conditional multibox validation using validwhen

I am trying to use validwhen with html multibox in struts tag. In my JSP I am using a) A html:multibox which renders 4 check boxes for me (using iterate tag). In my ActionForm this multibox property stores values to a "String Array" property name "reasons" And b) A text field of property name

multibox validation using validwhen

I am trying to use validwhen with html multibox in struts tag. In my JSP I am using a) a html:multibox which renders 4 check boxes for me (using iterate tag). In my actionform this multibox property stores values to a "String Array" property name "reasons" and b) a text field of property name "di