spring前台传送json格式字符串到后台问题

Question

前台代码：
$.ajax({
    url : url,
    type : "POST",
    dataType : "jsonp",
    contentType : 'application/json;charset=UTF-8',
    data : {"loanApplication":loanApplication},
    success : function(msg) {
        alert("success");
    },
    error : function(e) {
        alert("error ----------");
    }
});

后台代码：
    @RequestMapping(value="/apply")
@ResponseBody
public ResultBean<LoanApplication> apply(@RequestBody LoanApplication loanApplication,ModelMap map,HttpServletRequest req,HttpServletResponse res){
    try {
        req.getParameter("loanApplication");
        req.getParameter("loanApplication[userId]");
        req.getAttribute("loanApplication");
        System.out.println("**********connect test successfully******"+loanApplication);
        log.info(loanApplication.toString());
        String key = req.getSession().getId() + CacheKey.CAPTCHA_CODE;
        getCache().remove(key);
        ResultBean<LoanApplication> resultBean = 
                (ResultBean<LoanApplication>) sendRemotePostRequest(REMOTE_SERVICE_URL,"BWF10004",loanApplication);
        return resultBean;
    } catch (Exception e) {
        log.error(e.getMessage());
    }
        return null;
}

错误描述：
 org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/octet-stream' not supported