I've successfully installed 5.0.2 on Windows with Railo 3.
http://www.chapter31.com/2008/08/16/farcry-5-running-on-railo-3-windows/
There were a couple of issues, 1 of which I believe is fixed in
"trunk" (and I listed in the post above). Apart from that there really
wasn't any other significant problems.
Are you running on Windows/Mac/Linux?
Did you have a fresh project or are you trying to use an existing
project?
Which version of farcry are you using? (5.0.0, 5.0.1 or 5.0.2)