Fix checkstyle errors

(cherry picked from commit bd98343b9c)

reactive/webflux/java/authentication/username-password/form/src/integTest/java/example/WebfluxFormApplicationITests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package example;
 
 import com.gargoylesoftware.htmlunit.BrowserVersion;