public ActionForward execute(ActionMapping mapping,
    ActionForm form,
    HttpServletRequest request,
    HttpServletResponse response) throws Exception 
{
    // --------------------------------------------------------- Public Methods
    // See superclass for JavaDoc
        // Identify the request parameters controlling our actions
        String page = request.getParameter("page");
        String prefix = request.getParameter("prefix");
        if ((page == null) || (prefix == null)) {
            String message = messages.getMessage("switch.required");
            log.error(message);
            throw new ServletException(message);
        }
        // Switch to the requested module
        ModuleUtils.getInstance().selectModule(prefix, request, getServlet().getServletContext());
        if (request.getAttribute(Globals.MODULE_KEY) == null) {
            String message = messages.getMessage("switch.prefix", prefix);
            log.error(message);
            throw new ServletException(message);
        }
        // Forward control to the specified module-relative URI
        return (new ActionForward(page));
}