springmvc ajax request 406 in response to the error code

No reference request is transmitted using ajax foreground, background using springmvc received, appeared in the case of 406

The back-end code is as follows:

@RequestMapping("findAll")
@ResponseBody
public Object findAll(HttpServletRequest request){
    Map<String,Object> map = new HashMap<>();
    map.put("name1","333");
    return map;
}

ajax code is as follows:

$.ajax({
    type:"post",
    dataType:"json",
    url:"${pageContext.request.contextPath}/studentController/findAll",
    success:function(data){
        alert("name的值为"+data.name1)
    }
})

Analysis: When adding @ResponseBody, the request will eventually turn into a strong target return json format, there is no reason for the majority of 406 pilot jackson bag, my side is not the cause of the error plus mvc profile <mvc: annotation-driven />

Reference article: https://blog.csdn.net/weixin_40887477/article/details/81118295