src/java.base/share/classes/jdk/internal/reflect/Reflection.java

*** 1,7 ****
  /*
!  * Copyright (c) 2001, 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) 2001, 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
*** 120,129 ****
--- 120,132 ----
      public static boolean verifyMemberAccess(Class<?> currentClass,
                                               Class<?> memberClass,
                                               Class<?> targetClass,
                                               int modifiers)
      {
+         Objects.requireNonNull(currentClass);
+         Objects.requireNonNull(memberClass);
+ 
          if (currentClass == memberClass) {
              // Always succeeds
              return true;
          }
  
*** 325,334 ****
--- 328,340 ----
                                                                     Class<?> memberClass,
                                                                     Class<?> targetClass,
                                                                     int modifiers)
          throws IllegalAccessException
      {
+         if (currentClass == null)
+             return newIllegalAccessException(memberClass, modifiers);
+ 
          String currentSuffix = "";
          String memberSuffix = "";
          Module m1 = currentClass.getModule();
          if (m1.isNamed())
              currentSuffix = " (in " + m1 + ")";
*** 354,363 ****
--- 360,400 ----
  
          return new IllegalAccessException(msg);
      }
  
      /**
+      * Returns an IllegalAccessException with an exception message where
+      * there is no caller frame.
+      */
+     public static IllegalAccessException newIllegalAccessException(Class<?> memberClass,
+                                                                    int modifiers)
+         throws IllegalAccessException
+     {
+         String memberSuffix = "";
+         Module m2 = memberClass.getModule();
+         if (m2.isNamed())
+             memberSuffix = " (in " + m2 + ")";
+ 
+         String memberPackageName = memberClass.getPackageName();
+ 
+         String msg = "JNI attached native thread (null caller frame) cannot access ";
+         if (m2.isExported(memberPackageName)) {
+ 
+             // module access okay so include the modifiers in the message
+             msg += "a member of " + memberClass + memberSuffix +
+                 " with modifiers \"" + Modifier.toString(modifiers) + "\"";
+ 
+         } else {
+             // module access failed
+             msg += memberClass + memberSuffix+ " because "
+                 + m2 + " does not export " + memberPackageName;
+         }
+ 
+         return new IllegalAccessException(msg);
+     }
+ 
+     /**
       * Returns true if {@code currentClass} and {@code memberClass}
       * are nestmates - that is, if they have the same nesthost as
       * determined by the VM.
       */
      public static native boolean areNestMates(Class<?> currentClass,