Salesforce webservice issue with authenticating

[Naresh Talluri]

Hi

I'm trying to add Lead programatically by using SOAP webservice call in salesforce.com
i got below error could you please help me out of it?

log4j:WARN No appenders could be found for logger (org.apache.axis.i18n.ProjectResourceBundle).
log4j:WARN Please initialize the log4j system properly.

https://test.salesforce.com/services/data/v20.0/sobjects/Account/
ENDPOINT Addr : javax.xml.rpc.service.endpoint.address
AxisFault
 faultCode: {http://xml.apache.org/axis/}HTTP
 faultSubcode: 
 faultString: (400)Bad Request
 faultActor: 
 faultNode: 
 faultDetail: 
	{}:return code:  400
[{Destination URL not reset. The URL returned from login must be set "errorCode":"URL_NOT_RESET";}]
	{http://xml.apache.org/axis/}HttpErrorCode:400

Here is my code:

package com.demo;

import java.rmi.RemoteException;
import java.util.Iterator;

import javax.xml.rpc.ServiceException;

import com.sforce.soap.enterprise.AssignmentRuleHeader;
import com.sforce.soap.enterprise.LoginResult;
import com.sforce.soap.enterprise.QueryResult;
import com.sforce.soap.enterprise.SaveResult;
import com.sforce.soap.enterprise.SessionHeader;
import com.sforce.soap.enterprise.SforceServiceLocator;
import com.sforce.soap.enterprise.SoapBindingStub;
import com.sforce.soap.enterprise.fault.LoginFault;
import com.sforce.soap.enterprise.fault.UnexpectedErrorFault;
import com.sforce.soap.enterprise.sobject.Lead;
import com.sforce.soap.enterprise.sobject.SObject;

public class LeadAssignment {
	static LeadAssignment _leadAssignment;

	public static void main(String[] args) {
		_leadAssignment = new LeadAssignment();
		try {
			_leadAssignment.CreateLead();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void CreateLead() throws UnexpectedErrorFault, LoginFault,
			RemoteException, ServiceException {
		// Create the proxy binding and login
		SoapBindingStub binding = (SoapBindingStub) new SforceServiceLocator()
				.getSoap();
		binding._setProperty(SoapBindingStub.ENDPOINT_ADDRESS_PROPERTY, "https://test.salesforce.com/services/data/v20.0/sobjects/Account/");
		System.out.println("--->"+binding._getProperty(SoapBindingStub.ENDPOINT_ADDRESS_PROPERTY));
		System.out.println("ENDPOINT Addr : "+SoapBindingStub.ENDPOINT_ADDRESS_PROPERTY);
		//LoginResult lr = binding.login(USERNAME, PASSWORD+SECURITY_TOKEN);
		LoginResult lr = binding.login("[e-mail]1", "VCpass2011lQXTr4QBwnDNlpfjYYL18v3r");
		// Reset the binding to use the endpoint returned from login
		
		System.out.println("lurl :"+lr.getServerUrl());
		binding._setProperty(SoapBindingStub.ENDPOINT_ADDRESS_PROPERTY,
				lr.getServerUrl());
		// Create the session id header, and add it to the proxy binding
		SessionHeader sh = new SessionHeader();
		sh.setSessionId(lr.getSessionId());
		binding.setHeader(new SforceServiceLocator().getServiceName()
				.getNamespaceURI(), "SessionHeader", sh);
		// Create a new case and assign various properties
		Lead lead = new Lead();
		lead.setFirstName("Joe");
		lead.setLastName("Smith");
		lead.setCompany("ABC Corporation");
		lead.setLeadSource("API");
		// The lead assignment rule will assign any new leads that
		// have "API" as the LeadSource to a particular user
		// Create the assignment rule header and add it to the proxy binding

		AssignmentRuleHeader arh = new AssignmentRuleHeader();
		// In this sample we will look for a particular rule and if found
		// use the id for the lead assignment. If it is not found we will
		// instruct the call to use the current default rule. You can't use
		// both of these values together.
		QueryResult qr = binding
				.query("Select Id From AssignmentRule where Name = "
						+ "'Mass Mail Campaign' ");
		if (qr.getSize() == 0) {
			arh.setUseDefaultRule(new Boolean(true));
		} else {
			arh.setAssignmentRuleId(qr.getRecords(0).getId());
		}
		binding.setHeader(new SforceServiceLocator().getServiceName()
				.getNamespaceURI(), "AssignmentRuleHeader", arh);
		// Every operation that results in a new or updated case, will
		// use the specified rule until the header is removed from the
		// proxy binding.
		SaveResult[] sr = binding.create(new SObject[] { lead });
		for (int i = 0; i < sr.length; i++) {
			if (sr[i].isSuccess()) {
				 System.out.println("Successfully created lead with id of: " +
				 sr[i].getId().toString() + ".");
			} else {
				System.out.println("Error creating lead: "
						+ sr[i].getErrors(0).getMessage());
			}
		}
		// This call effectively removes the header, the next lead will
		// be assigned to the default lead owner. Remember to add the
		// session header back in.
		binding.clearHeaders();
		binding.setHeader(new SforceServiceLocator().getServiceName()
				.getNamespaceURI(), "SessionHeader", sh);
	}
}

thanks in advance for your help.