I have an Oracle table with multipoints (SDO_GTYPE 2005). When asking Geoserver for a GetFeature request, I get the following WARNING:
594187 [WARNING] org.geotools.data.oracle.sdo.SDO - Could not create MultiPoint with INTERPRETATION 1 - representing the number of points
No geometries come out in the resulting GML because of this.
I am using Geoserver 1.3 RC4 with the gt2main and gt2oracle-spatial jars sent by Hans-Ulrich Otto which contained the mutli-polygon fix and the connection not being closed fix.