diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/ControllerMethodResolver.java b/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/ControllerMethodResolver.java
index 70e6aa8549..e8ff100c45 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/ControllerMethodResolver.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/ControllerMethodResolver.java
@@ -372,17 +372,7 @@ class ControllerMethodResolver {
 	 */
 	public SessionAttributesHandler getSessionAttributesHandler(HandlerMethod handlerMethod) {
 		Class<?> handlerType = handlerMethod.getBeanType();
-		SessionAttributesHandler result = this.sessionAttributesHandlerCache.get(handlerType);
-		if (result == null) {
-			synchronized (this.sessionAttributesHandlerCache) {
-				result = this.sessionAttributesHandlerCache.get(handlerType);
-				if (result == null) {
-					result = new SessionAttributesHandler(handlerType);
-					this.sessionAttributesHandlerCache.put(handlerType, result);
-				}
-			}
-		}
-		return result;
+		return this.sessionAttributesHandlerCache.computeIfAbsent(handlerType, SessionAttributesHandler::new);
 	}
 
 }