diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/function/server/PathResourceLookupFunction.java b/spring-webflux/src/main/java/org/springframework/web/reactive/function/server/PathResourceLookupFunction.java
index d725a1e6aab1..22798eda937d 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/function/server/PathResourceLookupFunction.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/function/server/PathResourceLookupFunction.java
@@ -18,6 +18,7 @@
 
 import java.io.IOException;
 import java.io.UncheckedIOException;
+import java.io.UnsupportedEncodingException;
 import java.net.URLDecoder;
 import java.nio.charset.StandardCharsets;
 import java.util.function.Function;
@@ -171,7 +172,7 @@ private boolean isInvalidEncodedInputPath(String path) {
 		if (path.contains("%")) {
 			try {
 				// Use URLDecoder (vs UriUtils) to preserve potentially decoded UTF-8 chars
-				String decodedPath = URLDecoder.decode(path, StandardCharsets.UTF_8);
+				String decodedPath = URLDecoder.decode(path, "UTF-8");
 				if (isInvalidPath(decodedPath)) {
 					return true;
 				}
@@ -180,7 +181,7 @@ private boolean isInvalidEncodedInputPath(String path) {
 					return true;
 				}
 			}
-			catch (IllegalArgumentException ex) {
+			catch (IllegalArgumentException | UnsupportedEncodingException ex) {
 				// May not be possible to decode...
 			}
 		}
@@ -199,8 +200,8 @@ private boolean isResourceUnderLocation(Resource resource) throws IOException {
 			resourcePath = resource.getURL().toExternalForm();
 			locationPath = StringUtils.cleanPath(this.location.getURL().toString());
 		}
-		else if (resource instanceof ClassPathResource classPathResource) {
-			resourcePath = classPathResource.getPath();
+		else if (resource instanceof ClassPathResource) {
+			resourcePath = ((ClassPathResource) resource).getPath();
 			locationPath = StringUtils.cleanPath(((ClassPathResource) this.location).getPath());
 		}
 		else {
@@ -219,12 +220,12 @@ private boolean isInvalidEncodedResourcePath(String resourcePath) {
 		if (resourcePath.contains("%")) {
 			// Use URLDecoder (vs UriUtils) to preserve potentially decoded UTF-8 chars...
 			try {
-				String decodedPath = URLDecoder.decode(resourcePath, StandardCharsets.UTF_8);
+				String decodedPath = URLDecoder.decode(resourcePath, "UTF-8");
 				if (decodedPath.contains("../") || decodedPath.contains("..\\")) {
 					return true;
 				}
 			}
-			catch (IllegalArgumentException ex) {
+			catch (IllegalArgumentException | UnsupportedEncodingException ex) {
 				// May not be possible to decode...
 			}
 		}
diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/function/PathResourceLookupFunction.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/function/PathResourceLookupFunction.java
index 82557b1c0fbd..83b4f8fe43fe 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/function/PathResourceLookupFunction.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/function/PathResourceLookupFunction.java
@@ -18,6 +18,7 @@
 
 import java.io.IOException;
 import java.io.UncheckedIOException;
+import java.io.UnsupportedEncodingException;
 import java.net.URLDecoder;
 import java.nio.charset.StandardCharsets;
 import java.util.Optional;
@@ -164,7 +165,7 @@ private boolean isInvalidEncodedInputPath(String path) {
 		if (path.contains("%")) {
 			try {
 				// Use URLDecoder (vs UriUtils) to preserve potentially decoded UTF-8 chars
-				String decodedPath = URLDecoder.decode(path, StandardCharsets.UTF_8);
+				String decodedPath = URLDecoder.decode(path, "UTF-8");
 				if (isInvalidPath(decodedPath)) {
 					return true;
 				}
@@ -173,7 +174,7 @@ private boolean isInvalidEncodedInputPath(String path) {
 					return true;
 				}
 			}
-			catch (IllegalArgumentException ex) {
+			catch (IllegalArgumentException | UnsupportedEncodingException ex) {
 				// May not be possible to decode...
 			}
 		}
@@ -196,8 +197,8 @@ else if (resource instanceof ClassPathResource) {
 			resourcePath = ((ClassPathResource) resource).getPath();
 			locationPath = StringUtils.cleanPath(((ClassPathResource) this.location).getPath());
 		}
-		else if (resource instanceof ServletContextResource servletContextResource) {
-			resourcePath = servletContextResource.getPath();
+		else if (resource instanceof ServletContextResource) {
+			resourcePath = ((ServletContextResource) resource).getPath();
 			locationPath = StringUtils.cleanPath(((ServletContextResource) this.location).getPath());
 		}
 		else {
@@ -216,12 +217,12 @@ private boolean isInvalidEncodedResourcePath(String resourcePath) {
 		if (resourcePath.contains("%")) {
 			// Use URLDecoder (vs UriUtils) to preserve potentially decoded UTF-8 chars...
 			try {
-				String decodedPath = URLDecoder.decode(resourcePath, StandardCharsets.UTF_8);
+				String decodedPath = URLDecoder.decode(resourcePath, "UTF-8");
 				if (decodedPath.contains("../") || decodedPath.contains("..\\")) {
 					return true;
 				}
 			}
-			catch (IllegalArgumentException ex) {
+			catch (IllegalArgumentException | UnsupportedEncodingException ex) {
 				// May not be possible to decode...
 			}
 		}