src/java.base/share/classes/sun/net/www/protocol/http/DigestAuthentication.java

@@ -48,10 +48,11 @@
  * @author Bill Foote
  */
 
 class DigestAuthentication extends AuthenticationInfo {
 
+    @java.io.Serial
     private static final long serialVersionUID = 100L;
 
     private String authMethod;
 
     private static final String compatPropName = "http.auth.digest." +