I have been trying to get our application to work on jboss 7 and everything has been working great thanks to the discussions and online documentation.

However I do have one question. With this new approach of separate module for each piece, we are needed to add explicit dependencies on required modules (apart from a few "core" modules).

I have a jdbc jar which is not JDBC 4 compliant and as per the information available online, I created a separate module for this jar. I had expected that I would have to provide this new module as a dependency in my web application. But that was never needed and the application started up fine.

Why is this JDBC dependency not needed?