());
 
                 assertThat(this.interfaceClass.isInterface()).isTrue();