I want to set the sessionId value in the header of the Upsert operation

with the value i just got from the Login operation.

I am new in java, i don't know how to get the value to set it again in the header  

this is the my generated java code:

/**
 * SalesForceAgent_EnterpriceService.java
 *
 * This file was generated by LANSA Integrator SOAP Agent Wizard
 */
package com.marktselect.service.soap ;

public class SalesForceAgent_EnterpriceService implements com.lansa.jsm.service.SOAPAgentHandler
{

    /*
        Operation - login
    */

    public final void setOperation_LOGIN ()
    {
    }

    /*
        Operation Request - login
    */

    public final void prepareRequest_LOGIN ( com.lansa.jsm.service.SOAPAgentRequest request ) throws Exception
    {
        request.prepareParameter ( "USERNAME", java.lang.String.class, false, false ) ;
        request.prepareParameter ( "PASSWORD", java.lang.String.class, false, false ) ;
    }

    /*
        Operation Parameter - login
    */

    public final void setParameter_LOGIN_USERNAME ( com.lansa.jsm.service.SOAPAgentParameter parameter, com.lansa.jsm.service.SOAPAgentBind bind ) throws Exception
    {
        parameter.setEntity ( bind.getFieldValue ( "MSLOGUSR" ), null, null ) ;
    }

    /*
        Operation Parameter - login
    */

    public final void setParameter_LOGIN_PASSWORD ( com.lansa.jsm.service.SOAPAgentParameter parameter, com.lansa.jsm.service.SOAPAgentBind bind ) throws Exception
    {
        parameter.setEntity ( bind.getFieldValue ( "MSLOGPWD" ), null, null ) ;
    }

    /*
        Operation Response - login
    */

    public final void prepareResponse_LOGIN ( com.lansa.jsm.service.SOAPAgentResponse response ) throws Exception
    {
        response.prepareFragment ( new String[] { "LOGIN" }, com.sforce.soap.enterprise.LoginResult.class, false, true, null ) ;
        response.prepareFragment ( new String[] { "LOGIN", "USERINFO" }, com.sforce.soap.enterprise.GetUserInfoResult.class, false, true, "getUserInfo" ) ;
    }

    /*
        Operation Fragment - login
    */

    public final void getFragment_LOGIN_LOGIN ( com.lansa.jsm.service.SOAPAgentResponseFragment fragment, com.lansa.jsm.service.SOAPAgentBind bind ) throws Exception
    {
        bind.setFieldValue ( "URLSERVER", fragment.getEntity ( "metadataServerUrl", null ) ) ;
        bind.setFieldValue ( "PWEXPIRED", fragment.getEntity ( "passwordExpired", null ) ) ;
        bind.setFieldValue ( "SANDBOX", fragment.getEntity ( "sandbox", null ) ) ;
        bind.setFieldValue ( "SERVERURL", fragment.getEntity ( "serverUrl", null ) ) ;
        bind.setFieldValue ( "SESSIONID", fragment.getEntity ( "sessionId", null ) ) ;
        bind.setFieldValue ( "USERID", fragment.getEntity ( "userId", null ) ) ;
    }

    /*
        Operation Fragment - login
    */

    public final void getFragment_LOGIN_USERINFO ( com.lansa.jsm.service.SOAPAgentResponseFragment fragment, com.lansa.jsm.service.SOAPAgentBind bind ) throws Exception
    {
        bind.setFieldValue ( "ACCMODE", fragment.getEntity ( "accessibilityMode", null ) ) ;
        bind.setFieldValue ( "CURSYMBOL", fragment.getEntity ( "currencySymbol", null ) ) ;
        bind.setFieldValue ( "ORGISOCOD", fragment.getEntity ( "orgDefaultCurrencyIsoCode", null ) ) ;
        bind.setFieldValue ( "PERSACC", fragment.getEntity ( "orgHasPersonAccounts", null ) ) ;
        bind.setFieldValue ( "ORGID", fragment.getEntity ( "organizationId", null ) ) ;
        bind.setFieldValue ( "ORGMLTCUR", fragment.getEntity ( "organizationMultiCurrency", null ) ) ;
        bind.setFieldValue ( "MSBEDRNM", fragment.getEntity ( "organizationName", null ) ) ;
        bind.setFieldValue ( "MSPROFILE", fragment.getEntity ( "profileId", null ) ) ;
        bind.setFieldValue ( "ROLEID", fragment.getEntity ( "roleId", null ) ) ;
        bind.setFieldValue ( "DEFCURCOD", fragment.getEntity ( "userDefaultCurrencyIsoCode", null ) ) ;
        bind.setFieldValue ( "MSEMAIL", fragment.getEntity ( "userEmail", null ) ) ;
        bind.setFieldValue ( "MSFULLNM", fragment.getEntity ( "userFullName", null ) ) ;
        bind.setFieldValue ( "MSUSRID", fragment.getEntity ( "userId", null ) ) ;
        bind.setFieldValue ( "USERLANG", fragment.getEntity ( "userLanguage", null ) ) ;
        bind.setFieldValue ( "USERLOCAL", fragment.getEntity ( "userLocale", null ) ) ;
        bind.setFieldValue ( "USRNAME", fragment.getEntity ( "userName", null ) ) ;
        bind.setFieldValue ( "TIMEZONE", fragment.getEntity ( "userTimeZone", null ) ) ;
        bind.setFieldValue ( "MSUSRTYPE", fragment.getEntity ( "userType", null ) ) ;
        bind.setFieldValue ( "UISKIN", fragment.getEntity ( "userUiSkin", null ) ) ;
    }

    /*
        Operation Return - login
    */

    public final void getReturnParameter_LOGIN ( com.lansa.jsm.service.SOAPAgentResponse response, com.lansa.jsm.service.SOAPAgentBind bind ) throws Exception
    {
    }

    /*
        Operation Call - login
    */

    public final com.lansa.jsm.service.SOAPAgentResponse callOperation_LOGIN ( com.lansa.jsm.service.SOAPAgentRequest request, String user, String password, String url ) throws Exception
    {
        com.sforce.soap.enterprise.SforceServiceLocator locator = new com.sforce.soap.enterprise.SforceServiceLocator () ;

        String endPoint = locator.getSoapAddress () ;

        if ( url != null )
        {
            endPoint = url ;
        }

        com.sforce.soap.enterprise.SoapBindingStub stub = (com.sforce.soap.enterprise.SoapBindingStub)locator.getSoap ( new java.net.URL ( endPoint ) ) ;

        if ( user != null && password != null )
        {
            stub.setUsername ( user ) ;

            stub.setPassword ( password ) ;
        }

/*

    Add SOAP header

*/

org.apache.axis.message.SOAPHeaderElement elementHead = new org.apache.axis.message.SOAPHeaderElement ("", "SessionHeader");
 

javax.xml.soap.SOAPElement elementsessionId = elementHead.addChildElement ( "sessionId" ) ;

elementsessionId.addTextNode ( "HOW DO I GET THE SESSIONID IN HERE?" );

stub.setHeader ( elementHead ) ;

/*

   End SOAP header
*/

        request.traceStub ( stub ) ;

        return new com.lansa.jsm.service.SOAPAgentResponse ( stub.login( request.getParameterValueString ( "USERNAME" ), request.getParameterValueString ( "PASSWORD" ) ) ) ;
    }

    /*
        Operation - upsert
    */

    public final void setOperation_UPSERT ()
    {
    }

    /*
        Operation Request - upsert
    */

    public final void prepareRequest_UPSERT ( com.lansa.jsm.service.SOAPAgentRequest request ) throws Exception
    {
        request.prepareParameter ( "EXTERNALIDFIELDNAME", java.lang.String.class, false, false ) ;
        request.prepareParameter ( "SOBJECTS", com.sforce.soap.enterprise.sobject.SObject.class, true, true ) ;
        request.prepareFragment ( "SOBJECTS", new String[] { "UPSERTOBJ" }, com.sforce.soap.enterprise.sobject.SObject.class, true, true, null ) ;
        request.prepareList ( "SOBJECTS", new String[] { "UPSERTOBJ", "OBJNAME" }, java.lang.String.class, true, false, "setFieldsToNull" ) ;
    }

    /*
        Operation Parameter - upsert
    */

    public final void setParameter_UPSERT_EXTERNALIDFIELDNAME ( com.lansa.jsm.service.SOAPAgentParameter parameter,

    etc... 

this is the my generated message i sent:

<?xml version="1.0" encoding="UTF-8" ?>
- <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
- <soapenv:Header>
- <SessionHeader soapenv:actor="http://schemas.xmlsoap.org/soap/actor/next" soapenv:mustUnderstand="0">
  <sessionId>HOW DO I GET THE SESSIONID IN HERE?</sessionId>
  </SessionHeader>
  </soapenv:Header>
- <soapenv:Body>
- <upsert xmlns="urn:enterprise.soap.sforce.com">
  <externalIDFieldName>mskey__c</externalIDFieldName>
- <sObjects>
  <ns1:fieldsToNull xmlns:ns1="urn:sobject.enterprise.soap.sforce.com">34</ns1:fieldsToNull>
  <ns2:Id xmlns:ns2="urn:sobject.enterprise.soap.sforce.com">11111</ns2:Id>
  </sObjects>
  </upsert>
  </soapenv:Body>
  </soapenv:Envelope>