Fix checkstyle errors

Issue gh-312

servlet/spring-boot/java/authentication/one-time-token/magic-link/src/main/java/org/example/magiclink/MagicLinkGeneratedOneTimeTokenHandler.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package org.example.magiclink;
 
 import java.io.IOException;

servlet/spring-boot/java/authentication/one-time-token/magic-link/src/main/java/org/example/magiclink/MailSender.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package org.example.magiclink;
 
 import org.springframework.mail.SimpleMailMessage;

servlet/spring-boot/java/authentication/one-time-token/magic-link/src/test/java/org/example/magiclink/MagicLinkApplicationTests.java

@@ -16,10 +16,10 @@
 
 package org.example.magiclink;
 
-import jakarta.mail.internet.MimeMessage;
 import com.icegreen.greenmail.junit5.GreenMailExtension;
 import com.icegreen.greenmail.util.GreenMailUtil;
 import com.icegreen.greenmail.util.ServerSetupTest;
+import jakarta.mail.internet.MimeMessage;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;