Wow. Yet another reason to completely avoid Java altogether. Just the security issues alone make this undesirable, let alone the synchronization, the memory dirtying, and the potential for deadlocking.

Yes, I understand that this is only supported for a certain set of modules, presumably ones that have been "vetted" by some authoritative group. All this means is that there's another entry to hack Java applications by replacing one of these libraries with a nefarious version. And, before you say "That can't happen", the people who designed Windows weren't stupid ...