public ActionErrors validate(ActionMapping mapping,    //Form
                                 HttpServletRequest request) {

        ActionErrors errors = new ActionErrors();
        if ((buddyEmail == null) || (buddyEmail.length() < 1) || (buddyEmail.indexOf("@") == -1))
            errors.add("buddyEmail",
                new ActionError("buddyEmail","error.buddyEmail.required"));       
        return errors;

    }

//resource file
error.buddyEmail.required = Error;

//JSP file
<html:errors proprity = "buddyEmail" />