AngularJS with Jersey JSON resource in undefined in javascript

This is weird issue I have so far. I am using jaxon backbone to do this Angularjs project.

1. java resource file

   @GET @Path("{query}")
   @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
   
   public Signature findByName(@PathParam("query") String query) {
       return dao.findById(query);
   }  
   

2. control.js file

   function SearchCtrl($rootScope,$scope,Signature) {
   
    // console.log('SearchCtrl is invoked!!!!!!');
     $scope.signature;
     $scope.searcherrormsg='';
   
     $scope.searchaction = function(barcodenum,signature) {
        signature = Signature.query({rewardcardId:barcodenum});
        $scope.signature = signature;
   
        alert("data is " + $scope.signature.name);   <=== This is UNDEFINED   
       };
   
   } 
   

3. apps.js file

   angular.module('demo', ['demo.filters', 'demo.directives','demo.services.signature']).
     config(['$routeProvider', function($routeProvider) {
   
   $routeProvider.when('/search', {templateUrl: 'partials/search.html', controller: SearchCtrl});
   $routeProvider.otherwise({redirectTo: '/search'});
   

4. service.js file

   angular.module('demo.services.signature', ['ngResource']).
   factory('Signature', function($resource){
       return $resource('api/signature/:rewardcardId', {}, {
        query: {method:'GET', params:{rewardcardId:'signature'}, isArray:false}
       });
   });
   

This is invoking database and server console is showing the following message ;

 com.sun.jersey.api.container.filter.LoggingFilter$Adapter finish
INFO: 1 * Server out-bound response
1 < 200
1 < Content-Type: application/json
1 < 
{"name":"xxx xxxx","customerid":187,"email":"[email protected]","sign":null,"barcode":"xxxx"}

And it displays return data at the HTML page properly. For example, the html page has

<p>{{signature.barcode}}

{{signature.name}}

which are displaying name and barcode properly as the above data set .

It only has an issue to get the data from the javascript that is saying undefined.

Whenever the javascript is trying to get the data from return resources from database, it is saying undefined.