> And He will program it with jdbc

Then he must use URL

jdbc:firebirdsql:oracle:<host/port>:<path/to/database>

> Runtime is enough to start with ?
> http://www.janus-software.com/runtime_dl.html

Runtime has limitation of 500 chars in PL/SQL compiler. So, if he
wants to try PL/SQL stored procedures, he needs devel license.

Roman