Checkboxes with a false value

[oceanfront]

I have a Roo generated jspx form with a checkbox as follows:
<field:checkbox disableFormBinding="true" field="isCompleteTrue" id="f_com_novexinc_orderhawk_shrink_ShrinkMaster_i sCompleteTrue" z=""/>
When the box is checked, the controller gets the request parameter as:
&isCompleteTrue=on
When it is unchecked, the parameter is missing, and I get:
Required Boolean parameter 'isCompleteTrue' is not present

How can I modify the @RequestParam("isCompleteTrue") Boolean isCompleteTrue,
in the controller parameters to make this optional?

Or, more simply put, should I not get:
&isCompleteTrue=off
when the checkbox is unchecked?

[Stefan Schmidt]

This is how your form is submitted by your browser unfortunately. Have you tried using a primitive boolean type for the field member. This should be defaulting to false in your controller.

[oceanfront]

I eventually found the solution to this elsewhere. Using @RequestParam makes this parameter required.

To handle optional parameters, you must do the following:
Add HttpServletRequest req to the parameter list for your controller method, and then, inside the method:

Boolean isCompleteTrue = null;
if (null != req.getParameter("isCompleteTrue"))
{
        isCompleteTrue = new Boolean((req.getParameter("isCompleteTrue").equals("on")) || (req.getParameter("isCompleteTrue").equals("true")));
}