Flex Data to PDF and Back



I would like to have my flex app send data to a pdf form
(then back again). I've seen mention of XPAAJ but can't seem to
locate the library XPAAJ.jar anywhere...where is this? No longer
available? Is there an alternate way of sending data to PDF, then
back to Flex again?

We own Acrobat 9 Pro Extended. I am on Linux Oracle app
server and looking to use java.

Any ideas are appreciated...