It may be helpful for you to post your
jsp code as well (assuming you are using jsp).
If using getUsuario() is working, then it would appear that the problem may be the way you are referencing your object in your jsp.
My guess is that you have something like this in your jsp:
This would work with getUsuario(), but this will not work with getModel(). The reason is that the model object is placed on the top of the ValueStack. So to reference it in your jsp, you would do this:
As a side note, you really shouldn't access the request in the manner that you are using. Instead,
you should have your action implement the ServletRequestAware interface.