Ok just a quick update. Adding spring declarative transaction did the trick. I was now able to add a new user account through the a web form -> Spring Controller -> EntityManager and it shows up in my user list for testing purposes. I'm still gonna finish reading the Spring Transaction chapter and then I think I can finally start working on my domain model and then move on to the Controllers and views.
By the way. Annotation-based Spring MVC seems pretty good. There is a great deal of flexibility both in terms of what types of input your controller methods can take and what output they can return. Spring basically reads your thoughts and figures out what you wanted to do. Well not really, but it's very flexible. It almost feels a bit un-Java-like. Spring MVC with annotations basically fulfills the requirements that made me search for a rest-framework without the rest parts that I don't really care too much about when making a human-facing web application (such as content negotiation regarding different input and output formats, like json and xml.)
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