I'm using JBoss 3.0.4 with Sybase JConnect 4.5 talking to a Sybase ASE11.92 database.I have the same problem.
Did you solve this problem?? I have the same one. JBOSS 3.0.4 Sybase 11.92 or 12.5 JConnect 5.5 or 5.2
The warning is meaningless and I think I got rid of it in most current jboss versions.