DATACMNS-1240 - Update copyright years to 2018.

Also, remove some trailing whitespaces and align outdated license header format.

src/main/java/org/springframework/data/transaction/ChainedTransactionManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2013 the original author or authors.
+ * Copyright 2011-2018 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.
@@ -44,7 +44,7 @@ import org.springframework.util.Assert;
  * which means the {@link PlatformTransactionManager} most likely to break the transaction should be the <em>last</em>
  * in the list configured. A {@link PlatformTransactionManager} throwing an exception during commit will automatically
  * cause the remaining transaction managers to roll back instead of committing.
- * 
+ *
  * @author Michael Hunger
  * @author Oliver Gierke
  * @since 1.6
@@ -58,7 +58,7 @@ public class ChainedTransactionManager implements PlatformTransactionManager {
 
 	/**
 	 * Creates a new {@link ChainedTransactionManager} delegating to the given {@link PlatformTransactionManager}s.
-	 * 
+	 *
 	 * @param transactionManagers must not be {@literal null} or empty.
 	 */
 	public ChainedTransactionManager(PlatformTransactionManager... transactionManagers) {
@@ -68,7 +68,7 @@ public class ChainedTransactionManager implements PlatformTransactionManager {
 	/**
 	 * Creates a new {@link ChainedTransactionManager} using the given {@link SynchronizationManager} and
 	 * {@link PlatformTransactionManager}s.
-	 * 
+	 *
 	 * @param synchronizationManager must not be {@literal null}.
 	 * @param transactionManagers must not be {@literal null} or empty.
 	 */

src/main/java/org/springframework/data/transaction/MultiTransactionStatus.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2017 the original author or authors.
+ * Copyright 2011-2018 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.
@@ -28,7 +28,7 @@ import org.springframework.util.Assert;
 /**
  * {@link TransactionStatus} implementation to orchestrate {@link TransactionStatus} instances for multiple
  * {@link PlatformTransactionManager} instances.
- * 
+ *
  * @author Michael Hunger
  * @author Oliver Gierke
  * @author Christoph Strobl
@@ -44,7 +44,7 @@ class MultiTransactionStatus implements TransactionStatus {
 
 	/**
 	 * Creates a new {@link MultiTransactionStatus} for the given {@link PlatformTransactionManager}.
-	 * 
+	 *
 	 * @param mainTransactionManager must not be {@literal null}.
 	 */
 	public MultiTransactionStatus(PlatformTransactionManager mainTransactionManager) {
@@ -76,7 +76,7 @@ class MultiTransactionStatus implements TransactionStatus {
 
 	/**
 	 * Rolls back the {@link TransactionStatus} registered for the given {@link PlatformTransactionManager}.
-	 * 
+	 *
 	 * @param transactionManager must not be {@literal null}.
 	 */
 	public void rollback(PlatformTransactionManager transactionManager) {

src/main/java/org/springframework/data/transaction/SpringTransactionSynchronizationManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2013 the original author or authors.
+ * Copyright 2011-2018 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.
@@ -19,7 +19,7 @@ import org.springframework.transaction.support.TransactionSynchronizationManager
 
 /**
  * {@link SynchronizationManager} delegating calls to Spring's {@link TransactionSynchronizationManager}.
- * 
+ *
  * @author Michael Hunger
  * @author Oliver Gierke
  * @since 1.6

src/main/java/org/springframework/data/transaction/SynchronizationManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2013 the original author or authors.
+ * Copyright 2011-2018 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.
@@ -18,7 +18,7 @@ package org.springframework.data.transaction;
 
 /**
  * Strategy interface to allow providing a dedicated synchronization mechanism.
- * 
+ *
  * @author Michael Hunger
  * @author Oliver Gierke
  * @see SpringTransactionSynchronizationManager