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

*** 1,7 ****
  /*
!  * Copyright (c) 1997, 2018, 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
--- 1,7 ----
  /*
!  * 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
*** 668,677 ****
--- 668,685 ----
  
      // 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;
          }