SOAPMessage + JAXB

Ola pessoal,

Estou criando um cliente para acessar um webservice. Uso a IDE Netbeans com Java 6. Preciso fazer uma chamada que necessita adicionar um elemento no header da mensagem SOAP. Quando eu executo o método EfetuaLogin (mostrado no código abaixo) é gerado um erro que está descrito abaixo do código.

Eu usei o JAXB-xjc para gerar as classes de serialização dos métodos do webservice.
SDK\bin\xjc.bat -d "C:\XXX" -wsdl http://www.cvm.gov.br/webservices/Sistemas/SCW/CDocs/WsDownloadInfs.asmx?WSDL

Eu sou iniciante no mundo java. Pra falar a verdade é o meu primeiro projeto. Gostaria de saber se alguém sabe o porque do erro?

Eu já mandei a mensagem via telnet e o retorno foi o esperado, mas quando uso o método call da conexão dá o erro.

desde já agradeço.

package teste;

import br.gov.cvm.webservices.Login;
import br.gov.cvm.webservices.ObjectFactory;
import java.net.URL;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.namespace.QName;
import javax.xml.soap.MessageFactory;
import javax.xml.soap.SOAPConnection;
import javax.xml.soap.SOAPConnectionFactory;
import javax.xml.soap.SOAPElement;
import javax.xml.soap.SOAPMessage;

public class DownloadMultiplo {

    public enum EnumTipoDocumento {

        INFORME_DIARIO,
        BALANCETE;

        int value() {
            switch (this) {
                case INFORME_DIARIO:
                    return 209;
                case BALANCETE:
                    return 50;
                default:
                    return 0;
            }
        }
    }
    
    protected String guid;
    protected int idSessao;

    public DownloadMultiplo() {
        this.idSessao = 0;
        this.guid = "";
    }

    public void EfetuaLogin(int usuario, String senha) throws Exception {
        SOAPMessage mensagem = MessageFactory.newInstance().createMessage();

        SOAPElement elementoSessaiIdHeader = mensagem.getSOAPHeader().addHeaderElement(new QName("http://www.cvm.gov.br/", "sessaoIdHeader"));
        SOAPElement elementoGuid = elementoSessaiIdHeader.addChildElement("Guid");
        SOAPElement idSessaoGuid = elementoSessaiIdHeader.addChildElement("IdSessao");
        Marshaller marshaller = null;
        Login login = null;

        login = new ObjectFactory().createLogin();
        login.setINrSist(usuario);
        login.setStrSenha(senha);

        elementoGuid.addTextNode(this.guid);
        idSessaoGuid.addTextNode(Integer.toString(this.idSessao));

        marshaller = JAXBContext.newInstance(Login.class).createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        marshaller.marshal(login, mensagem.getSOAPBody());
        mensagem.saveChanges();

        mensagem.writeTo(System.out);

        SOAPConnection conexao = SOAPConnectionFactory.newInstance().createConnection();
        URL u = new URL("http://www.cvm.gov.br/webservices/Sistemas/SCW/CDocs/WsDownloadInfs.asmx");
        conexao.call(mensagem, u);
        conexao.close();
    }
}

################## ERRO #####################

init:
deps-jar:
Compiling 1 source file to C:\Documents and Settings\Michel\Meus documentos\NetBeansProjects\netfundos.core\build\classes
compile:
run:
29/06/2008 22:05:13 com.sun.xml.internal.messaging.saaj.client.p2p.HttpSOAPConnection post
SEVERE: SAAJ0010: Unable to read response
java.lang.NullPointerException
at com.sun.xml.internal.messaging.saaj.client.p2p.HttpSOAPConnection.readFully(HttpSOAPConnection.java:632)
at com.sun.xml.internal.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:379)
at com.sun.xml.internal.messaging.saaj.client.p2p.HttpSOAPConnection$PriviledgedPost.run(HttpSOAPConnection.java:169)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.xml.internal.messaging.saaj.client.p2p.HttpSOAPConnection.call(HttpSOAPConnection.java:140)
at netfundos.core.cvm.webservice.DownloadMultiplo.EfetuaLogin(DownloadMultiplo.java:108)
at Teste.main(Teste.java:26)
Exception in thread "main" com.sun.xml.internal.messaging.saaj.SOAPExceptionImpl: java.security.PrivilegedActionException: com.sun.xml.internal.messaging.saaj.SOAPExceptionImpl: Unable to read response: null
at com.sun.xml.internal.messaging.saaj.client.p2p.HttpSOAPConnection.call(HttpSOAPConnection.java:146)
at netfundos.core.cvm.webservice.DownloadMultiplo.EfetuaLogin(DownloadMultiplo.java:108)
at Teste.main(Teste.java:26)
Caused by: java.security.PrivilegedActionException: com.sun.xml.internal.messaging.saaj.SOAPExceptionImpl: Unable to read response: null
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.xml.internal.messaging.saaj.client.p2p.HttpSOAPConnection.call(HttpSOAPConnection.java:140)
... 2 more
Caused by: com.sun.xml.internal.messaging.saaj.SOAPExceptionImpl: Unable to read response: null
at com.sun.xml.internal.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:403)
at com.sun.xml.internal.messaging.saaj.client.p2p.HttpSOAPConnection$PriviledgedPost.run(HttpSOAPConnection.java:169)
... 4 more

CAUSE:

java.security.PrivilegedActionException: com.sun.xml.internal.messaging.saaj.SOAPExceptionImpl: Unable to read response: null
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.xml.internal.messaging.saaj.client.p2p.HttpSOAPConnection.call(HttpSOAPConnection.java:140)
at netfundos.core.cvm.webservice.DownloadMultiplo.EfetuaLogin(DownloadMultiplo.java:108)
at Teste.main(Teste.java:26)
Caused by: com.sun.xml.internal.messaging.saaj.SOAPExceptionImpl: Unable to read response: null
at com.sun.xml.internal.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:403)
at com.sun.xml.internal.messaging.saaj.client.p2p.HttpSOAPConnection$PriviledgedPost.run(HttpSOAPConnection.java:169)
... 4 more
Java Result: 1
CONSTRUÍDO COM SUCESSO (tempo total: 1 segundo)
####################################################################################

Estou usando o código abaixo:

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