--- old/src/java.desktop/share/classes/java/awt/desktop/PrintFilesEvent.java	2018-12-04 16:22:41.000000000 -0800
+++ new/src/java.desktop/share/classes/java/awt/desktop/PrintFilesEvent.java	2018-12-04 16:22:41.000000000 -0800
@@ -39,6 +39,9 @@
  */
 public final class PrintFilesEvent extends FilesEvent {
 
+    /**
+     * Use serialVersionUID from JDK 9 for interoperability.
+     */
     private static final long serialVersionUID = -5752560876153618618L;
 
     /**