Discussoes de Programacao e Tecnologia

Problema serialização vraptor 3.4.0

5 respostas
boneazul
boneazul

Estou com um problema estranho de referência circular ao tentar serializar um json com o vraptor 3.4.0

minhas classes do hibernate são

Projeto.java

@Entity
@Table(name = "oog_projeto")
public class Projeto implements IModel{

	@Id
	@GeneratedValue
	@Column(name = "pro_id")
	private Long id;
        
        .
        .
        .

	@OneToMany(fetch = FetchType.LAZY)
	@BatchSize(size = 50)
	@JoinColumn(name = "pro_id", updatable = false)
	private List<Classe> classes;
	

	//getters and setters
	
	
}

Classe.java

@Entity
@Table(name = "oog_classe")
public class Classe implements IModel{

	@Id
	@GeneratedValue
	@Column(name = "clp_id")
	private Long id;
      
        .
        .
        .

	@ManyToOne(fetch = FetchType.LAZY)
	@JoinColumn(name = "pro_id")
	private Projeto projeto;

        //getters and setters

}

Quando tento usar o código :

this.result.use(Results.json()).from(this.repositoryProjeto.listAll(usuario)).
		include("classes").serialize();

a seguinte exceção de referencia circular é lançada :

17:33:59,427  br.com.caelum.vraptor.InterceptionException: exception raised, check root cause for details: com.thoughtworks.xstream.core.TreeMarshaller$CircularReferenceException: 
	at br.com.caelum.vraptor.interceptor.ExecuteMethodInterceptor.intercept(ExecuteMethodInterceptor.java:96)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:61)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:61)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.jslsolucoes.oogenerator.interceptor.MenuInterceptor.intercept(MenuInterceptor.java:45)
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:59)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:61)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.jslsolucoes.oogenerator.interceptor.SessionFixationInterceptor.intercept(SessionFixationInterceptor.java:46)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:61)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.jslsolucoes.oogenerator.interceptor.AuthenticationInterceptor.intercept(AuthenticationInterceptor.java:37)
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:59)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:61)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.jslsolucoes.oogenerator.interceptor.ErrorInterceptor.intercept(ErrorInterceptor.java:53)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.interceptor.InstantiateInterceptor.intercept(InstantiateInterceptor.java:48)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor.intercept(ExceptionHandlerInterceptor.java:71)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:56)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:83)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.core.LazyInterceptorHandler.execute(LazyInterceptorHandler.java:61)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.util.hibernate.HibernateTransactionInterceptor.intercept(HibernateTransactionInterceptor.java:48)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.interceptor.ResourceLookupInterceptor.intercept(ResourceLookupInterceptor.java:69)
	at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
	at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:54)
	at br.com.caelum.vraptor.core.EnhancedRequestExecution.execute(EnhancedRequestExecution.java:44)
	at br.com.caelum.vraptor.VRaptor$1.insideRequest(VRaptor.java:92)
	at br.com.caelum.vraptor.ioc.guice.GuiceProvider.provideForRequest(GuiceProvider.java:81)
	at br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:89)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:304)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)
Caused by: com.thoughtworks.xstream.core.TreeMarshaller$CircularReferenceException: 
	at com.thoughtworks.xstream.core.TreeMarshaller.convert(TreeMarshaller.java:83)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshallField(AbstractReflectionConverter.java:157)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.writeField(AbstractReflectionConverter.java:148)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.visit(AbstractReflectionConverter.java:118)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:129)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doMarshal(AbstractReflectionConverter.java:100)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:58)
	at com.thoughtworks.xstream.core.TreeMarshaller.convert(TreeMarshaller.java:86)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshallField(AbstractReflectionConverter.java:157)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.writeField(AbstractReflectionConverter.java:148)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.visit(AbstractReflectionConverter.java:118)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:129)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doMarshal(AbstractReflectionConverter.java:100)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:58)
	at com.thoughtworks.xstream.core.TreeMarshaller.convert(TreeMarshaller.java:86)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)
	at com.thoughtworks.xstream.converters.collections.CollectionConverter.marshal(CollectionConverter.java:55)
	at com.thoughtworks.xstream.core.TreeMarshaller.convert(TreeMarshaller.java:86)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
	at com.thoughtworks.xstream.core.TreeMarshaller.start(TreeMarshaller.java:98)
	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.marshal(AbstractTreeMarshallingStrategy.java:38)
	at com.thoughtworks.xstream.XStream.marshal(XStream.java:837)
	at com.thoughtworks.xstream.XStream.marshal(XStream.java:826)
	at com.thoughtworks.xstream.XStream.toXML(XStream.java:801)
	at br.com.caelum.vraptor.serialization.xstream.XStreamSerializer.serialize(XStreamSerializer.java:259)
	at br.com.jslsolucoes.oogenerator.controller.ProjetoController.list(ProjetoController.java:69)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at br.com.caelum.vraptor.interceptor.ExecuteMethodInterceptor.intercept(ExecuteMethodInterceptor.java:61)
	... 63 more
 {<br/> _format : json,}

e o json gerado para pela metade :

{"list": [{"id": 4,.......,"classes": [false,{"@class": "projeto"

Isso é bug ?? Ou tem algum modo de resolver isso sem precisar fazer o jsp na mão que fica meio feinho ??

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5 Respostas

yorgan
yorgan

Seu problema é com o XStream, que está gerando uma CircularReferenceException.
Essa é uma issue bastante discutida.
Veja se isso ajuda: http://www.wbotelhos.com.br/2010/08/26/vraptor-3-evitando-circularreferenceexception-do-xstream/

[]'s
Daniel

boneazul
boneazul

yorgan:
Seu problema é com o XStream, que está gerando uma CircularReferenceException.
Essa é uma issue bastante discutida.
Veja se isso ajuda: http://www.wbotelhos.com.br/2010/08/26/vraptor-3-evitando-circularreferenceexception-do-xstream/

[]'s
Daniel

Mas pelo que vi no final do artigo foi falado que isso foi arrumado no 3.1.3 ?? Estou usando a versao 3.4.0 e o problema continua ?? Copiando o componente do site funcionou agora , mas isso não deveria ser arrumado no próprio core ??

boneazul
boneazul

Bom tem um jeito melhor de se fazer nesse caso que eu acabei encontrando :

package br.com.jslsolucoes.oogenerator.serialization.json;

import java.util.Collection;

import br.com.caelum.vraptor.ioc.Component;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.converters.collections.CollectionConverter;

@Component
public class PersistentBagConverter extends CollectionConverter {
	public PersistentBagConverter() {
		super(new XStream().getMapper());
	}

	@Override
	@SuppressWarnings("rawtypes")
	public boolean canConvert(Class type) {
		return Collection.class.isAssignableFrom(type);
	}
}

Isso resolve o problema para a versão 3.4.0 . Esse componente já não deveria vir junto com o o pacote br.com.caelum.vraptor.util.hibernate , pois creio que seja uma coisa que acontece muito com quem usa hibernate .

boneazul
boneazul

Humm testando melhor funcionou em partes , antigamente sem esse componente ele gerava com o objeto nativo declarado no mapeamento :

{ [b]"list"[/b] : [ ........... ] }

agora com o componente ele começou a gerar com o objeto do valor interno , no caso o PersistenceBag do hibernate :

{ [b]"persistenceBag"[/b] : [ ........... ] }

Tem como forçar o componente a continuar renderizando com o tipo do objeto declarado no mapeamento no caso “list” ?? Pois acabou quebrando um monte de componentes javascript que estava esperando como resposta : “data.list”

Lucas_Cavalcanti
Lucas_Cavalcanti

é que a classe que o hibernate retorna é um persistenceBag.

vc pode nomear o objeto na serialização, ou mudar esse converter para mudar a lista pra uma arrayList:

@Override
public void marshall(Object obj, ...) {
   super.marshall(new ArrayList((Collection)obj)), ...);

}
Criado 10 de dezembro de 2011
Ultima resposta 11 de dez. de 2011
Respostas 5
Participantes 3

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