--- old/src/java.desktop/share/classes/java/awt/desktop/AppEvent.java	2018-12-04 16:22:20.000000000 -0800
+++ new/src/java.desktop/share/classes/java/awt/desktop/AppEvent.java	2018-12-04 16:22:19.000000000 -0800
@@ -38,6 +38,9 @@
  */
 public class AppEvent extends EventObject {
 
+    /**
+     * Use serialVersionUID from JDK 9 for interoperability.
+     */
     private static final long serialVersionUID = -5958503993556009432L;
 
     /**