Mock controller with an Object Parameter

[Alex Giovi]

I'm trying to test a Method with this signature:

@RequestMapping(value="/Employee/{id}", method=RequestMethod.PUT, consumes="application/json") 
    @Transactional
  public @ResponseBody Map update(@PathVariable Integer id, @RequestBody HashMap<String, Object>   information){

    }

the problem is that MockMvc param attributes accept only String parameters, is there a way to pass a HashMap , or an instance class object to the RequestBody as parameter? When i try to pass a hashMap as a string ,i get a MismatchException?

Any Help will be appreciated?