diff --git a/spring-core/src/main/java/org/springframework/util/xml/TransformerUtils.java b/spring-core/src/main/java/org/springframework/util/xml/TransformerUtils.java
index 5e65536847..42d881490b 100644
--- a/spring-core/src/main/java/org/springframework/util/xml/TransformerUtils.java
+++ b/spring-core/src/main/java/org/springframework/util/xml/TransformerUtils.java
@@ -54,15 +54,15 @@ public abstract class TransformerUtils {
 	 * Enable indenting for the supplied {@link javax.xml.transform.Transformer}.
 	 * <p>If the underlying XSLT engine is Xalan, then the special output key {@code indent-amount}
 	 * will be also be set to a value of {@link #DEFAULT_INDENT_AMOUNT} characters.
-	 * @param transformer  the target transformer
-	 * @param indentAmount the size of the indent (2 characters, 3 characters, etc.)
+	 * @param transformer the target transformer
+	 * @param indentAmount the size of the indent (2 characters, 3 characters, etc)
 	 * @see javax.xml.transform.Transformer#setOutputProperty(String, String)
 	 * @see javax.xml.transform.OutputKeys#INDENT
 	 */
 	public static void enableIndenting(Transformer transformer, int indentAmount) {
 		Assert.notNull(transformer, "Transformer must not be null");
 		if (indentAmount < 0) {
-			throw new IllegalArgumentException("The indent amount cannot be less than zero : got " + indentAmount);
+			throw new IllegalArgumentException("Invalid indent amount (must not be less than zero): " + indentAmount);
 		}
 		transformer.setOutputProperty(OutputKeys.INDENT, "yes");
 		try {
diff --git a/spring-oxm/src/main/java/org/springframework/oxm/jaxb/Jaxb2Marshaller.java b/spring-oxm/src/main/java/org/springframework/oxm/jaxb/Jaxb2Marshaller.java
index f17eee0a34..88f65e0bd5 100644
--- a/spring-oxm/src/main/java/org/springframework/oxm/jaxb/Jaxb2Marshaller.java
+++ b/spring-oxm/src/main/java/org/springframework/oxm/jaxb/Jaxb2Marshaller.java
@@ -555,9 +555,8 @@ public class Jaxb2Marshaller implements MimeMarshaller, MimeUnmarshaller, Generi
 		xmlReader.setFeature("http://xml.org/sax/features/namespace-prefixes", true);
 		for (int i = 0; i < resources.length; i++) {
 			Resource resource = resources[i];
-			Assert.notNull(resource, "Resource is null");
-			if (!resource.exists()) {
-				throw new IllegalArgumentException("Resource " + resource + " does not exist");
+			if (resource == null || !resource.exists()) {
+				throw new IllegalArgumentException("Resource does not exist: " + resource);
 			}
 			InputSource inputSource = SaxResourceUtils.createInputSource(resource);
 			schemaSources[i] = new SAXSource(xmlReader, inputSource);
@@ -572,8 +571,8 @@ public class Jaxb2Marshaller implements MimeMarshaller, MimeUnmarshaller, Generi
 
 	@Override
 	public boolean supports(Class<?> clazz) {
-		return ((this.supportJaxbElementClass && JAXBElement.class.isAssignableFrom(clazz)) ||
-				supportsInternal(clazz, this.checkForXmlRootElement));
+		return (this.supportJaxbElementClass && JAXBElement.class.isAssignableFrom(clazz)) ||
+				supportsInternal(clazz, this.checkForXmlRootElement);
 	}
 
 	@Override