--- old/src/java.base/share/classes/java/lang/reflect/AccessibleObject.java	2018-05-01 00:23:02.000000000 +0800
+++ new/src/java.base/share/classes/java/lang/reflect/AccessibleObject.java	2018-05-01 00:23:02.000000000 +0800
@@ -566,7 +566,6 @@
         throw new AssertionError("All subclasses should override this method");
     }
 
-
     // Shared access checking logic.
 
     // For non-public members or members in package-private classes,
@@ -676,4 +675,13 @@
         }
         return printStackWhenAccessFails;
     }
+
+    /**
+     * Returns the root AccessibleObject; or null if this object is the root.
+     *
+     * All subclasses override this method.
+     */
+    AccessibleObject getRoot() {
+        throw new InternalError();
+    }
 }