diff --git a/spring-beans/src/main/java/org/springframework/beans/factory/xml/DefaultNamespaceHandlerResolver.java b/spring-beans/src/main/java/org/springframework/beans/factory/xml/DefaultNamespaceHandlerResolver.java
index 665b4d410b6..45045c8473b 100644
--- a/spring-beans/src/main/java/org/springframework/beans/factory/xml/DefaultNamespaceHandlerResolver.java
+++ b/spring-beans/src/main/java/org/springframework/beans/factory/xml/DefaultNamespaceHandlerResolver.java
@@ -165,9 +165,8 @@ public class DefaultNamespaceHandlerResolver implements NamespaceHandlerResolver
 						if (logger.isDebugEnabled()) {
 							logger.debug("Loaded NamespaceHandler mappings: " + mappings);
 						}
-						Map<String, Object> mappingsToUse = new ConcurrentHashMap<>(mappings.size());
-						CollectionUtils.mergePropertiesIntoMap(mappings, mappingsToUse);
-						handlerMappings = mappingsToUse;
+						handlerMappings = new ConcurrentHashMap<>(mappings.size());
+						CollectionUtils.mergePropertiesIntoMap(mappings, handlerMappings);
 						this.handlerMappings = handlerMappings;
 					}
 					catch (IOException ex) {
diff --git a/spring-beans/src/main/java/org/springframework/beans/factory/xml/PluggableSchemaResolver.java b/spring-beans/src/main/java/org/springframework/beans/factory/xml/PluggableSchemaResolver.java
index 7ad748ebc5a..3fed99e2608 100644
--- a/spring-beans/src/main/java/org/springframework/beans/factory/xml/PluggableSchemaResolver.java
+++ b/spring-beans/src/main/java/org/springframework/beans/factory/xml/PluggableSchemaResolver.java
@@ -152,9 +152,8 @@ public class PluggableSchemaResolver implements EntityResolver {
 						if (logger.isDebugEnabled()) {
 							logger.debug("Loaded schema mappings: " + mappings);
 						}
-						Map<String, String> mappingsToUse = new ConcurrentHashMap<>(mappings.size());
-						CollectionUtils.mergePropertiesIntoMap(mappings, mappingsToUse);
-						schemaMappings = mappingsToUse;
+						schemaMappings = new ConcurrentHashMap<>(mappings.size());
+						CollectionUtils.mergePropertiesIntoMap(mappings, schemaMappings);
 						this.schemaMappings = schemaMappings;
 					}
 					catch (IOException ex) {
diff --git a/spring-beans/src/main/java/org/springframework/beans/factory/xml/XmlBeanDefinitionReader.java b/spring-beans/src/main/java/org/springframework/beans/factory/xml/XmlBeanDefinitionReader.java
index 1166461dd18..ee0952dac0f 100644
--- a/spring-beans/src/main/java/org/springframework/beans/factory/xml/XmlBeanDefinitionReader.java
+++ b/spring-beans/src/main/java/org/springframework/beans/factory/xml/XmlBeanDefinitionReader.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -431,11 +431,12 @@ public class XmlBeanDefinitionReader extends AbstractBeanDefinitionReader {
 	}
 
 	/**
-	 * Get the validation mode for the specified {@link Resource}. If no explicit
-	 * validation mode has been configured then the validation mode is
-	 * {@link #detectValidationMode detected}.
+	 * Determine the validation mode for the specified {@link Resource}.
+	 * If no explicit validation mode has been configured, then the validation
+	 * mode gets {@link #detectValidationMode detected} from the given resource.
 	 * <p>Override this method if you would like full control over the validation
 	 * mode, even when something other than {@link #VALIDATION_AUTO} was set.
+	 * @see #detectValidationMode
 	 */
 	protected int getValidationModeForResource(Resource resource) {
 		int validationModeToUse = getValidationMode();
@@ -539,7 +540,8 @@ public class XmlBeanDefinitionReader extends AbstractBeanDefinitionReader {
 
 	/**
 	 * Create the default implementation of {@link NamespaceHandlerResolver} used if none is specified.
-	 * Default implementation returns an instance of {@link DefaultNamespaceHandlerResolver}.
+	 * <p>The default implementation returns an instance of {@link DefaultNamespaceHandlerResolver}.
+	 * @see DefaultNamespaceHandlerResolver#DefaultNamespaceHandlerResolver(ClassLoader)
 	 */
 	protected NamespaceHandlerResolver createDefaultNamespaceHandlerResolver() {
 		ClassLoader cl = (getResourceLoader() != null ? getResourceLoader().getClassLoader() : getBeanClassLoader());