how to check if field is exist or not in @RequestBody?

I am developing spring web application that simply accept the request data and process request. In between the request data is validated using spring validator. it works fine.

but when I am changin field name then it throws an error so I want to handle this exception. and I don't have any idea related to it.

suppose my class:

MRequest{
  private String name;
  private String description;
  // getter-setter
}

and if will send REST post request like:

{
  "name": "abc",
  "descriptio": ""
}

then it throws an exception of mismatch field of descriptio.

So i want to handle this exception, any suggestion guys.