Anne, you need to override the validate method
provided in ActionForm. It would look something like
this:

In your form bean...
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionError;
                      |
                      |
                      |
public ActionErrors validate(ActionMapping mapping,
    HttpServletRequest request)
{
 ActionErrors errors = new ActionErrors();
 if ((user == null) || (user.length() < 1))
 {      
   errors.add("username", 
   new ActionError ("error.username.required"));
   errors.add("header", 
   new ActionError  ("errors.header")); 
 }
 return errors; 
}
regards,
sanjay    

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