Problemas com EJB

30 de junho de 2012 5 respostas

BLV_DOOM_JAVA 30 de junho de 2012

Oi pessoal!

Eu estou estudando EJB pela apostila do curso FJ31 da Caelum…
Estou no exercicio do capitulo 7 - Aplicação Servidora e cliente…

Fiz o exercicio conforme descrito na apostila e estou tomando esse erro:

Exception in thread "main" javax.ejb.EJBException: java.lang.NullPointerException at org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:63) at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83) at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:95) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateful.StatefulInstanceInterceptor.invoke(StatefulInstanceInterceptor.java:83) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77) at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:110) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateful.StatefulContainer.dynamicInvoke(StatefulContainer.java:335) at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106) at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82) at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:809) at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:608) at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:406) at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:173) at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:163) at org.jboss.remoting.Client.invoke(Client.java:1634) at org.jboss.remoting.Client.invoke(Client.java:548) at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:62) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:67) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:53) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateful.StatefulRemoteProxy.invoke(StatefulRemoteProxy.java:139) at $Proxy1.addLivro(Unknown Source) at ClienteCarrinho.main(ClienteCarrinho.java:18) at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:74) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:67) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:53) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateful.StatefulRemoteProxy.invoke(StatefulRemoteProxy.java:139) at $Proxy1.addLivro(Unknown Source) at ClienteCarrinho.main(ClienteCarrinho.java:18) Caused by: java.lang.NullPointerException at br.com.caelum.loja.session.CarrinhoBean.addLivro(CarrinhoBean.java:18) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112) at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166) at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.entity.ExtendedPersistenceContextPropagationInterceptor.invoke(ExtendedPersistenceContextPropagationInterceptor.java:57) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79) at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:95) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateful.StatefulInstanceInterceptor.invoke(StatefulInstanceInterceptor.java:83) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77) at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:110) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateful.StatefulContainer.dynamicInvoke(StatefulContainer.java:335) at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106) at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82) at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:809) at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:608) at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:406) at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:173)

Alguém sabe o que pode ser?

Obrigado.

5 Respostas

ErickRAR 30 de jun. de 2012

Caused by: java.lang.NullPointerException  
    at br.com.caelum.loja.session.CarrinhoBean.addLivro(CarrinhoBean.java:18)

Você está utilizando algo nesta linha que não está instanciado. Sempre que for utilizar um objeto, ele precisa estar instanciado antes, ou dará [color=red]NullPointerException[/color].

caio_ferreira 30 de jun. de 2012

Deve estar faltando a anotação @EJB no declaração da variável CarrinhoBean, ou a anotação do bean (@Stateful ou @Stateless) na classe CarrinhoBean.

BLV_DOOM_JAVA 30 de jun. de 2012

caio_ferreira:
Deve estar faltando a anotação @EJB no declaração da variável CarrinhoBean, ou a anotação do bean (@Stateful ou @Stateless) na classe CarrinhoBean.

Eis como estão minhas classes...
Realmente não sei o que esta errado...

package br.com.caelum.loja.entity;

import java.io.Serializable;

public class Livro implements Serializable {
	
	private static final long serialVersionUID = 1L;
	
	private String nome;
	private double preco;
	
	public String getNome() {
		return nome;
	}
	public void setNome(String nome) {
		this.nome = nome;
	}
	public double getPreco() {
		return preco;
	}
	public void setPreco(double preco) {
		this.preco = preco;
	}
	
	@Override
	public String toString() {
		return "Livro [nome=" + nome + ", preco=" + preco + "]";
	}

}

package br.com.caelum.loja.session;

import java.util.List;

import br.com.caelum.loja.entity.Livro;

public interface Carrinho {
	
	void addLivro(Livro livro);
	List<Livro> getLivros();
	double getTotal();
	void finalizaCompra();

}

package br.com.caelum.loja.session;


import java.util.List;

import javax.ejb.Remote;
import javax.ejb.Stateful;

import br.com.caelum.loja.entity.Livro;

@Stateful
@Remote(Carrinho.class)
public class CarrinhoBean implements Carrinho {
	
	private List<Livro> livros;
	private double total = 10.0;

	public void addLivro(Livro livro) {
		System.out.println(livro);
		this.livros.add(livro);
		this.total += livro.getPreco();
		
		// apenas para ver alguma saída no "JBoss"
		System.out.printf("Livro %s adicionado com sucesso!", livro.getNome());
	}

	public List<Livro> getLivros() {
		return this.livros;
	}

	public double getTotal() {
		return this.total;
	}

	public void finalizaCompra() {
		for (Livro livro : this.livros) {
			System.out.println("Comprando livro: " + livro);
		}
	}

}

import javax.naming.InitialContext;
import javax.naming.NamingException;

import br.com.caelum.loja.entity.Livro;
import br.com.caelum.loja.session.Carrinho;


public class ClienteCarrinho {
	
	public static void main(String[] args) throws NamingException {
		InitialContext ic = new InitialContext();
		Carrinho carrinho = (Carrinho) ic.lookup("fj31-loja-ear/CarrinhoBean/remote");
		
		if(carrinho == null) {
			System.out.println("Esta nulo");
		} else {
			System.out.println("não esta nulo");
			System.out.println(carrinho.getTotal());
		}
		
		Livro livro1 = new Livro();
		livro1.setNome("Fausto");
		livro1.setPreco(45);
		
		System.out.println(livro1);
		
		System.out.println("Entrando do método.");
		carrinho.addLivro(livro1);
		System.out.println("Saindo do método.");
		
		Livro livro2 = new Livro();
		livro2.setNome("Pais e Filhos");
		livro2.setPreco(25);
		
		carrinho.addLivro(livro2);
		
		System.out.println("Total: " + carrinho.getTotal());
		
		carrinho.finalizaCompra();
	}
}

jndi.properties

java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.provider.url=jnp://localhost:1099

Rodando o projeto eu tenho isso aqui:

não esta nulo
10.0
Livro [nome=Fausto, preco=45.0]
Entrando do método.
Exception in thread "main" javax.ejb.EJBException: java.lang.NullPointerException
	at org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:63)
	at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83)
	at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:95)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.stateful.StatefulInstanceInterceptor.invoke(StatefulInstanceInterceptor.java:83)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)
	at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:110)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.stateful.StatefulContainer.dynamicInvoke(StatefulContainer.java:335)
	at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)
	at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
	at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:809)
	at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:608)
	at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:406)
	at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:173)
	at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:163)
	at org.jboss.remoting.Client.invoke(Client.java:1634)
	at org.jboss.remoting.Client.invoke(Client.java:548)
	at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:62)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:67)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:53)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.stateful.StatefulRemoteProxy.invoke(StatefulRemoteProxy.java:139)
	at $Proxy1.addLivro(Unknown Source)
	at ClienteCarrinho.main(ClienteCarrinho.java:28)
	at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:74)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:67)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:53)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.stateful.StatefulRemoteProxy.invoke(StatefulRemoteProxy.java:139)
	at $Proxy1.addLivro(Unknown Source)
	at ClienteCarrinho.main(ClienteCarrinho.java:28)
Caused by: java.lang.NullPointerException
	at br.com.caelum.loja.session.CarrinhoBean.addLivro(CarrinhoBean.java:20)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
	at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
	at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.entity.ExtendedPersistenceContextPropagationInterceptor.invoke(ExtendedPersistenceContextPropagationInterceptor.java:57)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
	at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:95)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.stateful.StatefulInstanceInterceptor.invoke(StatefulInstanceInterceptor.java:83)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)
	at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:110)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
	at org.jboss.ejb3.stateful.StatefulContainer.dynamicInvoke(StatefulContainer.java:335)
	at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)
	at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
	at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:809)
	at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:608)
	at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:406)
	at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:173)

Por que?
Não sei o que ocorre.

Peço ajuda de vocês.

ErickRAR 30 de jun. de 2012

O erro está quando você faz isso:

carrinho.addLivro(livro1);

Você tem um array em sua classe carrinhoBean que não está instanciado. Você tem que instanciar a lista também:

List<Livro> livros = new ArrayList<Livros>();

Depois disso poderá adicionar os livros sem problema.

BLV_DOOM_JAVA 30 de jun. de 2012

ErickRAR:
O erro está quando você faz isso:
carrinho.addLivro(livro1);
Você tem um array em sua classe carrinhoBean que não está instanciado. Você tem que instanciar a lista também:
List<Livro> livros = new ArrayList<Livros>();
Depois disso poderá adicionar os livros sem problema.

Cara…fiquei até com vergonha agora.
Vlw mesmo…

Olhei um monte de coisa e não vi isso.

Vlw…problema resolvido.

To aprendendo EJB agora, mas isso é Java basico…que vergonha.

Vlw mesmo.

Criado 30 de junho de 2012

Ultima resposta 30 de jun. de 2012

Respostas 5

Participantes 3

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