diff --git a/spring-test/src/main/java/org/springframework/test/web/servlet/request/MockHttpServletRequestBuilder.java b/spring-test/src/main/java/org/springframework/test/web/servlet/request/MockHttpServletRequestBuilder.java
index e02986e07b..1663bd2fb5 100644
--- a/spring-test/src/main/java/org/springframework/test/web/servlet/request/MockHttpServletRequestBuilder.java
+++ b/spring-test/src/main/java/org/springframework/test/web/servlet/request/MockHttpServletRequestBuilder.java
@@ -142,7 +142,7 @@ public class MockHttpServletRequestBuilder
 
 	/**
 	 * Add a request parameter to the {@link MockHttpServletRequest}.
-	 * If called more than once, the new values are added.
+	 * <p>If called more than once, new values get added to existing ones.
 	 * @param name the parameter name
 	 * @param values one or more values
 	 */
@@ -152,10 +152,11 @@ public class MockHttpServletRequestBuilder
 	}
 
 	/**
-	 * Add request parameters to the {@link MockHttpServletRequest} for example
-	 * such as when testing a form submission. If called more than once, the new
-	 * values are added.
+	 * Add a map of request parameters to the {@link MockHttpServletRequest},
+	 * for example when testing a form submission.
+	 * <p>If called more than once, new values get added to existing ones.
 	 * @param params the parameters to add
+	 * @since 4.2.4
 	 */
 	public MockHttpServletRequestBuilder params(MultiValueMap<String, String> params) {
 		for (String name : params.keySet()) {
@@ -300,7 +301,7 @@ public class MockHttpServletRequestBuilder
 	 * @param value the attribute value
 	 */
 	public MockHttpServletRequestBuilder requestAttr(String name, Object value) {
-		addAttributeToMap(this.attributes, name, value);
+		addToMap(this.attributes, name, value);
 		return this;
 	}
 
@@ -310,7 +311,7 @@ public class MockHttpServletRequestBuilder
 	 * @param value the session attribute value
 	 */
 	public MockHttpServletRequestBuilder sessionAttr(String name, Object value) {
-		addAttributeToMap(this.sessionAttributes, name, value);
+		addToMap(this.sessionAttributes, name, value);
 		return this;
 	}
 
@@ -332,7 +333,7 @@ public class MockHttpServletRequestBuilder
 	 * @param value the flash attribute value
 	 */
 	public MockHttpServletRequestBuilder flashAttr(String name, Object value) {
-		addAttributeToMap(this.flashAttributes, name, value);
+		addToMap(this.flashAttributes, name, value);
 		return this;
 	}
 
@@ -712,19 +713,19 @@ public class MockHttpServletRequestBuilder
 		return request;
 	}
 
+
+	private static void addToMap(Map<String, Object> map, String name, Object value) {
+		Assert.hasLength(name, "'name' must not be empty");
+		Assert.notNull(value, "'value' must not be null");
+		map.put(name, value);
+	}
+
 	private static <T> void addToMultiValueMap(MultiValueMap<String, T> map, String name, T[] values) {
 		Assert.hasLength(name, "'name' must not be empty");
-		Assert.notNull(values, "'values' is required");
 		Assert.notEmpty(values, "'values' must not be empty");
 		for (T value : values) {
 			map.add(name, value);
 		}
 	}
 
-	private static void addAttributeToMap(Map<String, Object> map, String name, Object value) {
-		Assert.hasLength(name, "'name' must not be empty");
-		Assert.notNull(value, "'value' must not be null");
-		map.put(name, value);
-	}
-
 }
diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/ResourceUrlProvider.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/ResourceUrlProvider.java
index b8e9f73d6f..5537a48cdc 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/ResourceUrlProvider.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/ResourceUrlProvider.java
@@ -165,7 +165,7 @@ public class ResourceUrlProvider implements ApplicationListener<ContextRefreshed
 	 * URL path to expose for public use.
 	 * @param request the current request
 	 * @param requestUrl the request URL path to resolve
-	 * @return the resolved public URL path or {@code null} if unresolved
+	 * @return the resolved public URL path, or {@code null} if unresolved
 	 */
 	public final String getForRequestUrl(HttpServletRequest request, String requestUrl) {
 		if (logger.isTraceEnabled()) {
@@ -177,7 +177,7 @@ public class ResourceUrlProvider implements ApplicationListener<ContextRefreshed
 		String suffix = requestUrl.substring(suffixIndex);
 		String lookupPath = requestUrl.substring(prefixIndex, suffixIndex);
 		String resolvedLookupPath = getForLookupPath(lookupPath);
-		return (resolvedLookupPath != null) ? prefix + resolvedLookupPath + suffix : null;
+		return (resolvedLookupPath != null ? prefix + resolvedLookupPath + suffix : null);
 	}
 
 	private int getLookupPathIndex(HttpServletRequest request) {
diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/VersionResourceResolver.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/VersionResourceResolver.java
index 72b03ceb64..a1ed221dd2 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/VersionResourceResolver.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/VersionResourceResolver.java
@@ -168,7 +168,7 @@ public class VersionResourceResolver extends AbstractResourceResolver {
 		String actualVersion = versionStrategy.getResourceVersion(baseResource);
 		if (candidateVersion.equals(actualVersion)) {
 			if (logger.isTraceEnabled()) {
-				logger.trace("Resource matches extracted version: "+ candidateVersion);
+				logger.trace("Resource matches extracted version ["+ candidateVersion + "]");
 			}
 			if (request != null) {
 				request.setAttribute(RESOURCE_VERSION_ATTRIBUTE, candidateVersion);