diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/PathResourceResolver.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/PathResourceResolver.java
index d46394e9d01..bcce0d6379b 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/PathResourceResolver.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/PathResourceResolver.java
@@ -133,6 +133,7 @@ public class PathResourceResolver extends AbstractResourceResolver {
 
 
 	@Override
+	@Nullable
 	protected Resource resolveResourceInternal(@Nullable HttpServletRequest request, String requestPath,
 			List<? extends Resource> locations, ResourceResolverChain chain) {
 
@@ -140,6 +141,7 @@ public class PathResourceResolver extends AbstractResourceResolver {
 	}
 
 	@Override
+	@Nullable
 	protected String resolveUrlPathInternal(String resourcePath, List<? extends Resource> locations,
 			ResourceResolverChain chain) {