I need to specialize in spring -hibernate framework, especially for Web Apps

Gurus, My dream is to specialise and become expert in spring framework. I am newbie to spring mvc, and I can now write a simple CRUD web App(one mysql table) in spring mvc- hibernate. what further topics should I now engage/learn? and which sites offer good tutorials in them. my conscious had suggested JMS, MAIL, SECURITY etc...

what is your take guys.