org.springframework.validation.BeanPropertyBindingResult: 1 errors Field error in object 'gameUrlRequest' on field 'token': rejected value [null]; codes [NotEmpty.gameUrlRequest.token,NotEmpty.token,NotEmpty.java.lang.String,NotEmpty]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [gameUrlRequest.token,token]; arguments []; default message [token]]; default message [must not be empty]