Run the target nofork-stdin from the attached Ant
script. You are prompted for input. Send some
lines, then close the input field to end the
process. Now run the same target again. It will
display an immediate EOF. If you run some other
target, then go back to this one, it will work again.

Problem is that the Ant module tries to reuse the
output tab whenever it can, and does its best to
reset it using

io.getOut().reset();
io.getErr().reset();

This works for output but it does not reset the
state of standard input, which is still marked
internally as closed.

NbIO.reset() should be being called here (by both
of the above lines), and this should be calling
in.reuse(), which should have the desired effect.
But apparently something is not working. Maybe
dispose() is being called first?