java - Jackson ObjectMapper returning null -

i have following class:

@jsonrootname(value = "customer") @jsonignoreproperties(ignoreunknown = true) public class data{     @jsonproperty("salutation")     public string salutation;     @jsonproperty("firstname")     public string firstname;     @jsonproperty("lastname")     public string lastname;     @jsonproperty("birthdate")     public string birthdate; } 

i want transform incoming json pojo. json this:

{   "customer": {     "lastname": "test lastname",     "firstname": "test firstname",     "salutation": "test salutation",     "birthdate": "test date",     "addresses": {       "city": "test city",       "postalcode": "test postal code",       "country": "test country",       "streetnumber": "test number",       "street": "test street"     } } } 

problem: actual data not in root tag, nested in "customer". why used @jsonrootname. there data city, postalcode, in addresses, not need object instance. why added jsonignoreproperties(ignoreunknown = true).

when use:

return mapper.readvalue(getresource("/test.json"), data.class); 

it returns me instance of data, null on every attribute of it. how can fix , why doesn't work? first time using jackson mapper here.. thanks!