diff --git a/spring-core/src/main/java/org/springframework/core/io/FileUrlResource.java b/spring-core/src/main/java/org/springframework/core/io/FileUrlResource.java
index 4e1b0fa8093..b910bbc9165 100644
--- a/spring-core/src/main/java/org/springframework/core/io/FileUrlResource.java
+++ b/spring-core/src/main/java/org/springframework/core/io/FileUrlResource.java
@@ -89,15 +89,8 @@ public class FileUrlResource extends UrlResource implements WritableResource {
 	@Override
 	public boolean isWritable() {
 		try {
-			URL url = getURL();
-			if (ResourceUtils.isFileURL(url)) {
-				// Proceed with file system resolution
-				File file = getFile();
-				return (file.canWrite() && !file.isDirectory());
-			}
-			else {
-				return true;
-			}
+			File file = getFile();
+			return (file.canWrite() && !file.isDirectory());
 		}
 		catch (IOException ex) {
 			return false;
diff --git a/spring-web/src/main/java/org/springframework/http/converter/json/AbstractJackson2HttpMessageConverter.java b/spring-web/src/main/java/org/springframework/http/converter/json/AbstractJackson2HttpMessageConverter.java
index d7ce67d4809..9480b46deca 100644
--- a/spring-web/src/main/java/org/springframework/http/converter/json/AbstractJackson2HttpMessageConverter.java
+++ b/spring-web/src/main/java/org/springframework/http/converter/json/AbstractJackson2HttpMessageConverter.java
@@ -286,14 +286,14 @@ public abstract class AbstractJackson2HttpMessageConverter extends AbstractGener
 	}
 
 	/**
-	 * Return the charset to use for JSON input.
+	 * Determine the charset to use for JSON input.
 	 * <p>By default this is either the charset from the input {@code MediaType}
-	 * or otherwise falling back on {@code UTF-8}.
+	 * or otherwise falling back on {@code UTF-8}. Can be overridden in subclasses.
 	 * @param contentType the content type of the HTTP input message
 	 * @return the charset to use
 	 * @since 5.1.18
 	 */
-	protected static Charset getCharset(@Nullable MediaType contentType) {
+	protected Charset getCharset(@Nullable MediaType contentType) {
 		if (contentType != null && contentType.getCharset() != null) {
 			return contentType.getCharset();
 		}