Migrate from acegisecurity to spring-security 2.0.x

I need to update the security module in an application that is using the old acegisecurity.
The objective is to upgrade to spring-security 3.x taking small steps and the first step is from acegisecurity to spring-security 2.0.7
Is there any documentation regarding such an upgrade? I am looking in particular for documentation pertaining to the method and domain authorization. Something that would help me migrate the deprecated Acl classes to the new acl module.