dependencies: #2449 bump maven-checkstyle-plugin from 3.1.0 to 3.2.0 + resolve chec… (#2464)

* #2449 bump maven-checkstyle-plugin from 3.1.0 to 3.2.0 + resolve checkstyle issues

* remove FileSelectorJFrame.java to resolve checkstyle issue

* remove FileSelectorJFrame.java to resolve checkstyle issue

* remove FileSelectorJFrame.java to resolve checkstyle issue

* add refactored file with correct filename to resolve checkstyle issue

* add the test data

* change filenames from JFrame to Jframe for checkstyle

* fix code smell from  sonar report

* add new testcases to improve the test coverage

* remove code smell

caching/src/main/java/com/iluwatar/caching/AppManager.java

@@ -25,9 +25,7 @@
 package com.iluwatar.caching;
 
 import com.iluwatar.caching.database.DbManager;
-
 import java.util.Optional;
-
 import lombok.extern.slf4j.Slf4j;
 
 /**

caching/src/main/java/com/iluwatar/caching/CacheStore.java

@@ -28,7 +28,6 @@ import com.iluwatar.caching.database.DbManager;
 import java.util.List;
 import java.util.Optional;
 import java.util.stream.Collectors;
-
 import lombok.extern.slf4j.Slf4j;
 
 /**

caching/src/main/java/com/iluwatar/caching/database/MongoDb.java

@@ -52,7 +52,7 @@ public class MongoDb implements DbManager {
   private MongoClient client;
   private MongoDatabase db;
 
-  void setDB(MongoDatabase db) {
+  void setDb(MongoDatabase db) {
     this.db = db;
   }
 

caching/src/main/java/com/iluwatar/caching/database/VirtualDb.java

@@ -25,7 +25,6 @@
 package com.iluwatar.caching.database;
 
 import com.iluwatar.caching.UserAccount;
-
 import java.util.HashMap;
 import java.util.Map;
 

caching/src/test/java/com/iluwatar/caching/database/MongoDbTest.java

@@ -55,7 +55,7 @@ class MongoDbTest {
   @BeforeEach
   void init() {
     db = mock(MongoDatabase.class);
-    mongoDb.setDB(db);
+    mongoDb.setDb(db);
     userAccount = new UserAccount(ID, NAME, ADDITIONAL_INFO);
   }