src/java.base/share/classes/java/lang/reflect/AccessibleObject.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -668,10 +668,18 @@
 
     // Keep all this slow stuff out of line:
     private boolean slowVerifyAccess(Class<?> caller, Class<?> memberClass,
                                      Class<?> targetClass, int modifiers)
     {
+
+        if (caller == null) {
+            // No caller frame when a native thread attaches to the VM
+            // can access public member of a type in unconditional exported API packages
+            Module module = memberClass.getModule();
+            return Modifier.isPublic(modifiers) && module.isExported(memberClass.getPackageName());
+        }
+
         if (!Reflection.verifyMemberAccess(caller, memberClass, targetClass, modifiers)) {
             // access denied
             return false;
         }