java调用webservice报400错误:

第一次接触webservice，表示技术能力有限，soapui连接是正常的，搞了好久没有搞定，来求救各位大神

代码：

import java.net.MalformedURLException;

import java.net.URL;

import java.rmi.RemoteException;

import javax.xml.namespace.QName;

import javax.xml.rpc.ParameterMode;

import javax.xml.rpc.ServiceException;

import org.apache.axis.client.Call;

import org.apache.axis.client.Service;

import org.apache.axis.encoding.XMLType;

public class TestDemo {

private String userName = "userName";

private String userPass = "userPass";

public String invokeRemoteFuc() {

String url="http://www.domain.com:50000/dir/wsdl?p=sa/c56619d3ba1964c73e";

String result="noresult";

String namespace="http://www.domain.com";

Service service =new Service();

Call call;

Object[] object=new Object[1];

object[0]="testdemo";

try {

call=(Call)service.createCall();

call.setTargetEndpointAddress(new URL(url));

call.setOperationName(new QName(namespace,"SI_TASK_LIST_OUT"));

call.setUsername(userName);

call.setPassword(userPass);

// call.addHeader(new SOAPHeaderElement("Authorization","username",userName));

// call.addHeader(new SOAPHeaderElement("Authorization","password",userPass));

call.addParameter(new QName(namespace,"USER_ID"), XMLType.XSD_STRING, ParameterMode.IN);

//设置返回值类型：

call.setReturnType(XMLType.XSD_STRING); //返回值类型：String

result=(String)call.invoke(object); //远程调用

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (RemoteException e) {

e.printStackTrace();

} catch (ServiceException e) {

e.printStackTrace();

}

return result;

}

public static void main(String[] args){

Test t=new Test();

String result =t.invokeRemoteFuc();

System.out.println(result);

}

}

错误信息：