MagicPermission not granted for type: org.jnode.driver.system.acpi.AcpiTable

I get the following message during boot:

MagicPermission not granted for type: org.jnode.driver.system.acpi.AcpiTable

What does that mean? is it a bug?

Will be a bug

At the moment we can ignore this message. Sometime in the future this will trigger an exception. If you build JNode you can see many of them. It basicaly means, that AcpiTable may use special methods that are "magic" as they can bypass the type system.
Afair it could be fixed with a simple annotation to AcpiTable, but this will probably be done in a huge security "rework".