Spring/Spring Security 3.0.x execution flow

Question

Hi all,
I'm currently in the process of migrating an application from Spring 2.5.6 to Spring 3.0.4 and Spring Security 3.0.2 and I was wondering if there was some kind of execution flow for both of these framework so that developpers could know what is being called before what.

For those of you who are doing this kind of migration, I can tell you that it's not a simple task that's why I was wondering if some experts, out there, in the wild, would have some references about these flow.

Thanks