I am new to Spring. I display a list with users. Every row has a checkbox for removing the users.
Controller:
@Controller
public class AdminControlle
Your ModelAttribute is empty as there is no form data binding happening from your jsp to your model attribute. Take a look at how Spring sample for binding collections "http://developer.ucsd.edu/develop/user-interface/building-a-form/form-binding-with-collections.html". This will help you to understand.
Most of the Spring application typically uses form:input with "path" parameter to do data binding.