--- old/src/java.base/share/classes/java/lang/ClassFormatError.java	2019-08-27 17:27:06.338324386 -0700
+++ new/src/java.base/share/classes/java/lang/ClassFormatError.java	2019-08-27 17:27:06.070324386 -0700
@@ -35,6 +35,7 @@
  */
 public
 class ClassFormatError extends LinkageError {
+    @java.io.Serial
     private static final long serialVersionUID = -8420114879011949195L;
 
     /**