--- old/src/java.base/share/classes/jdk/internal/reflect/ReflectionFactory.java	2018-07-19 14:08:28.000000000 -0700
+++ new/src/java.base/share/classes/jdk/internal/reflect/ReflectionFactory.java	2018-07-19 14:08:28.000000000 -0700
@@ -444,7 +444,9 @@
         Class<?> superCl = cl.getSuperclass();
         assert Serializable.class.isAssignableFrom(cl);
         assert superCl != null;
-        if (packageEquals(cl, superCl)) {
+        if (Reflection.areNestMates(cl, superCl)) {
+            return true;
+        } else if (packageEquals(cl, superCl)) {
             // accessible if any non-private constructor is found
             for (Constructor<?> ctor : superCl.getDeclaredConstructors()) {
                 if ((ctor.getModifiers() & Modifier.PRIVATE) == 0) {