Fix checkstyle errors

src/Client/src/main/java/greenify/client/Application.java

@@ -26,16 +26,11 @@ public class Application extends javafx.application.Application {
      * @param url which is being loaded.
      * @return parent object.
      */
-     public static Parent load(java.net.URL url) {
+    public static Parent load(java.net.URL url) throws IOException {
         FXMLLoader loader = new FXMLLoader();
         loader.setControllerFactory(springContext::getBean);
         loader.setLocation(url);
-        try {
-            return loader.load();
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-        return null;
+        return loader.load();
     }
 
     @Override

src/Common/src/main/java/greenify/common/UserDTO.java

@@ -5,7 +5,6 @@ package greenify.common;
 // The motivation for its use is that communication between processes is usually done
 // resorting to remote interfaces (e.g., web services), where each call is an expensive operation.
 public class UserDto {
-
     private Long id;
     private String name;
 

src/Common/src/test/java/ErrorResponseTest.java

@@ -1,9 +1,10 @@
-import greenify.common.ErrorResponse;
-import org.junit.Test;
-
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
+import greenify.common.ErrorResponse;
+
+import org.junit.Test;
+
 public class ErrorResponseTest {
     @Test
     public void setAndGetTest() {

src/Common/src/test/java/UserDTOTest.java

@@ -1,9 +1,9 @@
-import greenify.common.UserDto;
-import org.junit.Test;
-
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
+import greenify.common.UserDto;
+import org.junit.Test;
+
 public class UserDtoTest {
     @Test
     public void setAndGetTest() {