--- old/src/java.base/share/classes/java/lang/IllegalThreadStateException.java	2019-08-27 17:27:17.850324386 -0700
+++ new/src/java.base/share/classes/java/lang/IllegalThreadStateException.java	2019-08-27 17:27:17.542324386 -0700
@@ -37,6 +37,7 @@
  * @since   1.0
  */
 public class IllegalThreadStateException extends IllegalArgumentException {
+    @java.io.Serial
     private static final long serialVersionUID = -7626246362397460174L;
 
     /**