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Thanks for your answer!

I solved the question with another tutorial:

http://www.personati.com/artigos/web_services.pdf

//===========================================================

package web_service_teste;

import org.apache.axis.client.Call;
import org.apache.axis.client.Service;

public class web_teste
{
    public static void main(String[] args)
    {
        try
        {
            String urlWS = "http://localhost:8080/web_service/services/HelloWorld";
            Object[] params = { "ooo" };
            Service service = new Service();
            Call call = (Call) service.createCall();
            call.setOperationStyle(org.apache.axis.constants.Style.WRAPPED);
            call.setOperationUse(org.apache.axis.constants.Use.LITERAL);
            call.setTargetEndpointAddress(urlWS);
            call.setOperationName("sayHello");
            String ret = (String) call.invoke(params);
            System.out.println("Resultado: " + ret);
        }
        catch (Exception ex)
        {
            ex.printStackTrace();
        }
    }
}

//======================================================

We can not forget the jars:

axis.jar

jaxrpc.jar

commons-logging.jar

commons-discovery.jar

saaj.jar

wsdl4j.jar