在ajax请求中使用'post'时获取500内部服务器

I am working with JSP and ajax using jquery in my sample project. I am sending json data from client to server and in response I am getting another json from server. Everything works fine if I use 'get' method. If I use 'post' then I am getting 500 Internal server error. My sample client side code is I am working with JSP and ajax using jquery in