On behalf of the .lrn leadership team:
.LRN 2.5.0 alpha 1 has been released but since our last calls for testing on Oracle have received no answer, we can not guarantee full support for oracle in this version.
Smoke tests have been carried out on version 9i but we're supposed to support the latest versions (i.e. 10g and 11g) and smoke tests are not enough to claim support.
This is a sad situation but unfortunately Oracle support is not possible without the commitment of the Oracle users in the .LRN community.