diff --git a/spring-beans/src/main/java/org/springframework/beans/factory/support/BeanDefinitionValueResolver.java b/spring-beans/src/main/java/org/springframework/beans/factory/support/BeanDefinitionValueResolver.java
index 11ee6eef85..d2d0d947d3 100644
--- a/spring-beans/src/main/java/org/springframework/beans/factory/support/BeanDefinitionValueResolver.java
+++ b/spring-beans/src/main/java/org/springframework/beans/factory/support/BeanDefinitionValueResolver.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/CachingResourceResolver.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/CachingResourceResolver.java
index 882504fad0..187dde05c8 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/CachingResourceResolver.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/CachingResourceResolver.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -106,6 +106,7 @@ public class CachingResourceResolver extends AbstractResourceResolver {
 
 
 	@Override
+	@Nullable
 	protected Resource resolveResourceInternal(@Nullable HttpServletRequest request, String requestPath,
 			List<? extends Resource> locations, ResourceResolverChain chain) {
 
@@ -154,6 +155,7 @@ public class CachingResourceResolver extends AbstractResourceResolver {
 	}
 
 	@Override
+	@Nullable
 	protected String resolveUrlPathInternal(String resourceUrlPath,
 			List<? extends Resource> locations, ResourceResolverChain chain) {
 
diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/EncodedResourceResolver.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/EncodedResourceResolver.java
index f45d41c937..fcb3292bb6 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/EncodedResourceResolver.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/EncodedResourceResolver.java
@@ -129,6 +129,7 @@ public class EncodedResourceResolver extends AbstractResourceResolver {
 
 
 	@Override
+	@Nullable
 	protected Resource resolveResourceInternal(@Nullable HttpServletRequest request, String requestPath,
 			List<? extends Resource> locations, ResourceResolverChain chain) {
 
@@ -177,6 +178,7 @@ public class EncodedResourceResolver extends AbstractResourceResolver {
 	}
 
 	@Override
+	@Nullable
 	protected String resolveUrlPathInternal(String resourceUrlPath,
 			List<? extends Resource> locations, ResourceResolverChain chain) {
 
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 1e8509f53f..e93efc46e6 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
@@ -157,6 +157,7 @@ public class VersionResourceResolver extends AbstractResourceResolver {
 
 
 	@Override
+	@Nullable
 	protected Resource resolveResourceInternal(@Nullable HttpServletRequest request, String requestPath,
 			List<? extends Resource> locations, ResourceResolverChain chain) {
 
@@ -195,6 +196,7 @@ public class VersionResourceResolver extends AbstractResourceResolver {
 	}
 
 	@Override
+	@Nullable
 	protected String resolveUrlPathInternal(String resourceUrlPath,
 			List<? extends Resource> locations, ResourceResolverChain chain) {
 
diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/WebJarsResourceResolver.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/WebJarsResourceResolver.java
index e42d9d7085..404ce2e358 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/WebJarsResourceResolver.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/WebJarsResourceResolver.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -74,6 +74,7 @@ public class WebJarsResourceResolver extends AbstractResourceResolver {
 
 
 	@Override
+	@Nullable
 	protected Resource resolveResourceInternal(@Nullable HttpServletRequest request, String requestPath,
 			List<? extends Resource> locations, ResourceResolverChain chain) {
 
@@ -88,6 +89,7 @@ public class WebJarsResourceResolver extends AbstractResourceResolver {
 	}
 
 	@Override
+	@Nullable
 	protected String resolveUrlPathInternal(String resourceUrlPath,
 			List<? extends Resource> locations, ResourceResolverChain chain) {