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

metadata-mapping/src/main/java/com/iluwatar/metamapping/App.java

@@ -62,7 +62,7 @@ public class App {
     // get service
     var userService = new UserService();
     // use create service to add users
-    for (var user: generateSampleUsers()) {
+    for (var user : generateSampleUsers()) {
       var id = userService.createUser(user);
       LOGGER.info("Add user" + user + "at" + id + ".");
     }

metadata-mapping/src/main/java/com/iluwatar/metamapping/utils/DatabaseUtil.java

@@ -47,9 +47,6 @@ public class DatabaseUtil {
    */
   private DatabaseUtil() {}
 
-  /**
-   * Create database.
-   */
   static {
     LOGGER.info("create h2 database");
     var source = new JdbcDataSource();