--- old/src/java.base/share/classes/java/lang/RuntimeException.java	2019-08-27 17:27:32.914324386 -0700
+++ new/src/java.base/share/classes/java/lang/RuntimeException.java	2019-08-27 17:27:32.718324386 -0700
@@ -41,6 +41,7 @@
  * @since   1.0
  */
 public class RuntimeException extends Exception {
+    @java.io.Serial
     static final long serialVersionUID = -7034897190745766939L;
 
     /** Constructs a new runtime exception with {@code null} as its