diff --git a/spring-beans/src/main/java/org/springframework/beans/factory/xml/BeanDefinitionParserDelegate.java b/spring-beans/src/main/java/org/springframework/beans/factory/xml/BeanDefinitionParserDelegate.java
index d8e34b3cbad..4fd5ccdd601 100644
--- a/spring-beans/src/main/java/org/springframework/beans/factory/xml/BeanDefinitionParserDelegate.java
+++ b/spring-beans/src/main/java/org/springframework/beans/factory/xml/BeanDefinitionParserDelegate.java
@@ -643,6 +643,9 @@ public class BeanDefinitionParserDelegate {
 				parentName, className, this.readerContext.getBeanClassLoader());
 	}
 
+	/**
+	 * Parse the meta elements underneath the given element, if any.
+	 */
 	public void parseMetaElements(Element ele, BeanMetadataAttributeAccessor attributeAccessor) {
 		NodeList nl = ele.getChildNodes();
 		for (int i = 0; i < nl.getLength(); i++) {
@@ -658,23 +661,27 @@ public class BeanDefinitionParserDelegate {
 		}
 	}
 
+	/**
+	 * Parse the given autowire attribute value into
+	 * {@link AbstractBeanDefinition} autowire constants.
+	 */
 	@SuppressWarnings("deprecation")
-	public int getAutowireMode(String attValue) {
-		String att = attValue;
-		if (isDefaultValue(att)) {
-			att = this.defaults.getAutowire();
+	public int getAutowireMode(String attrValue) {
+		String attr = attrValue;
+		if (isDefaultValue(attr)) {
+			attr = this.defaults.getAutowire();
 		}
 		int autowire = AbstractBeanDefinition.AUTOWIRE_NO;
-		if (AUTOWIRE_BY_NAME_VALUE.equals(att)) {
+		if (AUTOWIRE_BY_NAME_VALUE.equals(attr)) {
 			autowire = AbstractBeanDefinition.AUTOWIRE_BY_NAME;
 		}
-		else if (AUTOWIRE_BY_TYPE_VALUE.equals(att)) {
+		else if (AUTOWIRE_BY_TYPE_VALUE.equals(attr)) {
 			autowire = AbstractBeanDefinition.AUTOWIRE_BY_TYPE;
 		}
-		else if (AUTOWIRE_CONSTRUCTOR_VALUE.equals(att)) {
+		else if (AUTOWIRE_CONSTRUCTOR_VALUE.equals(attr)) {
 			autowire = AbstractBeanDefinition.AUTOWIRE_CONSTRUCTOR;
 		}
-		else if (AUTOWIRE_AUTODETECT_VALUE.equals(att)) {
+		else if (AUTOWIRE_AUTODETECT_VALUE.equals(attr)) {
 			autowire = AbstractBeanDefinition.AUTOWIRE_AUTODETECT;
 		}
 		// Else leave default value.
@@ -953,6 +960,12 @@ public class BeanDefinitionParserDelegate {
 		}
 	}
 
+	/**
+	 * Parse a value, ref or collection sub-element of a property or
+	 * constructor-arg element.
+	 * @param ele subelement of property element; we don't know which yet
+	 * @param bd the current bean definition (if any)
+	 */
 	@Nullable
 	public Object parsePropertySubElement(Element ele, @Nullable BeanDefinition bd) {
 		return parsePropertySubElement(ele, bd, null);
@@ -962,6 +975,7 @@ public class BeanDefinitionParserDelegate {
 	 * Parse a value, ref or collection sub-element of a property or
 	 * constructor-arg element.
 	 * @param ele subelement of property element; we don't know which yet
+	 * @param bd the current bean definition (if any)
 	 * @param defaultValueType the default type (class name) for any
 	 * {@code <value>} tag that might be created
 	 */
@@ -1347,11 +1361,22 @@ public class BeanDefinitionParserDelegate {
 		return TRUE_VALUE.equals(value);
 	}
 
+	/**
+	 * Parse a custom element (outside of the default namespace).
+	 * @param ele the element to parse
+	 * @return the resulting bean definition
+	 */
 	@Nullable
 	public BeanDefinition parseCustomElement(Element ele) {
 		return parseCustomElement(ele, null);
 	}
 
+	/**
+	 * Parse a custom element (outside of the default namespace).
+	 * @param ele the element to parse
+	 * @param containingBd the containing bean definition (if any)
+	 * @return the resulting bean definition
+	 */
 	@Nullable
 	public BeanDefinition parseCustomElement(Element ele, @Nullable BeanDefinition containingBd) {
 		String namespaceUri = getNamespaceURI(ele);
@@ -1366,14 +1391,27 @@ public class BeanDefinitionParserDelegate {
 		return handler.parse(ele, new ParserContext(this.readerContext, this, containingBd));
 	}
 
-	public BeanDefinitionHolder decorateBeanDefinitionIfRequired(Element ele, BeanDefinitionHolder definitionHolder) {
-		return decorateBeanDefinitionIfRequired(ele, definitionHolder, null);
+	/**
+	 * Decorate the given bean definition through a namespace handler, if applicable.
+	 * @param ele the current element
+	 * @param originalDef the current bean definition
+	 * @return the decorated bean definition
+	 */
+	public BeanDefinitionHolder decorateBeanDefinitionIfRequired(Element ele, BeanDefinitionHolder originalDef) {
+		return decorateBeanDefinitionIfRequired(ele, originalDef, null);
 	}
 
+	/**
+	 * Decorate the given bean definition through a namespace handler, if applicable.
+	 * @param ele the current element
+	 * @param originalDef the current bean definition
+	 * @param containingBd the containing bean definition (if any)
+	 * @return the decorated bean definition
+	 */
 	public BeanDefinitionHolder decorateBeanDefinitionIfRequired(
-			Element ele, BeanDefinitionHolder definitionHolder, @Nullable BeanDefinition containingBd) {
+			Element ele, BeanDefinitionHolder originalDef, @Nullable BeanDefinition containingBd) {
 
-		BeanDefinitionHolder finalDefinition = definitionHolder;
+		BeanDefinitionHolder finalDefinition = originalDef;
 
 		// Decorate based on custom attributes first.
 		NamedNodeMap attributes = ele.getAttributes();
@@ -1393,6 +1431,14 @@ public class BeanDefinitionParserDelegate {
 		return finalDefinition;
 	}
 
+	/**
+	 * Decorate the given bean definition through a namespace handler,
+	 * if applicable.
+	 * @param node the current child node
+	 * @param originalDef the current bean definition
+	 * @param containingBd the containing bean definition (if any)
+	 * @return the decorated bean definition
+	 */
 	public BeanDefinitionHolder decorateIfRequired(
 			Node node, BeanDefinitionHolder originalDef, @Nullable BeanDefinition containingBd) {
 
@@ -1473,10 +1519,16 @@ public class BeanDefinitionParserDelegate {
 		return desiredName.equals(node.getNodeName()) || desiredName.equals(getLocalName(node));
 	}
 
+	/**
+	 * Determine whether the given URI indicates the default namespace.
+	 */
 	public boolean isDefaultNamespace(@Nullable String namespaceUri) {
 		return (!StringUtils.hasLength(namespaceUri) || BEANS_NAMESPACE_URI.equals(namespaceUri));
 	}
 
+	/**
+	 * Determine whether the given node indicates the default namespace.
+	 */
 	public boolean isDefaultNamespace(Node node) {
 		return isDefaultNamespace(getNamespaceURI(node));
 	}
diff --git a/spring-jdbc/src/main/java/org/springframework/jdbc/datasource/TransactionAwareDataSourceProxy.java b/spring-jdbc/src/main/java/org/springframework/jdbc/datasource/TransactionAwareDataSourceProxy.java
index 05e4d36d0d0..97a2fdc9518 100644
--- a/spring-jdbc/src/main/java/org/springframework/jdbc/datasource/TransactionAwareDataSourceProxy.java
+++ b/spring-jdbc/src/main/java/org/springframework/jdbc/datasource/TransactionAwareDataSourceProxy.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -203,6 +203,10 @@ public class TransactionAwareDataSourceProxy extends DelegatingDataSource {
 					return true;
 				}
 			}
+			else if (method.getName().equals("getWarnings") || method.getName().equals("clearWarnings")) {
+				// Avoid creation of target Connection on pre-close cleanup (e.g. in Hibernate Session)
+				return null;
+			}
 			else if (method.getName().equals("close")) {
 				// Handle close method: only close if not within a transaction.
 				DataSourceUtils.doReleaseConnection(this.target, this.targetDataSource);