public ActionForward execute(ActionMapping mapping,
    ActionForm form,
    HttpServletRequest request,
    HttpServletResponse response) throws IOException, ServletException 
{
        String action;
        HttpSession session;
        ActionErrors errors = new ActionErrors();
        try
        {
            session = request.getSession();
            // fetch action from form
            action = ((AddressForm)form).getAction();
            servlet.log("[DEBUG] AddressAction at perform(): Action ist " + action);
            // Determine what to do
            if ( action.equals("edit") )
            {
                // forward to edit formular
                return (mapping.findForward("editAddress"));
            }
            else if (action.equals("save"))
            {
                // check if an address bean exits already
                AddressBean bean = (AddressBean)session.getAttribute("address");
                if (bean == null)
                {
                    bean = new AddressBean();
                    session.setAttribute("address", bean);
                }
                // update bean with the new values submitted
                bean.setFirstname( ((AddressForm)form).getFirstname() );
                bean.setLastname( ((AddressForm)form).getLastname() );
                bean.setStreet( ((AddressForm)form).getStreet() );
                bean.setZip( ((AddressForm)form).getZip() );
                bean.setCity( ((AddressForm)form).getCity() );
                bean.setCountry( ((AddressForm)form).getCountry() );
                bean.setLanguages( ((AddressForm)form).getLanguages() );
                // forward to list
                return (mapping.findForward("showAddress"));
            }
            else
            {
                String locale = ((AddressForm)form).getLocale();
                if (locale.equals("Deutsch"))
                    session.setAttribute(Globals.LOCALE_KEY, new Locale("de", ""));
                else
                    session.setAttribute(Globals.LOCALE_KEY, new Locale("en", ""));
                // forward to edit formular
                return (mapping.findForward("showAddress"));
            }
        }
        catch (Exception e)
        {
            //errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("lo053"));
            servlet.log("[ERROR] TskAction at final catch: " + e.getMessage());
            e.printStackTrace();
        }
        // Default if everthing else fails
        return (mapping.findForward("showAddress"));
}

Handle server requests.