java和.net互相调用webservice注意事项

最后在研究GWT,需要用到.net 的webservice,网上搜了点代码,基本上问题多多.
Java要调用.net的webservice是需要一个axis的包的. 需要下载,然后引用.
引用的时候,需要注意一些小问题.
Java 端
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  
 &n