Validation of string array for DynaValidatorForm

I'd like to do this: Check if a user has selected at least one item in a multi select drop down. And I'd like to use the Struts Validator for this. I use v. 1.1 RC. If I have an old standard Struts ActionForm bean where this drop down is implemented as a String array, then validation 'required'

Two articles about Struts

Some of you might be interested in knowing that I have published two new articles about Struts on www.javaboutique.com: Stepping through Jakarta Struts: http://javaboutique.internet.com/tutorials/Struts/ Coding your second Jakarta Struts Application: http://javaboutique.internet.com/tutorials/St