Thanks Kris, so changes to this AuditLog.hbm.xml file for Date column worked!
So how doI make sure that I've latest source of jbpm5,because we are changing and fixing some issues,so can I take the source now with all the changes related to host,port and this Oracle issue from - https://hudson.jboss.org/hudson/job/jBPM5/lastSuccessfulBuild/artifact/target/
Thanks,
Anand