--- old/src/java.base/share/classes/java/io/UncheckedIOException.java	2019-08-27 17:26:58.002324386 -0700
+++ new/src/java.base/share/classes/java/io/UncheckedIOException.java	2019-08-27 17:26:57.794324386 -0700
@@ -32,6 +32,7 @@
  * @since   1.8
  */
 public class UncheckedIOException extends RuntimeException {
+    @java.io.Serial
     private static final long serialVersionUID = -8134305061645241065L;
 
     /**
@@ -79,6 +80,7 @@
      *          if the object is invalid or has a cause that is not
      *          an {@code IOException}
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream s)
         throws IOException, ClassNotFoundException
     {