--- old/src/java.base/share/classes/java/lang/UnsupportedClassVersionError.java	2019-08-27 17:27:41.122324386 -0700
+++ new/src/java.base/share/classes/java/lang/UnsupportedClassVersionError.java	2019-08-27 17:27:40.918324386 -0700
@@ -34,6 +34,7 @@
  */
 public
 class UnsupportedClassVersionError extends ClassFormatError {
+    @java.io.Serial
     private static final long serialVersionUID = -7123279212883497373L;
 
     /**