It is essential that you implement the
ActionForm's reset() method. In this method, you must set the fields that populate the checkboxes to false. The reason is that an HTTP request only includes values for selected checkboxes. Any de-selected box will not be a part of the request and so the server-side will be none the wiser that a user un-checked a box.
An important side note (one that cost me quite a while): The
reset() method is overloaded with the following variants
void reset(ActionMapping mapping, ServletRequest request)
and
void reset(ActionMapping mapping, HttpServletRequest request)
For a web UI, you need to implement the latter. If you use your IDE's intellisense, it is easy to accidentally pick the former since it shows up first in the list of choices.
