On Thu, Apr 21, 2011 at 1:42 PM, David Eisner <deisner@gmail.com> wrote:
On Thu, Apr 21, 2011 at 4:33 PM, Philip Jenvey <pjenvey@underboss.org> wrote:
> It probably hasn't actually hanged, it may just be that the prompt isn't showing up (because interactive mode wasn't detected correctly).
>
> Try running the jython script (for unix platforms) instead of jython.bat, it should have a workaround for this issue. Maybe the .bat file should too but I'm not sure about that.
>

Actually, I am running the jython bash script in cygwin (see previous
message). I'm only running jython.bat in a Windows cmd shell, where
everything works.  But you're absolutely correct: it isn't hanging,
it's just not showing the prompt, or my input.  If I type '1+1<enter>'
and '7*7<enter>', I see Jython's output, but nothing else:

--snip--
$ head -3 `which jython`
#!/usr/bin/env bash

# This file was generated by the Jython installer

$ jython
2
49
--snip--

So now the question is, why isn't it echoing the prompt, or my input?

Some Windows applications do console I/O by writing to video RAM directly, instead of *ix's more disciplined approach - which some Windows applications use instead.

Presumably, Jython is one of those that writes directly to video RAM.  For these, you're pretty much stuck with cmd.exe or similar.