How can I populate a bean from the parameters of an HttpServletRequest?

I am using extjs to submit form information to a servlet. The parameters are named whatever I want, so let's say "id"="123" and "names[0]"="abc".

I want to populate a bean using that info. Let's say the bean is something like:
  class SomeBean {
    int id;
    List<String> names;
  }
I want to populate that bean by doing something like
  SomeBean bean = PopulateBean(request,new SomeBean());
so that bean.id=123 and bean.names is a list containing one entry which is "abc".

I know that I could manually do it, but I would hope that there was a general interface for this given that all the different frameworks like JSF and stripes and struts all do this sort of thing (although the old struts didn't do it very well for lists of lists of lists.).