--- old/src/java.base/share/classes/java/lang/IllegalMonitorStateException.java	2019-08-27 17:27:16.358324386 -0700
+++ new/src/java.base/share/classes/java/lang/IllegalMonitorStateException.java	2019-08-27 17:27:16.070324386 -0700
@@ -40,6 +40,7 @@
  */
 public
 class IllegalMonitorStateException extends RuntimeException {
+    @java.io.Serial
     private static final long serialVersionUID = 3713306369498869069L;
 
     /**