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

*** 48,57 ****
--- 48,58 ----
   * @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." +