diff --git a/spring-test/src/main/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilder.java b/spring-test/src/main/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilder.java
index 7bab3e442f..763be2d527 100644
--- a/spring-test/src/main/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilder.java
+++ b/spring-test/src/main/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilder.java
@@ -441,20 +441,19 @@ final class HtmlUnitRequestBuilder implements RequestBuilder, Mergeable {
 
 	@Override
 	public Object merge(Object parent) {
-		if (parent == null) {
-			return this;
+		if (parent instanceof RequestBuilder) {
+			if (parent instanceof MockHttpServletRequestBuilder) {
+				MockHttpServletRequestBuilder copiedParent = MockMvcRequestBuilders.get("/");
+				copiedParent.merge(parent);
+				this.parentBuilder = copiedParent;
+			}
+			else {
+				this.parentBuilder = (RequestBuilder) parent;
+			}
+			if (parent instanceof SmartRequestBuilder) {
+				this.parentPostProcessor = (SmartRequestBuilder) parent;
+			}
 		}
-		if (parent instanceof MockHttpServletRequestBuilder) {
-			MockHttpServletRequestBuilder copiedParent = MockMvcRequestBuilders.get("/");
-			copiedParent.merge(parent);
-			this.parentBuilder = copiedParent;
-		} else if (parent instanceof RequestBuilder) {
-			this.parentBuilder = (RequestBuilder) parent;
-		}
-		if (parent instanceof SmartRequestBuilder) {
-			this.parentPostProcessor = (SmartRequestBuilder) parent;
-		}
-
 		return this;
 	}
 
diff --git a/spring-tx/src/main/java/org/springframework/transaction/event/ApplicationListenerMethodTransactionalAdapter.java b/spring-tx/src/main/java/org/springframework/transaction/event/ApplicationListenerMethodTransactionalAdapter.java
index 5998522c69..a33b07bc63 100644
--- a/spring-tx/src/main/java/org/springframework/transaction/event/ApplicationListenerMethodTransactionalAdapter.java
+++ b/spring-tx/src/main/java/org/springframework/transaction/event/ApplicationListenerMethodTransactionalAdapter.java
@@ -32,10 +32,10 @@ import org.springframework.transaction.support.TransactionSynchronizationManager
  * an event to a {@link TransactionalEventListener} annotated method. Supports
  * the exact same features as any regular {@link EventListener} annotated method
  * but is aware of the transactional context of the event publisher.
- * <p>
- * Processing of {@link TransactionalEventListener} is enabled automatically when
- * Spring's transaction management is enabled. For other cases, registering a
- * bean of type {@link TransactionalEventListenerFactory} is required.
+ *
+ * <p>Processing of {@link TransactionalEventListener} is enabled automatically
+ * when Spring's transaction management is enabled. For other cases, registering
+ * a bean of type {@link TransactionalEventListenerFactory} is required.
  *
  * @author Stephane Nicoll
  * @author Juergen Hoeller
@@ -69,8 +69,11 @@ class ApplicationListenerMethodTransactionalAdapter extends ApplicationListenerM
 			}
 			processEvent(event);
 		}
-		else if (logger.isDebugEnabled()) {
-			logger.debug("No transaction is running - skipping " + event);
+		else {
+			// No transactional event execution at all
+			if (logger.isDebugEnabled()) {
+				logger.debug("No transaction is active - skipping " + event);
+			}
 		}
 	}
 
diff --git a/spring-web/src/main/java/org/springframework/http/HttpRange.java b/spring-web/src/main/java/org/springframework/http/HttpRange.java
index e3dbb8ca16..c11a57a008 100644
--- a/spring-web/src/main/java/org/springframework/http/HttpRange.java
+++ b/spring-web/src/main/java/org/springframework/http/HttpRange.java
@@ -56,8 +56,8 @@ public abstract class HttpRange {
 	public ResourceRegion toResourceRegion(Resource resource) {
 		// Don't try to determine contentLength on InputStreamResource - cannot be read afterwards...
 		// Note: custom InputStreamResource subclasses could provide a pre-calculated content length!
-		Assert.isTrue(InputStreamResource.class != resource.getClass(),
-				"Can't convert an InputStreamResource to a ResourceRegion");
+		Assert.isTrue(resource.getClass() != InputStreamResource.class,
+				"Cannot convert an InputStreamResource to a ResourceRegion");
 		try {
 			long contentLength = resource.contentLength();
 			Assert.isTrue(contentLength > 0, "Resource content length should be > 0");
@@ -163,12 +163,12 @@ public abstract class HttpRange {
 	}
 
 	/**
-	 * Convert each {@code HttpRange} into a {@code ResourceRegion},
-	 * selecting the appropriate segment of the given {@code Resource}
-	 * using the HTTP Range information.
+	 * Convert each {@code HttpRange} into a {@code ResourceRegion}, selecting the
+	 * appropriate segment of the given {@code Resource} using HTTP Range information.
 	 * @param ranges the list of ranges
 	 * @param resource the resource to select the regions from
 	 * @return the list of regions for the given resource
+	 * @since 4.3
 	 */
 	public static List<ResourceRegion> toResourceRegions(List<HttpRange> ranges, Resource resource) {
 		if (CollectionUtils.isEmpty(ranges)) {
diff --git a/spring-web/src/main/java/org/springframework/http/MediaType.java b/spring-web/src/main/java/org/springframework/http/MediaType.java
index 3fad7788bb..f2ffba68b5 100644
--- a/spring-web/src/main/java/org/springframework/http/MediaType.java
+++ b/spring-web/src/main/java/org/springframework/http/MediaType.java
@@ -113,11 +113,13 @@ public class MediaType extends MimeType implements Serializable {
 
 	/**
 	 * Public constant media type for {@code application/pdf}.
+	 * @since 4.3
 	 */
 	public final static MediaType APPLICATION_PDF;
 
 	/**
 	 * A String equivalent of {@link MediaType#APPLICATION_PDF}.
+	 * @since 4.3
 	 */
 	public final static String APPLICATION_PDF_VALUE = "application/pdf";
 
@@ -193,11 +195,13 @@ public class MediaType extends MimeType implements Serializable {
 
 	/**
 	 * Public constant media type for {@code text/markdown}.
+	 * @since 4.3
 	 */
 	public final static MediaType TEXT_MARKDOWN;
 
 	/**
 	 * A String equivalent of {@link MediaType#TEXT_MARKDOWN}.
+	 * @since 4.3
 	 */
 	public final static String TEXT_MARKDOWN_VALUE = "text/markdown";
 
@@ -295,6 +299,7 @@ public class MediaType extends MimeType implements Serializable {
 	 * @param other the other media type
 	 * @param charset the character set
 	 * @throws IllegalArgumentException if any of the parameters contain illegal characters
+	 * @since 4.3
 	 */
 	public MediaType(MediaType other, Charset charset) {
 		super(other, charset);
diff --git a/spring-websocket/src/main/java/org/springframework/web/socket/WebSocketExtension.java b/spring-websocket/src/main/java/org/springframework/web/socket/WebSocketExtension.java
index 817371c163..e43a1d2a82 100644
--- a/spring-websocket/src/main/java/org/springframework/web/socket/WebSocketExtension.java
+++ b/spring-websocket/src/main/java/org/springframework/web/socket/WebSocketExtension.java
@@ -139,7 +139,7 @@ public class WebSocketExtension {
 		if (StringUtils.hasText(extensions)) {
 			String[] tokens = StringUtils.tokenizeToStringArray(extensions, ",");
 			List<WebSocketExtension> result = new ArrayList<WebSocketExtension>(tokens.length);
-			for (String token : StringUtils.tokenizeToStringArray(extensions, ",")) {
+			for (String token : tokens) {
 				result.add(parseExtension(token));
 			}
 			return result;