> I am sorry to inform you but I just did and I still get the same
> Exception.

Are you able to access your database through DriverExample using
following JDBC URL?

jdbc:firebirdsql:localhost/3050:c:/Firebird_1_5/examples/employee.gdb?
sql_role_name=USER&lc_ctype=NONE

Also you can configure JayBird logging (see JayBirdWiki FAQ section)
and see what exactly is happening there.

Roman