Consumir JSON.

Dev.Softhouse

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Apr 10, 2012, 2:07:46 PM4/10/12

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Boa tarde pessoal,

Estou tentando consumir um JSON vindo de um form via POST:

{"bairro":{"id":"","nome":"ttetretretet","nomeAbreviado":"tetrtrtertertre","cidade.id":350580,"cidade.nome":"","cidade.estado.sigla":"","cidade.estado.pais.nomePais":""}}

Minha classe de modelo é um Bairro:

@XStreamAlias("bairro")

@Entity

@Table(name="tb_bairro_cidade")

public class Bairro {

private String id;

private Cidade cidade;

private String nome;

private String nomeAbreviado;

........

Já no controller deixei assim:

@Consumes //também tentei passando o parametro application/json
	@Post("/bairros")
	public void save(Bairro bairro){
		this.validator.validate(bairro);
		this.validator.onErrorSendBadRequest();
		//valida regra de negócio
		//persiste no banco
		result.use(json()).from("Bairro cadastrado com sucesso","message").serialize();
		result.nothing();
..................

Eu estou utilizando a classe que o Eric fez para tratar a desserialização:
@Component
@Deserializes({"application/json", "json", "text/javascript"})
public class CustomJSONDeserializer extends JsonDeserializer {

	public CustomJSONDeserializer(ParameterNameProvider provider,
			TypeNameExtractor extractor) {
		super(provider, extractor);
	}

	public XStream getConfiguredXStream(java.lang.reflect.Method javaMethod,
			java.lang.Class<?>[] types) {
		XStream xStream = super.getConfiguredXStream(javaMethod, types);

		for (Type type : javaMethod.getGenericParameterTypes()) {
			if (type instanceof ParameterizedType)
				xStream.processAnnotations((Class<?>) ((ParameterizedType) type)
						.getActualTypeArguments()[0]);
		}
		xStream.processAnnotations(types);

		return xStream;
	}
}


Quando eu dou um POST ele retorna um erro 500 e exibe esse erro no console (mesmo eu tendo anotado com @XStreamAlias("cidade") @XStreamAlias("estado") @XStreamAlias("pais") ):
Estou usando a versão 3.4 do vraptor + Iogi para evitar que o parametros vazios sejam setados para "".
 
14:37:33,137 DEBUG [IogiParametersProvider] IogiParametersProvider is up
14:37:33,140 DEBUG [LazyInterceptorHandler] Invoking interceptor ParametersInstantiatorInterceptor
14:37:33,140 DEBUG [ParanamerNameProvider] Found parameter names with paranamer for BairroController.save(Bairro) as [bairro]
14:37:33,140 DEBUG [IogiParametersProvider] getParametersFor() called with parameters Parameters(Parameter(total -> total), Parameter(_dc -> 1334079453101)) and targets [Target(name=bairro, type=class br.com.softhouse.siseduca.model.Bairro)].
14:37:33,142 DEBUG [ParanamerNameProvider] Found parameter names with paranamer for Bairro() as []
14:37:33,153 DEBUG [ParametersInstantiatorInterceptor] Parameter values for [DefaultResourceMethod: BairroController.saveBairroController.save(Bairro)] are [Bairro [nome=null]]
14:37:33,172 DEBUG [LazyInterceptorHandler] Invoking interceptor DeserializingInterceptor
14:37:33,187 DEBUG [ParanamerNameProvider] Found parameter names with paranamer for BairroController.save(Bairro) as [bairro]
10/04/2012 14:37:33 org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet [default] in context with path [/siseduca] threw exception
com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$UnknownFieldException: No such field br.com.model.Bairro.cidade.id
---- Debugging information ----
field               : cidade.id
class               : br.com.softhouse.siseduca.model.Bairro
required-type       : br.com.softhouse.siseduca.model.Bairro
converter-type      : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
line number         : -1
version             : null
-------------------------------
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.determineType(AbstractReflectionConverter.java:453)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:294)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:234)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1052)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1036)
	at com.thoughtworks.xstream.XStream.fromXML(XStream.java:921)
	at br.com.caelum.vraptor.deserialization.JsonDeserializer.deserialize(JsonDeserializer.java:39)
	at br.com.caelum.vraptor.interceptor.DeserializingInterceptor.intercept(DeserializingInterceptor.java:87)
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:59)

Lucas Cavalcanti

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Apr 10, 2012, 2:36:40 PM4/10/12

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vc mandou uma request com json e mesmo assim passou pelo iogi?

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Dev.Softhouse

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Apr 10, 2012, 2:49:35 PM4/10/12

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Lucas ele apareceu no log mas acho que não foi usado, porque logo em seguida apareceu:

DEBUG [LazyInterceptorHandler] Invoking interceptor ParametersInstantiatorInterceptor

Agora depois que desabilitei o Iogi continua o problema:

15:49:11,871 DEBUG [LazyInterceptorHandler] Invoking interceptor ParametersInstantiatorInterceptor

15:49:11,872 DEBUG [ParanamerNameProvider] Found parameter names with paranamer for BairroController.save(Bairro) as [bairro]

15:49:11,891 DEBUG [ParametersInstantiatorInterceptor] Parameter values for [DefaultResourceMethod: BairroController.saveBairroController.save(Bairro)] are [null]

15:49:11,934 DEBUG [LazyInterceptorHandler] Invoking interceptor DeserializingInterceptor

15:49:11,974 DEBUG [ParanamerNameProvider] Found parameter names with paranamer for BairroController.save(Bairro) as [bairro]

10/04/2012 15:49:12 org.apache.catalina.core.StandardWrapperValve invoke

GRAVE: Servlet.service() for servlet [default] in context with path [/siseduca] threw exception

com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$UnknownFieldException: No such field br.com.softhouse.siseduca.model.Bairro.cidade.id

---- Debugging information ----

field : cidade.id

class : br.com.model.Bairro

required-type : br.com.model.Bairro

converter-type : com.thoughtworks.xstream.converters.reflection.ReflectionConverter

line number : -1

version : null

-------------------------------

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Lucas Cavalcanti

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Apr 10, 2012, 3:14:17 PM4/10/12

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mas o bairro tem esse campo?

aparentemente o json tá vindo com algo assim:

{.... "cidade.id": 3 }

quando era pra vir
{..... "cidade": { "id": 3} }

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Dev.Softhouse

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Apr 10, 2012, 3:43:48 PM4/10/12

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Então, não tem, esse campo já pertence ao objeto cidade então estou fazendo certo na parte do Java? só preciso ver como corrigir isso no front-end?

Só mais uma coisa, eu estou criando alias para o Xstream desserializar os objetos e quando eu tiver que me referenciar ao mesmo objeto por alias diferentes tipo

se eu tiver no mesmo for uma cidadeNatal e uma cidadeAtual por exemplo?

Do jeito tradicional ele se guia pelo nome que dou para a instancia e nesse caso que estou fazendo agora como fica isso?

Obrigado.

Lucas Cavalcanti

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Apr 10, 2012, 4:19:14 PM4/10/12

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ele geralmente usa o alias da classe só pro objeto raiz, a partir daí é via nomes dos atributos

2012/4/10 Dev.Softhouse <sup...@softhouse.inf.br>

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Davi da Silva Nogueira

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Apr 12, 2012, 1:46:32 PM4/12/12

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Galera, estou tendo um problema parecido, ao consumir json. Tenho o seguinte codigo:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>VRaptor Blank Project</title>

$(function(){

var uri = "${linkTo[IndexController].post}";

var data = {pessoa : {nome : "Davi", idade : "27"}};

$('button').click(function(){

$.ajax({

type : "POST",

url : uri,

data : data,

contentType: "application/json",

success: function(rs) {

console.log('sucesso');

}

});

console.log(data);

});

</script>

</head>

<body>

<button>Enviar</button>

</body>

</html>

Esta dando erro que não esta conseguindo fazer o parse para json do lado do servidor, e vendo no firebug a informação que esta sendo enviada é:

pessoa%5Bnome%5D=Davi&pessoa%5Bidade%5D=27

No servidor eu tenho um metodo simples somente para testar:

        @Consumes
	@Post("/post")
	public void post(Pessoa pessoa){
		System.out.println(pessoa.getNome());
		
		result.nothing();
	}

Alguém sabe alguma coisa sobre isso, o que mais eu deveria estar fazendo?

Lucas Cavalcanti

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Apr 12, 2012, 2:02:28 PM4/12/12

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acho que o $.ajax não vai postar um json, pelo menos não desse jeito

2012/4/12 Davi da Silva Nogueira <davi...@gmail.com>

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Davi da Silva Nogueira

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Apr 12, 2012, 7:16:37 PM4/12/12

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Resolvido:

Restfulie.at(uri).as("application/json").post(data);

Suporte

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Apr 26, 2012, 8:26:13 AM4/26/12

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Bom dia pessoal.

Ainda estou tendo problema para consumir JSON, eu mudei o formato dos dados, mas mesmo assim continua dando problema. (Eu estou usando a versão 3.4.1 do VRaptor e também uma classe componente que peguei aqui na lista que lê o XStreamAlias para fazer a instanciação dos parametros).

Cabeçalho de resposta após fazer o post (no front-end setei para ele enviar o content-type application/json):

Cabeçalhos de Resposta

Connection close

Content-Type text/html;charset=utf-8

Date Thu, 26 Apr 2012 11:59:31 GMT

Server Apache-Coyote/1.1

Transfer-Encoding chunked

Cabeçalhos de Solicitação

Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Encoding gzip, deflate

Accept-Language pt-br,pt;q=0.8,en-us;q=0.5,en;q=0.3

Connection keep-alive

Content-Length 188

Content-Type application/json; charset=UTF-8

Cookie JSESSIONID=DD19DF2F750C488763B11BF383525503

Host localhost:8080

Referer http://localhost:8080/sistema/index

User-Agent Mozilla/5.0 (X11; Linux i686; rv:11.0) Gecko/20100101 Firefox/11.0

X-Requested-With XMLHttpRequest

No fire bug tem a aba postar que mostra o que estou enviando no post (esse JSON aqui está formatado para facilitar a leitura, mas no post do navegador ele manda sem formatação):

{

"bairro": {

"id": "",

"nome": "sdffsdfdds",

"nomeAbreviado": "fdsffddfdfdsfdsfsd",

"cidade": {

"id": 420005,

"nome": "ABDON BATISTA",

"estado": {

"id": 42,

"sigla": "SC",

"pais": {

"id": 10,

"nome": "BRASIL"

}

No final o Vraptor lança a exception:

08:59:31,732 DEBUG [VRaptor ] VRaptor received a new request

08:59:31,751 DEBUG [ToInstantiateInterceptorHandler] Invoking interceptor ResourceLookupInterceptor

08:59:31,751 DEBUG [DefaultResourceTranslator] trying to access /bairros

08:59:31,751 DEBUG [DefaultResourceTranslator] found resource [DefaultResourceMethod: BairroController.saveBairroController.save(Bairro)]

08:59:31,753 DEBUG [ToInstantiateInterceptorHandler] Invoking interceptor ExceptionHandlerInterceptor

08:59:31,753 DEBUG [ToInstantiateInterceptorHandler] Invoking interceptor InstantiateInterceptor

08:59:31,757 DEBUG [ToInstantiateInterceptorHandler] Invoking interceptor FlashInterceptor

08:59:31,761 DEBUG [ToInstantiateInterceptorHandler] Invoking interceptor HibernateTransactionInterceptor

08:59:31,766 DEBUG [LazyInterceptorHandler] Invoking interceptor ParametersInstantiatorInterceptor

08:59:31,767 DEBUG [ParanamerNameProvider] Found parameter names with paranamer for BairroController.save(Bairro) as [bairro]

08:59:31,767 DEBUG [ParametersInstantiatorInterceptor] Parameter values for [DefaultResourceMethod: BairroController.saveBairroController.save(Bairro)] are [null]

08:59:31,800 DEBUG [LazyInterceptorHandler] Invoking interceptor DeserializingInterceptor

08:59:31,847 DEBUG [ParanamerNameProvider] Found parameter names with paranamer for BairroController.save(Bairro) as [bairro]

08:59:31,847 DEBUG [XStreamConverters ] registered Xstream converter forbr.com.caelum.vraptor.validator.MessageConverter

08:59:31,847 DEBUG [XStreamConverters ] registered Xstream converter forbr.com.caelum.vraptor.serialization.xstream.XStreamConverters$NullConverter

26/04/2012 08:59:31 org.apache.catalina.core.StandardWrapperValve invoke

GRAVE: Servlet.service() for servlet [default] in context with path [/siseduca] threw exception

com.thoughtworks.xstream.converters.ConversionException: null : null

---- Debugging information ----

cause-exception : java.lang.NullPointerException

cause-message : null

class : br.com.dev.sis.model.Bairro

required-type : br.com.dev.sis.model.Pais

line number : -1

-------------------------------

at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:89)

at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:76)

at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:246)

at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:218)

at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:162)

at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:82)