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While having fun implementing a checkbox tree for categories, I realized that I needed to access a spring service from outside of the Wicket Page/Component, from some Model classes that were being used to retrieve data for the tree.
 
I added the following to my RootTreeNode, but alas, my bean did not get set.  I suspect that this annotation only works for Wicket pages/components.
    @SpringBean(name = "categoryService")    protected CategoryService categoryService;
Alas, how can I get to my spring bean while deep in my tree model?  I read through the docs on wicket/spring, and the main gem that I found was to not hold a reference to my spring bean from inside my components.  If my model classes are serialized with my component, I would not want to hold a reference to my bean inside the model.
I decided what I am going to do, I am going to pass a reference from my component to the model.  If the model needs a spring bean, it can refer back to the component to get it.  This way, I don't hold references to the spring bean.