--- old/src/java.base/share/classes/sun/nio/ch/Reflect.java	2019-08-27 17:29:34.906324386 -0700
+++ new/src/java.base/share/classes/sun/nio/ch/Reflect.java	2019-08-27 17:29:34.710324386 -0700
@@ -36,6 +36,7 @@
     private Reflect() { }
 
     private static class ReflectionError extends Error {
+        @java.io.Serial
         private static final long serialVersionUID = -8659519328078164097L;
         ReflectionError(Throwable x) {
             super(x);