DATACMNS-831 - Polishing.

Formatting. Fixed copyright header and author. Added missing assertions in AbstractMappingContext.addPersistentEntity(…).

Original pull request: #157.

src/main/java/org/springframework/data/mapping/context/AbstractMappingContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2015 by the original author(s).
+ * Copyright 2011-2016 by the original author(s).
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -62,6 +62,7 @@ import org.springframework.util.StringUtils;
  * @author Michael Hunger
  * @author Thomas Darimont
  * @author Tomasz Wysocki
+ * @author Mikael Klamra
  */
 public abstract class AbstractMappingContext<E extends MutablePersistentEntity<?, P>, P extends PersistentProperty<P>>
 		implements MappingContext<E, P>, ApplicationEventPublisherAware, InitializingBean {
@@ -268,8 +269,8 @@ public abstract class AbstractMappingContext<E extends MutablePersistentEntity<?
 
 	/**
 	 * Adds the given type to the {@link MappingContext}.
-	 * 
-	 * @param type
+	 *
+	 * @param type must not be {@literal null}.
 	 * @return
 	 */
 	protected E addPersistentEntity(Class<?> type) {
@@ -278,14 +279,18 @@ public abstract class AbstractMappingContext<E extends MutablePersistentEntity<?
 
 	/**
 	 * Adds the given {@link TypeInformation} to the {@link MappingContext}.
-	 * 
-	 * @param typeInformation
+	 *
+	 * @param typeInformation must not be {@literal null}.
 	 * @return
 	 */
 	protected E addPersistentEntity(TypeInformation<?> typeInformation) {
-		
+
+		Assert.notNull(typeInformation, "TypeInformation must not be null!");
+
 		try {
+
 			read.lock();
+
 			E persistentEntity = persistentEntities.get(typeInformation);
 
 			if (persistentEntity != null) {