duraace,
Let us continue to work with this exception using the other thread that you started.
Something that is key to understanding how ME works in the development process is when you deploy a project, it copies out the project to your application server, there is no longer a link between ME and JBoss. So your post should actually be “Where does JBoss look for Oracle DB Driver?” in which case another user or the JBoss forums can help you the best with that question.
I will continue to help you troubleshootin the other thread, let’s see if we can’t duplicate your work environment at home first.