--- old/src/java.base/share/classes/java/net/Inet4Address.java	2019-08-27 17:27:57.726324386 -0700
+++ new/src/java.base/share/classes/java/net/Inet4Address.java	2019-08-27 17:27:57.522324386 -0700
@@ -89,6 +89,7 @@
     /** use serialVersionUID from InetAddress, but Inet4Address instance
      *  is always replaced by an InetAddress instance before being
      *  serialized */
+    @java.io.Serial
     private static final long serialVersionUID = 3286316764910316507L;
 
     /*
@@ -134,6 +135,7 @@
      * @throws ObjectStreamException if a new object replacing this
      * object could not be created
      */
+    @java.io.Serial
     private Object writeReplace() throws ObjectStreamException {
         // will replace the to be serialized 'this' object
         InetAddress inet = new InetAddress();