--- a/src/java.base/share/classes/javax/net/ssl/HandshakeCompletedEvent.java	Thu Aug 29 18:52:30 2019 -0400
+++ b/src/java.base/share/classes/javax/net/ssl/HandshakeCompletedEvent.java	Thu Aug 29 16:31:34 2019 -0700
@@ -49,6 +49,7 @@
  */
 public class HandshakeCompletedEvent extends EventObject
 {
+    @java.io.Serial
     private static final long serialVersionUID = 7914963744257769778L;
 
     private transient SSLSession session;