--- old/src/java.base/share/classes/java/io/IOException.java	2019-08-27 17:26:50.134324386 -0700
+++ new/src/java.base/share/classes/java/io/IOException.java	2019-08-27 17:26:49.910324386 -0700
@@ -37,6 +37,7 @@
  */
 public
 class IOException extends Exception {
+    @java.io.Serial
     static final long serialVersionUID = 7818375828146090155L;
 
     /**