Fix checkstyle errors

(cherry picked from commit bd98343b9c)

servlet/spring-boot/java/oauth2/resource-server/jwe/src/integTest/java/example/OAuth2ResourceServerApplicationITests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package example;
 
 import org.junit.jupiter.api.Test;

servlet/spring-boot/java/oauth2/resource-server/jwe/src/main/java/example/OAuth2ResourceServerApplication.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package example;
 
 import org.springframework.boot.SpringApplication;

servlet/spring-boot/java/oauth2/resource-server/jwe/src/main/java/example/OAuth2ResourceServerController.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package example;
 
 import org.springframework.security.core.annotation.AuthenticationPrincipal;

servlet/spring-boot/java/oauth2/resource-server/jwe/src/main/java/example/OAuth2ResourceServerSecurityConfiguration.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package example;
 
 import java.net.URL;

servlet/spring-boot/java/oauth2/resource-server/jwe/src/main/java/org/springframework/boot/env/package-info.java

@@ -19,4 +19,5 @@
  * {@link org.springframework.core.env.Environment}.
  * @author Rob Winch
  */
+
 package org.springframework.boot.env;