Message872

If you try to import a module that does not exist,
Jython will return an import error (as expected).  But
if you then create that module and try again without
restarting Jython, you get the same error (CPython will
allow this).  In order to get that module Jython must
be restarted.  This can be an annoyance when using the
interactive session, and can be a complete pain when
using something like STAX which keeps Jython running in
the background to make requests to.