--- old/src/java.base/share/classes/java/lang/reflect/ReflectAccess.java	2018-05-01 00:23:14.000000000 +0800
+++ new/src/java.base/share/classes/java/lang/reflect/ReflectAccess.java	2018-05-01 00:23:13.000000000 +0800
@@ -154,4 +154,9 @@
     public <T> Constructor<T> copyConstructor(Constructor<T> arg) {
         return arg.copy();
     }
+
+    @SuppressWarnings("unchecked")
+    public <T extends AccessibleObject> T getRoot(T obj) {
+        return (T) obj.getRoot();
+    }
 }