--- old/src/java.base/share/classes/java/lang/invoke/StringConcatException.java	2019-08-27 17:27:46.710324386 -0700
+++ new/src/java.base/share/classes/java/lang/invoke/StringConcatException.java	2019-08-27 17:27:46.538324386 -0700
@@ -32,6 +32,7 @@
  * @since 9
  */
 public class StringConcatException extends Exception {
+    @java.io.Serial
     private static final long serialVersionUID = 292L + 9L;
 
     /**