I'm using Jboss 2.44 and Oracle 8.1.7. I have configured Jboss to run with Oracle, and it seems to be OK as long as I use standard JDBC calls. When I try to use Oracle Specific extensions to JDBC I have an error "TRANSACTION ROLLBACK EXCEPTION" which I think is because JBoss does not understand Oracle specific calls (classes12.zip). What should I do use those extensions? Should I add somewhere in configuration reference to classes12.zip from Oracle?