Nullability refinements

(cherry picked from commit f31933e67e)

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/MvcUriComponentsBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -718,7 +718,7 @@ public class MvcUriComponentsBuilder {
 
 		@Override
 		@Nullable
-		public Object intercept(Object obj, Method method, Object[] args, @Nullable MethodProxy proxy) {
+		public Object intercept(@Nullable Object obj, Method method, Object[] args, @Nullable MethodProxy proxy) {
 			if (method.getName().equals("getControllerType")) {
 				return this.controllerType;
 			}