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public String ServiceLogon(String user, String pwd) throws ServiceException  
    {  
        String url="http://localhost/WebServices/Service.asmx";  
        Service service = new Service();  
        Call call = (Call)service.createCall();  
        //We have to figure our the namespace. The java doesn't know where is the namespace  
        call.setOperationName(new QName("http://localhost/WebServices/Service.asmx","Logon"));  
          
        call.addParameter(new QName("http://localhost/WebServices/Service.asmx","username"),XMLType.XSD_STRING, javax.xml.rpc.ParameterMode.IN);  
        call.addParameter(new QName("http://localhost/WebServices/Service.asmx","password"),XMLType.XSD_STRING, javax.xml.rpc.ParameterMode.IN);  
        String res = "";  
        try {  
            call.setTargetEndpointAddress(new URL("http://localhost/WebServices/Service.asmx"));  
            res = (String)call.invoke(new Object[]{user,pwd});   
        } catch (MalformedURLException e) {  
            // TODO Auto-generated catch block  
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