--- old/src/java.base/share/classes/sun/net/www/protocol/http/DigestAuthentication.java	2019-08-27 17:29:33.850324386 -0700
+++ new/src/java.base/share/classes/sun/net/www/protocol/http/DigestAuthentication.java	2019-08-27 17:29:33.658324386 -0700
@@ -50,6 +50,7 @@
 
 class DigestAuthentication extends AuthenticationInfo {
 
+    @java.io.Serial
     private static final long serialVersionUID = 100L;
 
     private String authMethod;