In the form, you wont have the getters and setters for those fields f1, f2, ..., fn because they are dynamic fields.
If you need to access them, you could either use: Method 1 (in the dynaform)
Method 2 (NOT in the dynaform, say in Action Dispatcher)
In JSP, we dont use the dynaform, instead, we create our own view bean and put those dyna form values there and display out to JSP using Struts Taglib. Thus, when they are submitted, they appear in the form.