Render ModelAndView manually?

I need to render ModelAndView in my controller manually in order to put it inside JSON object. If I pass the whole ModelAndView object into to JSON I开发者_StackOverflow get " no serializer found for class javassistlazyinitializer" exception because jackson can't work properly with LAZY-objects. Thank you

public class JSONView implements View {
    /**
     * Logger for this class
     */
    private static final Logger logger = Logger.getLogger(JSONView.class);

    private String contentType = "application/json";

    public void render(Map map, HttpServletRequest request, HttpServletResponse response)
        throws Exception {
    if(logger.isDebugEnabled()) {
        logger.debug("render(Map, HttpServletRequest, HttpServletResponse) - start");
    }

    JSONObject jsonObject = new JSONObject(map);
    PrintWriter writer = response.getWriter();
    writer.write(jsonObject.toString());

    if(logger.isDebugEnabled()) {
        logger.debug("render(Map, HttpServletRequest, HttpServletResponse) - end");
    }
    }

    public String getContentType() {
    return contentType;
    }

}

ModelAndView returnModelAndView = new ModelAndView(new JSONView(), model);