Since the 1.7.5 release, every time jruby is instanciated, a new 115kb tempfile prefixed by 'JFFI' is created in the current user's %TMP%-folder and never cleaned up.
This happens on multiple machines, all running windows 7 and oracle's java7 b43 or b10.

Tested with jruby 1.7.5, 6, and 8. Doesn't occur in 1.7.3 and 1.7.4.

It occurs independently of how jruby is invoked on any launch and can lead to large disk pollution in machines that invoke jruby quite often.