How to recover the value of Boolean from a REST service in Angularjs?

Question

I have a Java/Jersey service that returns a Boolean pro Angularjs. In my controller, I take the value of the return of the Promise, but it returns me an Object. In other cases, such as a return of an User entity, for example, works well, because I take the attributes of the returned object. Now when only a Boolean returns, how do I recover the value?

Below is an example I’m using:

Java service:

@POST
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
@Path("/verificaEmail")
public Boolean verificarEmail(String email){

    SimpleEntityManager simpleEntityManager = new SimpleEntityManager(persistenceUnitName);

    IUsuarioBusiness usuarioB = new UsuarioBusiness(simpleEntityManager);

    Boolean result = usuarioB.verificaEmail(email);

    return result;

}

Controller Angularjs:

this.cadastrarUsuario = function() {

  var usuario = {
    email: this.usuarioLogin.email,
    senha: this.usuarioLogin.senha,
    nome: this.usuarioLogin.nome
  }

  var verificaEmail = VerificaEmail.email(usuario.email);

  verificaEmail.$promise.then( 
    function success(result)
    {
      if (result) {
        $scope.erro = true;
        $scope.mensagemErro = "Email já existe!";
        $scope.mostraMensagem = true;
        $scope.setClasseErro();
      }
    })};

Service:

var servicoLogin = angular.module('servicoLogin', ['ngResource']);

servicoLogin.factory('VerificaEmail', ['$resource',
  function($resource){
    return $resource('http://localhost:8081/GameService/webserver/usuario/verificaEmail', {}, {
      email: {method:'POST'}
    });
  }]);

I’m only asking for help because I’ve already broken my head and I can’t solve this problem that seems to be simple.

Answer 1

Your problem seems to be the use of ngResource, this module was made to consume Restfull services, and so it seems to me that the response coming from Webservice is an object, when it receives a boolean it cannot properly treat this value and it does not get to be passed to its function.

I would say your alternatives are not to use the ngResource and request directly using $http, or else encapsulate your response in an object on the server side.

Answer 2

You can solve by placing the return in a map or in Object:

Map<String, Object> resposta = new HashMap<String, Object>();
resposta.put("resultado", Boolean.TRUE);