src/java.base/share/classes/javax/net/ssl/HandshakeCompletedEvent.java

@@ -47,10 +47,11 @@
  * @since 1.4
  * @author David Brownell
  */
 public class HandshakeCompletedEvent extends EventObject
 {
+    @java.io.Serial
     private static final long serialVersionUID = 7914963744257769778L;
 
     private transient SSLSession session;
 
     /**