I'm working quite happily with 9i on W2K using DBD::Oracle version 1.06, DBI version 1.14.
BTW Oracle's not 9.1, yet, just 9.0.1. :)

rdfield

updateI've done a slightly more thorough check of my config, and I'm using an 8.1.7 client to talk to the 9.0.1 database. However, PL/SQL can return ref cursors in 8i, so you can always wrap the Java in PL/SQL